Measurement of the photon structure function F2γ(x, Q2) in the region 0.2<Q2<7 GeV2

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. DahlK. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, W. Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G.J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A.J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C.S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, W. M. Zhang

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Abstract

We present a measurement of the photon structure function F2γ in the reaction ee→eeX for Q2 in the range 0.2<Q2<7 GeV2, using 9,200 multihadron events obtained with the TPC/Two-Gamma detector at PEP. The data have been corrected for detector effects using a regularized unfolding procedure and are presented as a function of x and Q2. The structure function shows scaling in the region 0.3<Q2<1.6 GeV2, x<0.3 and rises for higher Q2. At Q2=5.1 GeV2 the results are compared with QCD and, within the scheme of Antoniadis and Grunberg, rather conservative bounds for the QCD scale parameter of 133±50< {Mathematical expression}<268±98 MeV are obtained. A study of the final state structure shows that the rise of F2γ is consistent with being entirely due to the pointlike component of the photon.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalZeitschrift für Physik C Particles and Fields
Volume34
Issue number1
DOIs
Publication statusPublished - 1987 Mar

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Aihara, H., Alston-Garnjost, M., Avery, R. E., Barbaro-Galtieri, A., Barker, A. R., Barnes, A. V., Barnett, B. A., Bauer, D. A., Bengtsson, H. U., Bintinger, D. L., Bobbink, G. J., Bolognese, T. S., Bross, A. D., Buchanan, C. D., Buijs, A., Caldwell, D. O., Clark, A. R., Cowan, G. D., Crane, D. A., ... Zhang, W. M. (1987). Measurement of the photon structure function F2γ(x, Q2) in the region 0.2<Q2<7 GeV2. Zeitschrift für Physik C Particles and Fields, 34(1), 1-13. https://doi.org/10.1007/BF01561108