Measurement of Υ production for p+p and p+d interactions at 800GeV/c

L. Y. Zhu, P. E. Reimer, B. A. Mueller, T. C. Awes, M. L. Brooks, C. N. Brown, J. D. Bush, T. A. Carey, T. H. Chang, W. E. Cooper, C. A. Gagliardi, G. T. Garvey, D. F. Geesaman, E. A. Hawker, X. C. He, D. E. Howell, L. D. Isenhower, D. M. Kaplan, S. B. Kaufman, S. A. KlinksiekD. D. Koetke, D. M. Lee, W. M. Lee, M. J. Leitch, N. Makins, P. L. McGaughey, J. M. Moss, P. M. Nord, V. Papavassiliou, B. K. Park, G. Petitt, J. C. Peng, M. E. Sadler, W. E. Sondheim, P. W. Stankus, T. N. Thompson, R. S. Towell, R. E. Tribble, M. A. Vasiliev, J. C. Webb, J. L. Willis, P. Winter, D. K. Wise, Y. Yin, G. R. Young

Research output: Contribution to journalArticlepeer-review


We report a high statistics measurement of Υ production with an 800GeV/c proton beam on hydrogen and deuterium targets. The dominance of the gluon-gluon fusion process for Υ production at this energy implies that the cross section ratio, σ(p+d→Υ)/2σ(p+p→Υ), is sensitive to the gluon content in the neutron relative to that in the proton. Over the kinematic region 0<xF<0.6, this ratio is found to be consistent with unity, in striking contrast to the behavior of the Drell-Yan cross section ratio σ(p+d)DY/2σ(p+p)DY. This result shows that the gluon distributions in the proton and neutron are very similar. The Υ production cross sections are also compared with the p+d and p+Cu cross sections from earlier measurements.

Original languageEnglish (US)
Article number062301
JournalPhysical review letters
Issue number6
StatePublished - Feb 14 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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