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 journalArticle


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
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Measurement of Υ production for p+p and p+d interactions at 800GeV/c'. Together they form a unique fingerprint.

  • Cite this

    Zhu, L. Y., Reimer, P. E., Mueller, B. A., Awes, T. C., Brooks, M. L., Brown, C. N., Bush, J. D., Carey, T. A., Chang, T. H., Cooper, W. E., Gagliardi, C. A., Garvey, G. T., Geesaman, D. F., Hawker, E. A., He, X. C., Howell, D. E., Isenhower, L. D., Kaplan, D. M., Kaufman, S. B., ... Young, G. R. (2008). Measurement of Υ production for p+p and p+d interactions at 800GeV/c. Physical review letters, 100(6), [062301].