Elastic and proton-dissociative ρ0 photoproduction at HERA

J. Breitweg, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, M. C K Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. BruniG. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. de Pasquale, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Pesci, A. Polini, F. Ricci, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, I. Brock, K. Coböken, J. Crittenden, R. Deffner, M. Eckert, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, R. Kerger, E. Paul, M. Pfeiffer, Ch Rembser, J. Stamm, R. Wedemeyer, H. Wieber, D. S. Bailey, S. Campbell-Robson, W. N. Cottingham, B. Foster, R. Hall-Wilton, M. E. Hayes, G. P. Heath, H. F. Heath, J. D. McFall, D. Piccioni, D. G. Roff, R. J. Tapper, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, J. Y. Kim, J. H. Lee, I. T. Lim, M. Y. Pac, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, B. Mellado, J. A. Parsons, S. Ritz, S. Sampson, F. Sciulli, P. B. Straub, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, J. Figiel, K. Klimek, M. B. Przybycień, L. Zawiejski, L. Adamczyk, B. Bednarek, M. Bukowy, A. Czermak, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarebska, L. Suszycki, J. Zaja̧c, Z. Dulinński, A. Kotanński, G. Abbiendi, L. A T Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, U. Fricke, D. J. Gilkinson, C. Glasman, P. Göttlicher, T. Haas, W. Hain, D. Hasell, K. F. Johnson, M. Kasemann, W. Koch, U. Kötz, H. Kowalski, J. Labs, L. Lindemann, B. Löhr, M. Löwe, O. Mańczak, J. Milewski, T. Monteiro, J. S T Ng, D. Notz, K. Ohrenberg, I. H. Park, A. Pellegrino, F. Pelucchi, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, J. J. Ryan, A. A. Savin, U. Schneekloth, O. Schwarzer, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, A. F. Zarnecki, W. Zeuner, B. D. Burow, H. J. Grabosch, A. Meyer, S. Schlenstedt, G. Barbagli, E. Gallo, P. Pelfer, G. Anzivino, G. Maccarrone, L. Votano, A. Bamberger, S. Eisenhardt, P. Markun, T. Trefzger, S. Wölfle, J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, N. Macdonald, D. H. Saxon, L. E. Sinclair, E. Strickland, R. Waugh, I. Bohnet, N. Gendner, U. Holm, A. Meyer-Larsen, H. Salehi, K. Wick, L. K. Gladilin, D. Horstmann, D. Kçira, R. Klanner, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche, T. C. Bacon, I. Butterworth, J. E. Cole, G. Howell, B. H Y Hung, L. Lamberti, K. R. Long, D. B. Miller, N. Pavel, A. Prinias, J. K. Sedgbeer, D. Sideris, R. Walker, U. Mallik, S. M. Wang, J. T. Wu, P. Cloth, D. Filges, J. I. Fleck, T. Ishii, M. Kuze, I. Suzuki, K. Tokushuku, S. Yamada, K. Yamauchi, Y. Yamazaki, S. J. Hong, S. B. Lee, S. W. Nam, Sung Keun Park, F. Barreiro, J. P. Fernández, G. García, R. Graciani, J. M. Hernández, L. Hervás, L. Labarga, M. Martínez, J. del Peso, J. Puga, J. Terrón, J. F. de Trocóniz, F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, W. N. Murray, A. Ochs, M. Riveline, D. G. Stairs, M. St-Laurent, R. Ullmann, T. Tsurugai, V. Bashkirov, B. A. Dolgoshein, A. Stifutkin, G. L. Bashindzhagyan, P. F. Ermolov, Y. A. Golubkov, L. A. Khein, N. A. Korotkova, I. A. Korzhavina, V. A. Kuzmin, O. Y. Lukina, A. S. Proskuryakov, L. M. Shcheglova, A. N. Solomin, S. A. Zotkin, C. Bokel, M. Botje, N. Brümmer, F. Chlebana, J. Engelen, E. Koffeman, P. Kooijman, A. van Sighem, H. Tiecke, N. Tuning, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, T. Y. Ling, P. Nylander, T. A. Romanowski, H. E. Blaikley, R. J. Cashmore, A. M. Cooper-Sarkar, R. C E Devenish, J. K. Edmonds, J. Große-Knetter, N. Harnew, C. Nath, V. A. Noyes, A. Quadt, O. Ruske, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, B. Y. Oh, J. R. Okrasiński, W. S. Toothacker, J. J. Whitmore, Y. Iga, G. D'Agostini, G. Marini, A. Nigro, M. Raso, J. C. Hart, N. A. McCubbin, T. P. Shah, E. Barberis, D. Epperson, C. Heusch, J. T. Rahn, H. F W Sadrozinski, A. Seiden, R. Wichmann, D. C. Williams, H. Abramowicz, G. Briskin, S. Dagan, S. Kananov, A. Levy, T. Abe, T. Fusayasu, M. Inuzuka, K. Nagano, K. Umemori, T. Yamashita, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, V. Monaco, C. Peroni, M. C. Petrucci, M. Ruspa, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D. C. Bailey, C. P. Fagerstroem, R. Galea, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, A. Sabetfakhri, D. Simmons, R. J. Teuscher, J. M. Butterworth, C. D. Catterall, T. W. Jones, J. B. Lane, R. L. Saunders, M. R. Sutton, M. Wing, J. Ciborowski, G. Grzelak, M. Kasprzak, K. Muchorowski, R. J. Nowak, J. M. Pawlak, R. Pawlak, T. Tymieniecka, A. K. Wróblewski, J. A. Zakrzewski, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, W. F. Badgett, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, W. H. Smith, A. Vaiciulis, M. Wodarczyk, A. Deshpande, S. Dhawan, V. W. Hughes, S. Bhadra, W. R. Frisken, M. Khakzad, W. B. Schmidke

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) has been studied in ep interactions at HERA for photon-proton centre-of-mass energies in the range 50 < W < 100 GeV and for |t| < 0.5 GeV2, where t is the square of the four-momentum transfer at the proton vertex; the results on the proton-dissociative reaction are presented for masses of the dissociated proton system in the range M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 resonance shape is asymmetric; this asymmetry decreases with increasing |t|, as expected in models in which the asymmetry is ascribed to the interference of resonant and non-resonant π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (syst.) GeV-4. The t dependence has also been studied as a function of W and a value of the slope of the pomeron trajectory α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W and the polar and azimuthal angles of the pions in the helicity frame are the same within errors as those for the elastic process. The t distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).

Original languageEnglish
Pages (from-to)247-267
Number of pages21
JournalEuropean Physical Journal C
Volume2
Issue number2
Publication statusPublished - 1998 Dec 1

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photoproduction
Protons
protons
cross sections
pions
asymmetry
slopes
Momentum transfer
Exponential functions
exponential functions
mass spectra
momentum transfer
center of mass
conservation
Conservation
apexes
Photons
Trajectories
trajectories
interference

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Breitweg, J., Derrick, M., Krakauer, D., Magill, S., Mikunas, D., Musgrave, B., ... Schmidke, W. B. (1998). Elastic and proton-dissociative ρ0 photoproduction at HERA. European Physical Journal C, 2(2), 247-267.

