Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 60, Issue 4, Pages 525-542Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-009-0965-7
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Funding
- Foundation for Fundamental Research on Matter (FOM), GA Utrecht, The Netherlands [3502]
- CICYT [AEN99-0483]
- German Research Foundation
- Graduate College GRK [271/3]
- Bundesministerium fur Bildung und Forschung, FRG [05-7BU35I, 05-7DO55P, 05-HB1HRA, 05-HB1KHA, 05-HB1PEA, 05-HB1PSA, 05-HB1VHA, 05-HB9HRA, 05-7HD15I, 05-7MP25I, 05-7SI75I]
- US Department of Energy (DOE)
- Portuguese Fundacao para a Ciencia e Tecnologia
- Danish Natural Science Research Council
- National Academy of Science
- Ministry of Education and Science of Ukraine
- Ministry of Education, Science and Sport of the Republic of Slovenia [P1-135, J1-6584-0106]
- US National Science Foundation [PHY-9986703]
- Russian Ministry of Education and Science [SS-1722.2003.2]
- BMBF via the Max Planck Research Award
- Norwegian Research Council
- Swiss National Science Foundation
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Measurements of the kinematic distributions of J/psi mesons produced in p-C, p-Ti and p-W collisions at root s = 41.6 GeV in the Feynman-x region -0.34 < x(F) < 0.14 and for transverse momentum up to p(T) = 5.4 GeV/c are presented. The xF and pT dependencies of the nuclear suppression parameter, a, are also given. The results are based on 2.4 x 10(5) J/psi mesons reconstructed in both the e(+) e(-) and mu(+) mu(-) decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of xF for the first time. The average value of a in the measured xF region is 0.981 +/- 0.015. The data suggest that the strong nuclear suppression of J/psi production previously observed at high xF turns into an enhancement at negative x(F)
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