Measurement of Production for p+p and p+d Interactions at 800 GeV/c

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L. Y. Zhu,⁶ P. E. Reimer,^2,7 B. A. Mueller,² T. C. Awes,¹⁰ M. L. Brooks,⁷ C. N. Brown,³ J. D. Bush,¹ T. A. Carey,⁷ T. H. Chang,⁹ W. E. Cooper,³ C. A. Gagliardi,¹¹ G. T. Garvey,⁷ D. F. Geesaman,² E. A. Hawker,¹¹ X. C. He,⁴ D. E. Howell,⁶ L. D. Isenhower,¹ D. M. Kaplan,⁵ S. B. Kaufman,² S. A. Klinksiek,⁸ D. D. Koetke,¹² D. M. Lee,⁷ W. M. Lee,^3,4 M. J. Leitch,⁷ N. Makins,^2,6 P. L. McGaughey,⁷ J. M. Moss,⁷ P. M. Nord,¹² V. Papavassiliou,⁹ B. K. Park,⁷ G. Petitt,⁴ J. C. Peng,^6,7 M. E. Sadler,¹ W. E. Sondheim,⁷ P. W. Stankus,¹⁰ T. N. Thompson,⁷ R. S. Towell,¹ R. E. Tribble,¹¹ M. A. Vasiliev,¹¹ J. C. Webb,⁹ J. L. Willis,¹ P. Winter,² D. K. Wise,¹ Y. Yin,⁶ and G. R. Young¹⁰

(FNAL E866/NuSea Collaboration)

¹Abilene Christian University, Abilene, Texas 79699, USA
²Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
³Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
⁴Georgia State University, Atlanta, Georgia 30303, USA
⁵Illinois Institute of Technology, Chicago, Illinois 60616, USA
⁶University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
⁷Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁸University of New Mexico, Albuquerque, New Mexico 87131, USA
⁹New Mexico State University, Las Cruces, New Mexico 88003, USA
¹⁰Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
¹¹Texas A&M University, College Station, Texas 77843, USA
¹²Valparaiso University, Valparaiso, Indiana 46383, USA

Received 10 October 2007; published 14 February 2008

Wereport a high statistics measurement of Upsilon production with an800 GeV/c proton beam on hydrogen and deuterium targets. The dominanceof the gluon-gluon fusion process for Upsilon production at thisenergy implies that the cross section ratio, sigma (p+d --> Upsilon )/2 sigma (p+p --> Upsilon ), is sensitiveto the gluon content in the neutron relative to thatin the proton. Over the kinematic region 0<x_F<0.6, this ratiois found to be consistent with unity, in striking contrastto the behavior of the Drell-Yan cross section ratio sigma (p+d)_DY/2 sigma (p+p)_DY.This result shows that the gluon distributions in the protonand neutron are very similar. The Upsilon production cross sectionsare also compared with the p+d and p+Cu cross sectionsfrom earlier measurements.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.062301
DOI:	10.1103/PhysRevLett.100.062301
PACS:	25.40.-h; 13.85.Qk; 14.20.Dh; 24.85.+p 25.40.-h Nucleon-induced nuclear reactions 13.85.Qk Hadron-induced inclusive production with identified leptons, photons, or other nonhadronic particles (energy>10 GeV) 14.20.Dh Protons and neutrons 24.85.+p Quarks, gluons and QCD in nuclear reactions YEAR: 2008

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