Elastic and proton-dissociative ρ0 photoproduction at HERA. / Breitweg, J.; Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Repond, J.; Stanek, R.; Talaga, R. L.; Yoshida, R.; Zhang, H.; Mattingly, M. C K; Anselmo, F.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cara Romeo, G.; Castellini, G.; Chiarini, M.; Cifarelli, L.; Cindolo, F.; Contin, A.; Corradi, M.; de Pasquale, S.; Gialas, I.; Giusti, P.; Iacobucci, G.; Laurenti, G.; Levi, G.; Margotti, A.; Massam, T.; Nania, R.; Nemoz, C.; Palmonari, F.; Pesci, A.; Polini, A.; Ricci, F.; Sartorelli, G.; Zamora Garcia, Y.; Zichichi, A.; Amelung, C.; Bornheim, A.; Brock, I.; Coböken, K.; Crittenden, J.; Deffner, R.; Eckert, M.; Grothe, M.; Hartmann, H.; Heinloth, K.; Heinz, L.; Hilger, E.; Jakob, H. P.; Katz, U. F.; Kerger, R.; Paul, E.; Pfeiffer, M.; Rembser, Ch; Stamm, J.; Wedemeyer, R.; Wieber, H.; Bailey, D. S.; Campbell-Robson, S.; Cottingham, W. N.; Foster, B.; Hall-Wilton, R.; Hayes, M. E.; Heath, G. P.; Heath, H. F.; McFall, J. D.; Piccioni, D.; Roff, D. G.; Tapper, R. J.; Arneodo, M.; Ayad, R.; Capua, M.; Garfagnini, A.; Iannotti, L.; Schioppa, M.; Susinno, G.; Kim, J. Y.; Lee, J. H.; Lim, I. T.; Pac, M. Y.; Caldwell, A.; Cartiglia, N.; Jing, Z.; Liu, W.; Mellado, B.; Parsons, J. A.; Ritz, S.; Sampson, S.; Sciulli, F.; Straub, P. B.; Zhu, Q.; Borzemski, P.; Chwastowski, J.; Eskreys, A.; Figiel, J.; Klimek, K.; Przybycień, M. B.; Zawiejski, L.; Adamczyk, L.; Bednarek, B.; Bukowy, M.; Czermak, A.; Jeleń, K.; Kisielewska, D.; Kowalski, T.; Przybycień, M.; Rulikowska-Zarebska, E.; Suszycki, L.; Zaja̧c, J.; Dulinński, Z.; Kotanński, A.; Abbiendi, G.; Bauerdick, L. A T; Behrens, U.; Beier, H.; Bienlein, J. K.; Cases, G.; Deppe, O.; Desler, K.; Drews, G.; Fricke, U.; Gilkinson, D. J.; Glasman, C.; Göttlicher, P.; Haas, T.; Hain, W.; Hasell, D.; Johnson, K. F.; Kasemann, M.; Koch, W.; Kötz, U.; Kowalski, H.; Labs, J.; Lindemann, L.; Löhr, B.; Löwe, M.; Mańczak, O.; Milewski, J.; Monteiro, T.; Ng, J. S T; Notz, D.; Ohrenberg, K.; Park, I. H.; Pellegrino, A.; Pelucchi, F.; Piotrzkowski, K.; Roco, M.; Rohde, M.; Roldán, J.; Ryan, J. J.; Savin, A. A.; Schneekloth, U.; Schwarzer, O.; Selonke, F.; Surrow, B.; Tassi, E.; Voß, T.; Westphal, D.; Wolf, G.; Wollmer, U.; Youngman, C.; Zarnecki, A. F.; Zeuner, W.; Burow, B. D.; Grabosch, H. J.; Meyer, A.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P.; Anzivino, G.; Maccarrone, G.; Votano, L.; Bamberger, A.; Eisenhardt, S.; Markun, P.; Trefzger, T.; Wölfle, S.; Bromley, J. T.; Brook, N. H.; Bussey, P. J.; Doyle, A. T.; Macdonald, N.; Saxon, D. H.; Sinclair, L. E.; Strickland, E.; Waugh, R.; Bohnet, I.; Gendner, N.; Holm, U.; Meyer-Larsen, A.; Salehi, H.; Wick, K.; Gladilin, L. K.; Horstmann, D.; Kçira, D.; Klanner, R.; Lohrmann, E.; Poelz, G.; Schott, W.; Zetsche, F.; Bacon, T. C.; Butterworth, I.; Cole, J. E.; Howell, G.; Hung, B. H Y; Lamberti, L.; Long, K. R.; Miller, D. B.; Pavel, N.; Prinias, A.; Sedgbeer, J. K.; Sideris, D.; Walker, R.; Mallik, U.; Wang, S. M.; Wu, J. T.; Cloth, P.; Filges, D.; Fleck, J. I.; Ishii, T.; Kuze, M.; Suzuki, I.; Tokushuku, K.; Yamada, S.; Yamauchi, K.; Yamazaki, Y.; Hong, S. J.; Lee, S. B.; Nam, S. W.; Park, Sung Keun; Barreiro, F.; Fernández, J. P.; García, G.; Graciani, R.; Hernández, J. M.; Hervás, L.; Labarga, L.; Martínez, M.; del Peso, J.; Puga, J.; Terrón, J.; de Trocóniz, J. F.; Corriveau, F.; Hanna, D. S.; Hartmann, J.; Hung, L. W.; Murray, W. N.; Ochs, A.; Riveline, M.; Stairs, D. G.; St-Laurent, M.; Ullmann, R.; Tsurugai, T.; Bashkirov, V.; Dolgoshein, B. A.; Stifutkin, A.; Bashindzhagyan, G. L.; Ermolov, P. F.; Golubkov, Y. A.; Khein, L. A.; Korotkova, N. A.; Korzhavina, I. A.; Kuzmin, V. A.; Lukina, O. Y.; Proskuryakov, A. S.; Shcheglova, L. M.; Solomin, A. N.; Zotkin, S. A.; Bokel, C.; Botje, M.; Brümmer, N.; Chlebana, F.; Engelen, J.; Koffeman, E.; Kooijman, P.; van Sighem, A.; Tiecke, H.; Tuning, N.; Verkerke, W.; Vossebeld, J.; Vreeswijk, M.; Wiggers, L.; de Wolf, E.; Acosta, D.; Bylsma, B.; Durkin, L. S.; Gilmore, J.; Ginsburg, C. M.; Kim, C. L.; Ling, T. Y.; Nylander, P.; Romanowski, T. A.; Blaikley, H. E.; Cashmore, R. J.; Cooper-Sarkar, A. M.; Devenish, R. C E; Edmonds, J. K.; Große-Knetter, J.; Harnew, N.; Nath, C.; Noyes, V. A.; Quadt, A.; Ruske, O.; Tickner, J. R.; Uijterwaal, H.; Walczak, R.; Waters, D. S.; Bertolin, A.; Brugnera, R.; Carlin, R.; Dal Corso, F.; Dosselli, U.; Limentani, S.; Morandin, M.; Posocco, M.; Stanco, L.; Stroili, R.; Voci, C.; Bulmahn, J.; Oh, B. Y.; Okrasiński, J. R.; Toothacker, W. S.; Whitmore, J. J.; Iga, Y.; D'Agostini, G.; Marini, G.; Nigro, A.; Raso, M.; Hart, J. C.; McCubbin, N. A.; Shah, T. P.; Barberis, E.; Epperson, D.; Heusch, C.; Rahn, J. T.; Sadrozinski, H. F W; Seiden, A.; Wichmann, R.; Williams, D. C.; Abramowicz, H.; Briskin, G.; Dagan, S.; Kananov, S.; Levy, A.; Abe, T.; Fusayasu, T.; Inuzuka, M.; Nagano, K.; Umemori, K.; Yamashita, T.; Hamatsu, R.; Hirose, T.; Homma, K.; Kitamura, S.; Matsushita, T.; Cirio, R.; Costa, M.; Ferrero, M. I.; Maselli, S.; Monaco, V.; Peroni, C.; Petrucci, M. C.; Ruspa, M.; Sacchi, R.; Solano, A.; Staiano, A.; Dardo, M.; Bailey, D. C.; Fagerstroem, C. P.; Galea, R.; Hartner, G. F.; Joo, K. K.; Levman, G. M.; Martin, J. F.; Orr, R. S.; Polenz, S.; Sabetfakhri, A.; Simmons, D.; Teuscher, R. J.; Butterworth, J. M.; Catterall, C. D.; Jones, T. W.; Lane, J. B.; Saunders, R. L.; Sutton, M. R.; Wing, M.; Ciborowski, J.; Grzelak, G.; Kasprzak, M.; Muchorowski, K.; Nowak, R. J.; Pawlak, J. M.; Pawlak, R.; Tymieniecka, T.; Wróblewski, A. K.; Zakrzewski, J. A.; Adamus, M.; Coldewey, C.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Badgett, W. F.; Chapin, D.; Cross, R.; Dasu, S.; Foudas, C.; Loveless, R. J.; Mattingly, S.; Reeder, D. D.; Smith, W. H.; Vaiciulis, A.; Wodarczyk, M.; Deshpande, A.; Dhawan, S.; Hughes, V. W.; Bhadra, S.; Frisken, W. R.; Khakzad, M.; Schmidke, W. B.

