Production of J/ψ and ψ(2S) mesons in π-Be collisions at 515 GeV/c

A. Gribushin, V. Abramov, Yu Antipov, B. Baldin, R. Crittenden, C. Davis, L. Dauwe, S. Denisov, A. Dyshkant, A. Dzierba, V. Glebov, H. Goldberg, R. Jesik, V. Koreshev, J. Krider, A. Krinitsyn, R. Li, S. Margulies, T. Marshall, J. MartinH. Mendez, A. Petrukhin, J. Solomon, V. Sirotenko, P. Smith, T. Sulanke, R. Sulyaev, F. Vaca, A. Ziemiński, S. Blusk, C. Bromberg, P. Chang, B. Choudhary, W. H. Chung, L. de Barbaro, W. Długosz, J. Dunlea, E. Engels, G. Fanourakis, G. Ginther, K. Hartman, J. Huston, V. Kapoor, C. Lirakis, S. Mani, J. Mansour, A. Maul, R. Miller, B. Y. Oh, E. Pothier, R. Roser, P. Shepard, D. Skow, P. Slattery, L. Sorrell, W. Toothacker, N. Varelas, D. Weerasundara, J. Whitmore, C. Yosef, M. Zieliński

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32 Scopus citations

Abstract

We have studied the production of J/ψ and ψ(2S) charmonium mesons in 515 GeV/c π-Be collisions in the Feynman-x range 0.1<xf<0.8. J/ψ mesons were detected via their decay into µ+µ-, and ψ(2S) mesons were studied in both the µ+µ- and J/ψ π+π- decay modes. J/ψ differential cross sections have been measured as functions of (formula presented)≳0.1. Our results are compared with those from other experiments performed at lower beam energies. We also measure the differential ψ(2S) cross section as a function of both (formula presented), and a ψ(2S) inclusive cross section of B(ψ(2S)→J/ψ(formula presented)Be→ψ(2S)+X)/A=[7. 4±1.5(stat)±1.2(syst)] nb/nucleon for ψ(2S) (formula presented)≳0.1. The fraction of the inclusive J/ψ yield due to ψ(2S) meson decays is 0.083±0.017(stat) ±0.013(syst), and the observed ratio of ψ(2S) decay rates is B(ψ(2S)→J/ψ(formula presented)) =30.2±7.2(stat)±6.8(syst). We have searched for production of “hidden” charm resonances decaying into either J/ψ(formula presented),ψ(2S)(formula presented), or J/ψ(formula presented) systems, and report an upper limit of 3.1 nb/nucleon for the product of branching ratio and cross section for the recently reported enhancement at a J/ψ(formula presented).

Original languageEnglish (US)
Pages (from-to)4723-4733
Number of pages11
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume53
Issue number9
DOIs
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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