Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

J. Barrette; R. Bellwied; P. Braun-Munzinger; W. E. Cleland; T. M. Cormier; G. David; J. Dee; G. E. Diebold; O. Dietzsch; J. V. Germani; S. Gilbert; S. V. Greene; J. R. Hall; T. K. Hemmick; N. Herrmann; B. Hong; K. Jayananda; D. Kraus; B. S. Kumar; R. Lacasse; D. Lissauer; W. J. Llope; T. W. Ludlam; S. McCorkle; R. Majka; S. K. Mark; J. T. Mitchell; M. Muthuswamy; E. O'Brien; C. Pruneau; M. N. Rao; F. Rotondo; N. C. daSilva; U. Sonnadara; J. Stachel; H. Takai; E. M. Takagui; T. G. Throwe; G. Wang; D. Wolfe; C. L. Woody; N. Xu; Y. Zhang; Z. Zhang; C. Zou

doi:10.1016/0370-2693(95)00329-J

Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

J. Barrette, R. Bellwied, P. Braun-Munzinger, W. E. Cleland, T. M. Cormier, G. David, J. Dee, G. E. Diebold, O. Dietzsch, J. V. Germani, S. Gilbert, S. V. Greene, J. R. Hall, T. K. Hemmick, N. Herrmann, B. Hong, K. Jayananda, D. Kraus, B. S. Kumar, R. LacasseD. Lissauer, W. J. Llope, T. W. Ludlam, S. McCorkle, R. Majka, S. K. Mark, J. T. Mitchell, M. Muthuswamy, E. O'Brien, C. Pruneau, M. N. Rao, F. Rotondo, N. C. daSilva, U. Sonnadara, J. Stachel, H. Takai, E. M. Takagui, T. G. Throwe, G. Wang, D. Wolfe, C. L. Woody, N. Xu, Y. Zhang, Z. Zhang, C. Zou

Department of Physics

Research output: Contribution to journal › Article

50 Citations (Scopus)

Abstract

We present measurements of pion transverse momentum (p_t) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for p_t down to and including p_t = 0. The data exhibit an enhanced pion yield at low p_t compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

Original language	English
Pages (from-to)	93-98
Number of pages	6
Journal	Physics Letters B
Volume	351
Issue number	1-3
DOIs	https://doi.org/10.1016/0370-2693(95)00329-J
Publication status	Published - 1995 May 25

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Barrette, J., Bellwied, R., Braun-Munzinger, P., Cleland, W. E., Cormier, T. M., David, G., Dee, J., Diebold, G. E., Dietzsch, O., Germani, J. V., Gilbert, S., Greene, S. V., Hall, J. R., Hemmick, T. K., Herrmann, N., Hong, B., Jayananda, K., Kraus, D., Kumar, B. S., ... Zou, C. (1995). Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy. Physics Letters B, 351(1-3), 93-98. https://doi.org/10.1016/0370-2693(95)00329-J

Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy. / Barrette, J.; Bellwied, R.; Braun-Munzinger, P.; Cleland, W. E.; Cormier, T. M.; David, G.; Dee, J.; Diebold, G. E.; Dietzsch, O.; Germani, J. V.; Gilbert, S.; Greene, S. V.; Hall, J. R.; Hemmick, T. K.; Herrmann, N.; Hong, B.; Jayananda, K.; Kraus, D.; Kumar, B. S.; Lacasse, R.; Lissauer, D.; Llope, W. J.; Ludlam, T. W.; McCorkle, S.; Majka, R.; Mark, S. K.; Mitchell, J. T.; Muthuswamy, M.; O'Brien, E.; Pruneau, C.; Rao, M. N.; Rotondo, F.; daSilva, N. C.; Sonnadara, U.; Stachel, J.; Takai, H.; Takagui, E. M.; Throwe, T. G.; Wang, G.; Wolfe, D.; Woody, C. L.; Xu, N.; Zhang, Y.; Zhang, Z.; Zou, C.

In: Physics Letters B, Vol. 351, No. 1-3, 25.05.1995, p. 93-98.