In: European Physical Journal C, Vol. 2, No. 2, 01.12.1998, p. 247-267.

Research output: Contribution to journalArticle

Breitweg, J, Derrick, M, Krakauer, D, Magill, S, Mikunas, D, Musgrave, B, Repond, J, Stanek, R, Talaga, RL, Yoshida, R, Zhang, H, Mattingly, MCK, Anselmo, F, Antonioli, P, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Cara Romeo, G, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Contin, A, Corradi, M, de Pasquale, S, Gialas, I, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Margotti, A, Massam, T, Nania, R, Nemoz, C, Palmonari, F, Pesci, A, Polini, A, Ricci, F, Sartorelli, G, Zamora Garcia, Y, Zichichi, A, Amelung, C, Bornheim, A, Brock, I, Coböken, K, Crittenden, J, Deffner, R, Eckert, M, Grothe, M, Hartmann, H, Heinloth, K, Heinz, L, Hilger, E, Jakob, HP, Katz, UF, Kerger, R, Paul, E, Pfeiffer, M, Rembser, C, Stamm, J, Wedemeyer, R, Wieber, H, Bailey, DS, Campbell-Robson, S, Cottingham, WN, Foster, B, Hall-Wilton, R, Hayes, ME, Heath, GP, Heath, HF, McFall, JD, Piccioni, D, Roff, DG, Tapper, RJ, Arneodo, M, Ayad, R, Capua, M, Garfagnini, A, Iannotti, L, Schioppa, M, Susinno, G, Kim, JY, Lee, JH, Lim, IT, Pac, MY, Caldwell, A, Cartiglia, N, Jing, Z, Liu, W, Mellado, B, Parsons, JA, Ritz, S, Sampson, S, Sciulli, F, Straub, PB, Zhu, Q, Borzemski, P, Chwastowski, J, Eskreys, A, Figiel, J, Klimek, K, Przybycień, MB, Zawiejski, L, Adamczyk, L, Bednarek, B, Bukowy, M, Czermak, A, Jeleń, K, Kisielewska, D, Kowalski, T, Przybycień, M, Rulikowska-Zarebska, E, Suszycki, L, Zaja̧c, J, Dulinński, Z, Kotanński, A, Abbiendi, G, Bauerdick, LAT, Behrens, U, Beier, H, Bienlein, JK, Cases, G, Deppe, O, Desler, K, Drews, G, Fricke, U, Gilkinson, DJ, Glasman, C, Göttlicher, P, Haas, T, Hain, W, Hasell, D, Johnson, KF, Kasemann, M, Koch, W, Kötz, U, Kowalski, H, Labs, J, Lindemann, L, Löhr, B, Löwe, M, Mańczak, O, Milewski, J, Monteiro, T, Ng, JST, Notz, D, Ohrenberg, K, Park, IH, Pellegrino, A, Pelucchi, F, Piotrzkowski, K, Roco, M, Rohde, M, Roldán, J, Ryan, JJ, Savin, AA, Schneekloth, U, Schwarzer, O, Selonke, F, Surrow, B, Tassi, E, Voß, T, Westphal, D, Wolf, G, Wollmer, U, Youngman, C, Zarnecki, AF, Zeuner, W, Burow, BD, Grabosch, HJ, Meyer, A, Schlenstedt, S, Barbagli, G, Gallo, E, Pelfer, P, Anzivino, G, Maccarrone, G, Votano, L, Bamberger, A, Eisenhardt, S, Markun, P, Trefzger, T, Wölfle, S, Bromley, JT, Brook, NH, Bussey, PJ, Doyle, AT, Macdonald, N, Saxon, DH, Sinclair, LE, Strickland, E, Waugh, R, Bohnet, I, Gendner, N, Holm, U, Meyer-Larsen, A, Salehi, H, Wick, K, Gladilin, LK, Horstmann, D, Kçira, D, Klanner, R, Lohrmann, E, Poelz, G, Schott, W, Zetsche, F, Bacon, TC, Butterworth, I, Cole, JE, Howell, G, Hung, BHY, Lamberti, L, Long, KR, Miller, DB, Pavel, N, Prinias, A, Sedgbeer, JK, Sideris, D, Walker, R, Mallik, U, Wang, SM, Wu, JT, Cloth, P, Filges, D, Fleck, JI, Ishii, T, Kuze, M, Suzuki, I, Tokushuku, K, Yamada, S, Yamauchi, K, Yamazaki, Y, Hong, SJ, Lee, SB, Nam, SW, Park, SK, Barreiro, F, Fernández, JP, García, G, Graciani, R, Hernández, JM, Hervás, L, Labarga, L, Martínez, M, del Peso, J, Puga, J, Terrón, J, de Trocóniz, JF, Corriveau, F, Hanna, DS, Hartmann, J, Hung, LW, Murray, WN, Ochs, A, Riveline, M, Stairs, DG, St-Laurent, M, Ullmann, R, Tsurugai, T, Bashkirov, V, Dolgoshein, BA, Stifutkin, A, Bashindzhagyan, GL, Ermolov, PF, Golubkov, YA, Khein, LA, Korotkova, NA, Korzhavina, IA, Kuzmin, VA, Lukina, OY, Proskuryakov, AS, Shcheglova, LM, Solomin, AN, Zotkin, SA, Bokel, C, Botje, M, Brümmer, N, Chlebana, F, Engelen, J, Koffeman, E, Kooijman, P, van Sighem, A, Tiecke, H, Tuning, N, Verkerke, W, Vossebeld, J, Vreeswijk, M, Wiggers, L, de Wolf, E, Acosta, D, Bylsma, B, Durkin, LS, Gilmore, J, Ginsburg, CM, Kim, CL, Ling, TY, Nylander, P, Romanowski, TA, Blaikley, HE, Cashmore, RJ, Cooper-Sarkar, AM, Devenish, RCE, Edmonds, JK, Große-Knetter, J, Harnew, N, Nath, C, Noyes, VA, Quadt, A, Ruske, O, Tickner, JR, Uijterwaal, H, Walczak, R, Waters, DS, Bertolin, A, Brugnera, R, Carlin, R, Dal Corso, F, Dosselli, U, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Bulmahn, J, Oh, BY, Okrasiński, JR, Toothacker, WS, Whitmore, JJ, Iga, Y, D'Agostini, G, Marini, G, Nigro, A, Raso, M, Hart, JC, McCubbin, NA, Shah, TP, Barberis, E, Epperson, D, Heusch, C, Rahn, JT, Sadrozinski, HFW, Seiden, A, Wichmann, R, Williams, DC, Abramowicz, H, Briskin, G, Dagan, S, Kananov, S, Levy, A, Abe, T, Fusayasu, T, Inuzuka, M, Nagano, K, Umemori, K, Yamashita, T, Hamatsu, R, Hirose, T, Homma, K, Kitamura, S, Matsushita, T, Cirio, R, Costa, M, Ferrero, MI, Maselli, S, Monaco, V, Peroni, C, Petrucci, MC, Ruspa, M, Sacchi, R, Solano, A, Staiano, A, Dardo, M, Bailey, DC, Fagerstroem, CP, Galea, R, Hartner, GF, Joo, KK, Levman, GM, Martin, JF, Orr, RS, Polenz, S, Sabetfakhri, A, Simmons, D, Teuscher, RJ, Butterworth, JM, Catterall, CD, Jones, TW, Lane, JB, Saunders, RL, Sutton, MR, Wing, M, Ciborowski, J, Grzelak, G, Kasprzak, M, Muchorowski, K, Nowak, RJ, Pawlak, JM, Pawlak, R, Tymieniecka, T, Wróblewski, AK, Zakrzewski, JA, Adamus, M, Coldewey, C, Eisenberg, Y, Hochman, D, Karshon, U, Badgett, WF, Chapin, D, Cross, R, Dasu, S, Foudas, C, Loveless, RJ, Mattingly, S, Reeder, DD, Smith, WH, Vaiciulis, A, Wodarczyk, M, Deshpande, A, Dhawan, S, Hughes, VW, Bhadra, S, Frisken, WR, Khakzad, M & Schmidke, WB 1998, 'Elastic and proton-dissociative ρ0 photoproduction at HERA', European Physical Journal C, vol. 2, no. 2, pp. 247-267.
Breitweg J, Derrick M, Krakauer D, Magill S, Mikunas D, Musgrave B et al. Elastic and proton-dissociative ρ0 photoproduction at HERA. European Physical Journal C. 1998 Dec 1;2(2):247-267.
Breitweg, J. ; Derrick, M. ; Krakauer, D. ; Magill, S. ; Mikunas, D. ; Musgrave, B. ; Repond, J. ; Stanek, R. ; Talaga, R. L. ; Yoshida, R. ; Zhang, H. ; Mattingly, M. C K ; Anselmo, F. ; Antonioli, P. ; Bari, G. ; Basile, M. ; Bellagamba, L. ; Boscherini, D. ; Bruni, A. ; Bruni, G. ; Cara Romeo, G. ; Castellini, G. ; Chiarini, M. ; Cifarelli, L. ; Cindolo, F. ; Contin, A. ; Corradi, M. ; de Pasquale, S. ; Gialas, I. ; Giusti, P. ; Iacobucci, G. ; Laurenti, G. ; Levi, G. ; Margotti, A. ; Massam, T. ; Nania, R. ; Nemoz, C. ; Palmonari, F. ; Pesci, A. ; Polini, A. ; Ricci, F. ; Sartorelli, G. ; Zamora Garcia, Y. ; Zichichi, A. ; Amelung, C. ; Bornheim, A. ; Brock, I. ; Coböken, K. ; Crittenden, J. ; Deffner, R. ; Eckert, M. ; Grothe, M. ; Hartmann, H. ; Heinloth, K. ; Heinz, L. ; Hilger, E. ; Jakob, H. P. ; Katz, U. F. ; Kerger, R. ; Paul, E. ; Pfeiffer, M. ; Rembser, Ch ; Stamm, J. ; Wedemeyer, R. ; Wieber, H. ; Bailey, D. S. ; Campbell-Robson, S. ; Cottingham, W. N. ; Foster, B. ; Hall-Wilton, R. ; Hayes, M. E. ; Heath, G. P. ; Heath, H. F. ; McFall, J. D. ; Piccioni, D. ; Roff, D. G. ; Tapper, R. J. ; Arneodo, M. ; Ayad, R. ; Capua, M. ; Garfagnini, A. ; Iannotti, L. ; Schioppa, M. ; Susinno, G. ; Kim, J. Y. ; Lee, J. H. ; Lim, I. T. ; Pac, M. Y. ; Caldwell, A. ; Cartiglia, N. ; Jing, Z. ; Liu, W. ; Mellado, B. ; Parsons, J. A. ; Ritz, S. ; Sampson, S. ; Sciulli, F. ; Straub, P. B. ; Zhu, Q. ; Borzemski, P. ; Chwastowski, J. ; Eskreys, A. ; Figiel, J. ; Klimek, K. ; Przybycień, M. B. ; Zawiejski, L. ; Adamczyk, L. ; Bednarek, B. ; Bukowy, M. ; Czermak, A. ; Jeleń, K. ; Kisielewska, D. ; Kowalski, T. ; Przybycień, M. ; Rulikowska-Zarebska, E. ; Suszycki, L. ; Zaja̧c, J. ; Dulinński, Z. ; Kotanński, A. ; Abbiendi, G. ; Bauerdick, L. A T ; Behrens, U. ; Beier, H. ; Bienlein, J. K. ; Cases, G. ; Deppe, O. ; Desler, K. ; Drews, G. ; Fricke, U. ; Gilkinson, D. J. ; Glasman, C. ; Göttlicher, P. ; Haas, T. ; Hain, W. ; Hasell, D. ; Johnson, K. F. ; Kasemann, M. ; Koch, W. ; Kötz, U. ; Kowalski, H. ; Labs, J. ; Lindemann, L. ; Löhr, B. ; Löwe, M. ; Mańczak, O. ; Milewski, J. ; Monteiro, T. ; Ng, J. S T ; Notz, D. ; Ohrenberg, K. ; Park, I. H. ; Pellegrino, A. ; Pelucchi, F. ; Piotrzkowski, K. ; Roco, M. ; Rohde, M. ; Roldán, J. ; Ryan, J. J. ; Savin, A. A. ; Schneekloth, U. ; Schwarzer, O. ; Selonke, F. ; Surrow, B. ; Tassi, E. ; Voß, T. ; Westphal, D. ; Wolf, G. ; Wollmer, U. ; Youngman, C. ; Zarnecki, A. F. ; Zeuner, W. ; Burow, B. D. ; Grabosch, H. J. ; Meyer, A. ; Schlenstedt, S. ; Barbagli, G. ; Gallo, E. ; Pelfer, P. ; Anzivino, G. ; Maccarrone, G. ; Votano, L. ; Bamberger, A. ; Eisenhardt, S. ; Markun, P. ; Trefzger, T. ; Wölfle, S. ; Bromley, J. T. ; Brook, N. H. ; Bussey, P. J. ; Doyle, A. T. ; Macdonald, N. ; Saxon, D. H. ; Sinclair, L. E. ; Strickland, E. ; Waugh, R. ; Bohnet, I. ; Gendner, N. ; Holm, U. ; Meyer-Larsen, A. ; Salehi, H. ; Wick, K. ; Gladilin, L. K. ; Horstmann, D. ; Kçira, D. ; Klanner, R. ; Lohrmann, E. ; Poelz, G. ; Schott, W. ; Zetsche, F. ; Bacon, T. C. ; Butterworth, I. ; Cole, J. E. ; Howell, G. ; Hung, B. H Y ; Lamberti, L. ; Long, K. R. ; Miller, D. B. ; Pavel, N. ; Prinias, A. ; Sedgbeer, J. K. ; Sideris, D. ; Walker, R. ; Mallik, U. ; Wang, S. M. ; Wu, J. T. ; Cloth, P. ; Filges, D. ; Fleck, J. I. ; Ishii, T. ; Kuze, M. ; Suzuki, I. ; Tokushuku, K. ; Yamada, S. ; Yamauchi, K. ; Yamazaki, Y. ; Hong, S. J. ; Lee, S. B. ; Nam, S. W. ; Park, Sung Keun ; Barreiro, F. ; Fernández, J. P. ; García, G. ; Graciani, R. ; Hernández, J. M. ; Hervás, L. ; Labarga, L. ; Martínez, M. ; del Peso, J. ; Puga, J. ; Terrón, J. ; de Trocóniz, J. F. ; Corriveau, F. ; Hanna, D. S. ; Hartmann, J. ; Hung, L. W. ; Murray, W. N. ; Ochs, A. ; Riveline, M. ; Stairs, D. G. ; St-Laurent, M. ; Ullmann, R. ; Tsurugai, T. ; Bashkirov, V. ; Dolgoshein, B. A. ; Stifutkin, A. ; Bashindzhagyan, G. L. ; Ermolov, P. F. ; Golubkov, Y. A. ; Khein, L. A. ; Korotkova, N. A. ; Korzhavina, I. A. ; Kuzmin, V. A. ; Lukina, O. Y. ; Proskuryakov, A. S. ; Shcheglova, L. M. ; Solomin, A. N. ; Zotkin, S. A. ; Bokel, C. ; Botje, M. ; Brümmer, N. ; Chlebana, F. ; Engelen, J. ; Koffeman, E. ; Kooijman, P. ; van Sighem, A. ; Tiecke, H. ; Tuning, N. ; Verkerke, W. ; Vossebeld, J. ; Vreeswijk, M. ; Wiggers, L. ; de Wolf, E. ; Acosta, D. ; Bylsma, B. ; Durkin, L. S. ; Gilmore, J. ; Ginsburg, C. M. ; Kim, C. L. ; Ling, T. Y. ; Nylander, P. ; Romanowski, T. A. ; Blaikley, H. E. ; Cashmore, R. J. ; Cooper-Sarkar, A. M. ; Devenish, R. C E ; Edmonds, J. K. ; Große-Knetter, J. ; Harnew, N. ; Nath, C. ; Noyes, V. A. ; Quadt, A. ; Ruske, O. ; Tickner, J. R. ; Uijterwaal, H. ; Walczak, R. ; Waters, D. S. ; Bertolin, A. ; Brugnera, R. ; Carlin, R. ; Dal