Research output: Contribution to journal › Article

Barrette, J, Bellwied, R, Braun-Munzinger, P, Cleland, WE, Cormier, TM, David, G, Dee, J, Diebold, GE, Dietzsch, O, Germani, JV, Gilbert, S, Greene, SV, Hall, JR, Hemmick, TK, Herrmann, N, Hong, B, Jayananda, K, Kraus, D, Kumar, BS, Lacasse, R, Lissauer, D, Llope, WJ, Ludlam, TW, McCorkle, S, Majka, R, Mark, SK, Mitchell, JT, Muthuswamy, M, O'Brien, E, Pruneau, C, Rao, MN, Rotondo, F, daSilva, NC, Sonnadara, U, Stachel, J, Takai, H, Takagui, EM, Throwe, TG, Wang, G, Wolfe, D, Woody, CL, Xu, N, Zhang, Y, Zhang, Z & Zou, C 1995, 'Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy', Physics Letters B, vol. 351, no. 1-3, pp. 93-98. https://doi.org/10.1016/0370-2693(95)00329-J

Barrette, J. ; Bellwied, R. ; Braun-Munzinger, P. ; Cleland, W. E. ; Cormier, T. M. ; David, G. ; Dee, J. ; Diebold, G. E. ; Dietzsch, O. ; Germani, J. V. ; Gilbert, S. ; Greene, S. V. ; Hall, J. R. ; Hemmick, T. K. ; Herrmann, N. ; Hong, B. ; Jayananda, K. ; Kraus, D. ; Kumar, B. S. ; Lacasse, R. ; Lissauer, D. ; Llope, W. J. ; Ludlam, T. W. ; McCorkle, S. ; Majka, R. ; Mark, S. K. ; Mitchell, J. T. ; Muthuswamy, M. ; O'Brien, E. ; Pruneau, C. ; Rao, M. N. ; Rotondo, F. ; daSilva, N. C. ; Sonnadara, U. ; Stachel, J. ; Takai, H. ; Takagui, E. M. ; Throwe, T. G. ; Wang, G. ; Wolfe, D. ; Woody, C. L. ; Xu, N. ; Zhang, Y. ; Zhang, Z. ; Zou, C. / Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy. In: Physics Letters B. 1995 ; Vol. 351, No. 1-3. pp. 93-98.

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title = "Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy",

abstract = "We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.",

author = "J. Barrette and R. Bellwied and P. Braun-Munzinger and Cleland, {W. E.} and Cormier, {T. M.} and G. David and J. Dee and Diebold, {G. E.} and O. Dietzsch and Germani, {J. V.} and S. Gilbert and Greene, {S. V.} and Hall, {J. R.} and Hemmick, {T. K.} and N. Herrmann and B. Hong and K. Jayananda and D. Kraus and Kumar, {B. S.} and R. Lacasse and D. Lissauer and Llope, {W. J.} and Ludlam, {T. W.} and S. McCorkle and R. Majka and Mark, {S. K.} and Mitchell, {J. T.} and M. Muthuswamy and E. O'Brien and C. Pruneau and Rao, {M. N.} and F. Rotondo and daSilva, {N. C.} and U. Sonnadara and J. Stachel and H. Takai and Takagui, {E. M.} and Throwe, {T. G.} and G. Wang and D. Wolfe and Woody, {C. L.} and N. Xu and Y. Zhang and Z. Zhang and C. Zou",

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doi = "10.1016/0370-2693(95)00329-J",

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TY - JOUR

T1 - Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

AU - Barrette, J.

AU - Bellwied, R.

AU - Braun-Munzinger, P.

AU - Cleland, W. E.

AU - Cormier, T. M.

AU - David, G.

AU - Dee, J.

AU - Diebold, G. E.

AU - Dietzsch, O.

AU - Germani, J. V.

AU - Gilbert, S.

AU - Greene, S. V.

AU - Hall, J. R.

AU - Hemmick, T. K.

AU - Herrmann, N.

AU - Hong, B.

AU - Jayananda, K.

AU - Kraus, D.

AU - Kumar, B. S.

AU - Lacasse, R.

AU - Lissauer, D.

AU - Llope, W. J.

AU - Ludlam, T. W.

AU - McCorkle, S.

AU - Majka, R.

AU - Mark, S. K.

AU - Mitchell, J. T.

AU - Muthuswamy, M.

AU - O'Brien, E.

AU - Pruneau, C.

AU - Rao, M. N.

AU - Rotondo, F.

AU - daSilva, N. C.

AU - Sonnadara, U.

AU - Stachel, J.

AU - Takai, H.

AU - Takagui, E. M.

AU - Throwe, T. G.

AU - Wang, G.

AU - Wolfe, D.

AU - Woody, C. L.

AU - Xu, N.

AU - Zhang, Y.

AU - Zhang, Z.

AU - Zou, C.

PY - 1995/5/25

Y1 - 1995/5/25

N2 - We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

AB - We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

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