Corso, F. ; Dosselli, U. ; Limentani, S. ; Morandin, M. ; Posocco, M. ; Stanco, L. ; Stroili, R. ; Voci, C. ; Bulmahn, J. ; Oh, B. Y. ; Okrasiński, J. R. ; Toothacker, W. S. ; Whitmore, J. J. ; Iga, Y. ; D'Agostini, G. ; Marini, G. ; Nigro, A. ; Raso, M. ; Hart, J. C. ; McCubbin, N. A. ; Shah, T. P. ; Barberis, E. ; Epperson, D. ; Heusch, C. ; Rahn, J. T. ; Sadrozinski, H. F W ; Seiden, A. ; Wichmann, R. ; Williams, D. C. ; Abramowicz, H. ; Briskin, G. ; Dagan, S. ; Kananov, S. ; Levy, A. ; Abe, T. ; Fusayasu, T. ; Inuzuka, M. ; Nagano, K. ; Umemori, K. ; Yamashita, T. ; Hamatsu, R. ; Hirose, T. ; Homma, K. ; Kitamura, S. ; Matsushita, T. ; Cirio, R. ; Costa, M. ; Ferrero, M. I. ; Maselli, S. ; Monaco, V. ; Peroni, C. ; Petrucci, M. C. ; Ruspa, M. ; Sacchi, R. ; Solano, A. ; Staiano, A. ; Dardo, M. ; Bailey, D. C. ; Fagerstroem, C. P. ; Galea, R. ; Hartner, G. F. ; Joo, K. K. ; Levman, G. M. ; Martin, J. F. ; Orr, R. S. ; Polenz, S. ; Sabetfakhri, A. ; Simmons, D. ; Teuscher, R. J. ; Butterworth, J. M. ; Catterall, C. D. ; Jones, T. W. ; Lane, J. B. ; Saunders, R. L. ; Sutton, M. R. ; Wing, M. ; Ciborowski, J. ; Grzelak, G. ; Kasprzak, M. ; Muchorowski, K. ; Nowak, R. J. ; Pawlak, J. M. ; Pawlak, R. ; Tymieniecka, T. ; Wróblewski, A. K. ; Zakrzewski, J. A. ; Adamus, M. ; Coldewey, C. ; Eisenberg, Y. ; Hochman, D. ; Karshon, U. ; Badgett, W. F. ; Chapin, D. ; Cross, R. ; Dasu, S. ; Foudas, C. ; Loveless, R. J. ; Mattingly, S. ; Reeder, D. D. ; Smith, W. H. ; Vaiciulis, A. ; Wodarczyk, M. ; Deshpande, A. ; Dhawan, S. ; Hughes, V. W. ; Bhadra, S. ; Frisken, W. R. ; Khakzad, M. ; Schmidke, W. B. / Elastic and proton-dissociative ρ0 photoproduction at HERA. In: European Physical Journal C. 1998 ; Vol. 2, No. 2. pp. 247-267.
@article{993a55295cec4b7aa713c98361682c9a,
title = "Elastic and proton-dissociative ρ0 photoproduction at HERA",
abstract = "Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) has been studied in ep interactions at HERA for photon-proton centre-of-mass energies in the range 50 < W < 100 GeV and for |t| < 0.5 GeV2, where t is the square of the four-momentum transfer at the proton vertex; the results on the proton-dissociative reaction are presented for masses of the dissociated proton system in the range M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 resonance shape is asymmetric; this asymmetry decreases with increasing |t|, as expected in models in which the asymmetry is ascribed to the interference of resonant and non-resonant π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (syst.) GeV-4. The t dependence has also been studied as a function of W and a value of the slope of the pomeron trajectory α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W and the polar and azimuthal angles of the pions in the helicity frame are the same within errors as those for the elastic process. The t distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).",
author = "J. Breitweg and M. Derrick and D. Krakauer and S. Magill and D. Mikunas and B. Musgrave and J. Repond and R. Stanek and Talaga, {R. L.} and R. Yoshida and H. Zhang and Mattingly, {M. C K} and F. Anselmo and P. Antonioli and G. Bari and M. Basile and L. Bellagamba and D. Boscherini and A. Bruni and G. Bruni and {Cara Romeo}, G. and G. Castellini and M. Chiarini and L. Cifarelli and F. Cindolo and A. Contin and M. Corradi and {de Pasquale}, S. and I. Gialas and P. Giusti and G. Iacobucci and G. Laurenti and G. Levi and A. Margotti and T. Massam and R. Nania and C. Nemoz and F. Palmonari and A. Pesci and A. Polini and F. Ricci and G. Sartorelli and {Zamora Garcia}, Y. and A. Zichichi and C. Amelung and A. Bornheim and I. Brock and K. Cob{\"o}ken and J. Crittenden and R. Deffner and M. Eckert and M. Grothe and H. Hartmann and K. Heinloth and L. Heinz and E. Hilger and Jakob, {H. P.} and Katz, {U. F.} and R. Kerger and E. Paul and M. Pfeiffer and Ch Rembser and J. Stamm and R. Wedemeyer and H. Wieber and Bailey, {D. S.} and S. Campbell-Robson and Cottingham, {W. N.} and B. Foster and R. Hall-Wilton and Hayes, {M. E.} and Heath, {G. P.} and Heath, {H. F.} and McFall, {J. D.} and D. Piccioni and Roff, {D. G.} and Tapper, {R. J.} and M. Arneodo and R. Ayad and M. Capua and A. Garfagnini and L. Iannotti and M. Schioppa and G. Susinno and Kim, {J. Y.} and Lee, {J. H.} and Lim, {I. T.} and Pac, {M. Y.} and A. Caldwell and N. Cartiglia and Z. Jing and W. Liu and B. Mellado and Parsons, {J. A.} and S. Ritz and S. Sampson and F. Sciulli and Straub, {P. B.} and Q. Zhu and P. Borzemski and J. Chwastowski and A. Eskreys and J. Figiel and K. Klimek and Przybycień, {M. B.} and L. Zawiejski and L. Adamczyk and B. Bednarek and M. Bukowy and A. Czermak and K. Jeleń and D. Kisielewska and T. Kowalski and M. Przybycień and E. Rulikowska-Zarebska and L. Suszycki and J. Zaja̧c and Z. Dulinński and A. Kotanński and G. Abbiendi and Bauerdick, {L. A T} and U. Behrens and H. Beier and Bienlein, {J. K.} and G. Cases and O. Deppe and K. Desler and G. Drews and U. Fricke and Gilkinson, {D. J.} and C. Glasman and P. G{\"o}ttlicher and T. Haas and W. Hain and D. Hasell and Johnson, {K. F.} and M. Kasemann and W. Koch and U. K{\"o}tz and H. Kowalski and J. Labs and L. Lindemann and B. L{\"o}hr and M. L{\"o}we and O. Mańczak and J. Milewski and T. Monteiro and Ng, {J. S T} and D. Notz and K. Ohrenberg and Park, {I. H.} and A. Pellegrino and F. Pelucchi and K. Piotrzkowski and M. Roco and M. Rohde and J. Rold{\'a}n and Ryan, {J. J.} and Savin, {A. A.} and U. Schneekloth and O. Schwarzer and F. Selonke and B. Surrow and E. Tassi and T. Vo{\ss} and D. Westphal and G. Wolf and U. Wollmer and C. Youngman and Zarnecki, {A. F.} and W. Zeuner and Burow, {B. D.} and Grabosch, {H. J.} and A. Meyer and S. Schlenstedt and G. Barbagli and E. Gallo and P. Pelfer and G. Anzivino and G. Maccarrone and L. Votano and A. Bamberger and S. Eisenhardt and P. Markun and T. Trefzger and S. W{\"o}lfle and Bromley, {J. T.} and Brook, {N. H.} and Bussey, {P. J.} and Doyle, {A. T.} and N. Macdonald and Saxon, {D. H.} and Sinclair, {L. E.} and E. Strickland and R. Waugh and I. Bohnet and N. Gendner and U. Holm and A. Meyer-Larsen and H. Salehi and K. Wick and Gladilin, {L. K.} and D. Horstmann and D. K{\cc}ira and R. Klanner and E. Lohrmann and G. Poelz and W. Schott and F. Zetsche and Bacon, {T. C.} and I. Butterworth and Cole, {J. E.} and G. Howell and Hung, {B. H Y} and L. Lamberti and Long, {K. R.} and Miller, {D. B.} and N. Pavel and A. Prinias and Sedgbeer, {J. K.} and D. Sideris and R. Walker and U. Mallik and Wang, {S. M.} and Wu, {J. T.} and P. Cloth and D. Filges and Fleck, {J. I.} and T. Ishii and M. Kuze and I. Suzuki and K. Tokushuku and S. Yamada and K. Yamauchi and Y. Yamazaki and Hong, {S. J.} and Lee, {S. B.} and Nam, {S. W.} and Park, {Sung Keun} and F. Barreiro and Fern{\'a}ndez, {J. P.} and G. Garc{\'i}a and R. Graciani and Hern{\'a}ndez, {J. M.} and L. Herv{\'a}s and L. Labarga and M. Mart{\'i}nez and {del Peso}, J. and J. Puga and J. Terr{\'o}n and {de Troc{\'o}niz}, {J. F.} and F. Corriveau and Hanna, {D. S.} and J. Hartmann and Hung, {L. W.} and Murray, {W. N.} and A. Ochs and M. Riveline and Stairs, {D. G.} and M. St-Laurent and R. Ullmann and T. Tsurugai and V. Bashkirov and Dolgoshein, {B. A.} and A. Stifutkin and Bashindzhagyan, {G. L.} and Ermolov, {P. F.} and Golubkov, {Y. A.} and Khein, {L. A.} and Korotkova, {N. A.} and Korzhavina, {I. A.} and Kuzmin, {V. A.} and Lukina, {O. Y.} and Proskuryakov, {A. S.} and Shcheglova, {L. M.} and Solomin, {A. N.} and Zotkin, {S. A.} and C. Bokel and M. Botje and N. Br{\"u}mmer and F. Chlebana and J. Engelen and E. Koffeman and P. Kooijman and {van Sighem}, A. and H. Tiecke and N. Tuning and W. Verkerke and J. Vossebeld and M. Vreeswijk and L. Wiggers and {de Wolf}, E. and D. Acosta and B. Bylsma and Durkin, {L. S.} and J. Gilmore and Ginsburg, {C. M.} and Kim, {C. L.} and Ling, {T. Y.} and P. Nylander and Romanowski, {T. A.} and Blaikley, {H. E.} and Cashmore, {R. J.} and Cooper-Sarkar, {A. M.} and Devenish, {R. C E} and Edmonds, {J. K.} and J. Gro{\ss}e-Knetter and N. Harnew and C. Nath and Noyes, {V. A.} and A. Quadt and O. Ruske and Tickner, {J. R.} and H. Uijterwaal and R. Walczak and Waters, {D. S.} and A. Bertolin and R. Brugnera and R. Carlin and {Dal Corso}, F. and U. Dosselli and S. Limentani and M. Morandin and M. Posocco and L. Stanco and R. Stroili and C. Voci and J. Bulmahn and Oh, {B. Y.} and Okrasiński, {J. R.} and Toothacker, {W. S.} and Whitmore, {J. J.} and Y. Iga and G. D'Agostini and G. Marini and A. Nigro and M. Raso and Hart, {J. C.} and McCubbin, {N. A.} and Shah, {T. P.} and E. Barberis and D. Epperson and C. Heusch and Rahn, {J. T.} and Sadrozinski, {H. F W} and A. Seiden and R. Wichmann and Williams, {D. C.} and H. Abramowicz and G. Briskin and S. Dagan and S. Kananov and A. Levy and T. Abe and T. Fusayasu and M. Inuzuka and K. Nagano and K. Umemori and T. Yamashita and R. Hamatsu and T. Hirose and K. Homma and S. Kitamura and T. Matsushita and R. Cirio and M. Costa and Ferrero, {M. I.} and S. Maselli and V. Monaco and C. Peroni and Petrucci, {M. C.} and M. Ruspa and R. Sacchi and A. Solano and A. Staiano and M. Dardo and Bailey, {D. C.} and Fagerstroem, {C. P.} and R. Galea and Hartner, {G. F.} and Joo, {K. K.} and Levman, {G. M.} and Martin, {J. F.} and Orr, {R. S.} and S. Polenz and A. Sabetfakhri and D. Simmons and Teuscher, {R. J.} and Butterworth, {J. M.} and Catterall, {C. D.} and Jones, {T. W.} and Lane, {J. B.} and Saunders, {R. L.} and Sutton, {M. R.} and M. Wing and J. Ciborowski and G. Grzelak and M. Kasprzak and K. Muchorowski and Nowak, {R. J.} and Pawlak, {J. M.} and R. Pawlak and T. Tymieniecka and Wr{\'o}blewski, {A. K.} and Zakrzewski, {J. A.} and M. Adamus and C. Coldewey and Y. Eisenberg and D. Hochman and U. Karshon and Badgett, {W. F.} and D. Chapin and R. Cross and S. Dasu and C. Foudas and Loveless, {R. J.} and S. Mattingly and Reeder, {D. D.} and Smith, {W. H.} and A. Vaiciulis and M. Wodarczyk and A. Deshpande and S. Dhawan and Hughes, {V. W.} and S. Bhadra and Frisken, {W. R.} and M. Khakzad and Schmidke, {W. B.}",
year = "1998",
month = "12",
day = "1",
language = "English",
volume = "2",
pages = "247--267",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer New York",
number = "2",

}

TY - JOUR

T1 - Elastic and proton-dissociative ρ0 photoproduction at HERA

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AU - Bohnet, I.

AU - Gendner, N.

AU - Holm, U.

AU - Meyer-Larsen, A.

AU - Salehi, H.

AU - Wick, K.

AU - Gladilin, L. K.

AU - Horstmann, D.

AU - Kçira, D.

AU - Klanner, R.

AU - Lohrmann, E.

AU - Poelz, G.

AU - Schott, W.

AU - Zetsche, F.

AU - Bacon, T. C.

AU - Butterworth, I.

AU - Cole, J. E.

AU - Howell, G.

AU - Hung, B. H Y

AU - Lamberti, L.

AU - Long, K. R.

AU - Miller, D. B.

AU - Pavel, N.

AU - Prinias, A.

AU - Sedgbeer, J. K.

AU - Sideris, D.

AU - Walker, R.

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AU - Wang, S. M.

AU - Wu, J. T.

AU - Cloth, P.

AU - Filges, D.

AU - Fleck, J. I.

AU - Ishii, T.

AU - Kuze, M.

AU - Suzuki, I.

AU - Tokushuku, K.

AU - Yamada, S.

AU - Yamauchi, K.

AU - Yamazaki, Y.

AU - Hong, S. J.

AU - Lee, S. B.

AU - Nam, S. W.

AU - Park, Sung Keun

AU - Barreiro, F.

AU - Fernández, J. P.

AU - García, G.

AU - Graciani, R.

AU - Hernández, J. M.

AU - Hervás, L.

AU - Labarga, L.

AU - Martínez, M.

AU - del Peso, J.

AU - Puga, J.

AU - Terrón, J.

AU - de Trocóniz, J. F.

AU - Corriveau, F.

AU - Hanna, D. S.

AU - Hartmann, J.

AU - Hung, L. W.

AU - Murray, W. N.

AU - Ochs, A.

AU - Riveline, M.

AU - Stairs, D. G.

AU - St-Laurent, M.

AU - Ullmann, R.

AU - Tsurugai, T.

AU - Bashkirov, V.

AU - Dolgoshein, B. A.

AU - Stifutkin, A.

AU - Bashindzhagyan, G. L.

AU - Ermolov, P. F.

AU - Golubkov, Y. A.

AU - Khein, L. A.

AU - Korotkova, N. A.

AU - Korzhavina, I. A.

AU - Kuzmin, V. A.

AU - Lukina, O. Y.

AU - Proskuryakov, A. S.

AU - Shcheglova, L. M.

AU - Solomin, A. N.

AU - Zotkin, S. A.

AU - Bokel, C.

AU - Botje, M.

AU - Brümmer, N.

AU - Chlebana, F.

AU - Engelen, J.

AU - Koffeman, E.

AU - Kooijman, P.

AU - van Sighem, A.

AU - Tiecke, H.

AU - Tuning, N.

AU - Verkerke, W.

AU - Vossebeld, J.

AU - Vreeswijk, M.

AU - Wiggers, L.

AU - de Wolf, E.

AU - Acosta, D.

AU - Bylsma, B.

AU - Durkin, L. S.

AU - Gilmore, J.

AU - Ginsburg, C. M.

AU - Kim, C. L.

AU - Ling, T. Y.

AU - Nylander, P.

AU - Romanowski, T. A.

AU - Blaikley, H. E.

AU - Cashmore, R. J.

AU - Cooper-Sarkar, A. M.

AU - Devenish, R. C E

AU - Edmonds, J. K.

AU - Große-Knetter, J.

AU - Harnew, N.

AU - Nath, C.

AU - Noyes, V. A.

AU - Quadt, A.

AU - Ruske, O.

AU - Tickner, J. R.

AU - Uijterwaal, H.

AU - Walczak, R.

AU - Waters, D. S.

AU - Bertolin, A.

AU - Brugnera, R.

AU - Carlin, R.

AU - Dal Corso, F.

AU - Dosselli, U.

AU - Limentani, S.

AU - Morandin, M.

AU - Posocco, M.

AU - Stanco, L.

AU - Stroili, R.

AU - Voci, C.

AU - Bulmahn, J.

AU - Oh, B. Y.

AU - Okrasiński, J. R.

AU - Toothacker, W. S.

AU - Whitmore, J. J.

AU - Iga, Y.

AU - D'Agostini, G.

AU - Marini, G.

AU - Nigro, A.

AU - Raso, M.

AU - Hart, J. C.

AU - McCubbin, N. A.

AU - Shah, T. P.

AU - Barberis, E.

AU - Epperson, D.

AU - Heusch, C.

AU - Rahn, J. T.

AU - Sadrozinski, H. F W

AU - Seiden, A.

AU - Wichmann, R.

AU - Williams, D. C.

AU - Abramowicz, H.

AU - Briskin, G.

AU - Dagan, S.

AU - Kananov, S.

AU - Levy, A.

AU - Abe, T.

AU - Fusayasu, T.

AU - Inuzuka, M.

AU - Nagano, K.

AU - Umemori, K.

AU - Yamashita, T.

AU - Hamatsu, R.

AU - Hirose, T.

AU - Homma, K.

AU - Kitamura, S.

AU - Matsushita, T.

AU - Cirio, R.

AU - Costa, M.

AU - Ferrero, M. I.

AU - Maselli, S.

AU - Monaco, V.

AU - Peroni, C.

AU - Petrucci, M. C.

AU - Ruspa, M.

AU - Sacchi, R.

AU - Solano, A.

AU - Staiano, A.

AU - Dardo, M.

AU - Bailey, D. C.

AU - Fagerstroem, C. P.

AU - Galea, R.

AU - Hartner, G. F.

AU - Joo, K. K.

AU - Levman, G. M.

AU - Martin, J. F.

AU - Orr, R. S.

AU - Polenz, S.

AU - Sabetfakhri, A.

AU - Simmons, D.

AU - Teuscher, R. J.

AU - Butterworth, J. M.

AU - Catterall, C. D.

AU - Jones, T. W.

AU - Lane, J. B.

AU - Saunders, R. L.

AU - Sutton, M. R.

AU - Wing, M.

AU - Ciborowski, J.

AU - Grzelak, G.

AU - Kasprzak, M.

AU - Muchorowski, K.

AU - Nowak, R. J.

AU - Pawlak, J. M.

AU - Pawlak, R.

AU - Tymieniecka, T.

AU - Wróblewski, A. K.

AU - Zakrzewski, J. A.

AU - Adamus, M.

AU - Coldewey, C.

AU - Eisenberg, Y.

AU - Hochman, D.

AU - Karshon, U.

AU - Badgett, W. F.

AU - Chapin, D.

AU - Cross, R.

AU - Dasu, S.

AU - Foudas, C.

AU - Loveless, R. J.

AU - Mattingly, S.

AU - Reeder, D. D.

AU - Smith, W. H.

AU - Vaiciulis, A.

AU - Wodarczyk, M.

AU - Deshpande, A.

AU - Dhawan, S.

AU - Hughes, V. W.

AU - Bhadra, S.

AU - Frisken, W. R.

AU - Khakzad, M.

AU - Schmidke, W. B.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) has been studied in ep interactions at HERA for photon-proton centre-of-mass energies in the range 50 < W < 100 GeV and for |t| < 0.5 GeV2, where t is the square of the four-momentum transfer at the proton vertex; the results on the proton-dissociative reaction are presented for masses of the dissociated proton system in the range M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 resonance shape is asymmetric; this asymmetry decreases with increasing |t|, as expected in models in which the asymmetry is ascribed to the interference of resonant and non-resonant π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (syst.) GeV-4. The t dependence has also been studied as a function of W and a value of the slope of the pomeron trajectory α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W and the polar and azimuthal angles of the pions in the helicity frame are the same within errors as those for the elastic process. The t distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).

AB - Elastic and proton-dissociative ρ0 photoproduction (γp → p0p, γp → ρ0N, respectively, with p0 → π+π-) has been studied in ep interactions at HERA for photon-proton centre-of-mass energies in the range 50 < W < 100 GeV and for |t| < 0.5 GeV2, where t is the square of the four-momentum transfer at the proton vertex; the results on the proton-dissociative reaction are presented for masses of the dissociated proton system in the range M2 N < 0.1W2. For the elastic process, the π+π- invariant mass spectrum has been investigated as a function of t. As in fixed target experiments, the ρ0 resonance shape is asymmetric; this asymmetry decreases with increasing |t|, as expected in models in which the asymmetry is ascribed to the interference of resonant and non-resonant π+π- production. The cross section has been studied as a function of W; a fit to the resonant part with the form Wa gives a = 0.16 ± 0.06 (stat.) +0.11 -0.15 (syst.). The resonant part of the γp → π+π-p cross section is 11.2 ± 0.1 (stat.) +1.1 -1.2 (syst.) μb at 〈W〉 = 71.7 GeV. The t dependence of the cross section can be described by a function of the type Aρ exp (-bρ|t| + cρt2) with bρ = 10.9 ± 0.3 (stat.) +1.0 -0.5 (syst.) GeV-2 and cρ = 2.7 ± 0.9 (stat.) +1.9 -1.7 (syst.) GeV-4. The t dependence has also been studied as a function of W and a value of the slope of the pomeron trajectory α IP′ = 0.23 ± 0.15 (stat.) +0.10 -0.07 (syst.) GeV-2 has been deduced. The ρ0 spin density matrix elements r04 00 r04 1-1 and ℜe[r04 10] have been measured and found to be consistent with expectations based on s-channel helicity conservation. For proton-dissociative π+π- photoproduction in the ρ0 mass range, the distributions of the two-pion invariant mass, W and the polar and azimuthal angles of the pions in the helicity frame are the same within errors as those for the elastic process. The t distribution has been fitted to an exponential function with a slope parameter 5.8 ± 0.3 (stat.) ± 0.5 (syst.) GeV-2. The ratio of the elastic to proton-dissociative ρ0 photoproduction cross section is 2.0 ± 0.2 (stat.) ± 0.7 (syst.).

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UR - http://www.scopus.com/inward/citedby.url?scp=0001043232&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0001043232

VL - 2

SP - 247

EP - 267

JO - European Physical Journal C

JF - European Physical Journal C

SN - 1434-6044

IS - 2

ER -