Production of Charmonium States in π- Be Collisions at 515 GeV/c

V. Koreshev, R. Jesik, H. Mendez, V. Abramov, Yu Antipov, B. Baldin, R. Crittenden, C. Davis, L. Dauwe, S. Denisov, A. Dyshkant, A. Dzierba, V. Glebov, H. Goldberg, A. Gribushin, J. Krider, A. Krinitsyn, R. Li, S. Margulies, T. MarshallJ. Martin, A. Petrukhin, J. Solomon, V. Sirotenko, P. Smith, T. Sulanke, R. Sulyaev, F. Vaca, L. Ziemiński, A. Apanasevich, J. Bacigalupi, M. Begel, Steven Roy Blusk, C. Bromberg, P. Chang, B. Choudhary, W. H. Chung, L. De Barbaro, W. Dhigosz, J. Dunlea, E. Engels, G. Fanourakis, G. Ginther, K. Hartman, J. Huston, V. Kapoor, C. Lirakis, S. Mani, J. Mansour, A. Maul, R. Miller, G. Osborne, D. Pellett, E. Pothier, R. Roser, P. Shepard, D. Skow, P. Slattery, L. Sorrell, D. Striley, N. Varelas, D. Weerasundara, C. Yosef, M. Zieliński, V. Zutshi

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Abstract

We report on χc1 and χc2 production in the Feynman-x range 0.1 < xF < 0.8 in 515 GeV/c π- Be collisions. The χc states are observed via their radiative decays into J/Ψ's. The resulting photons are detected either as showers in the electromagnetic calorimeter or after conversion in the target as e+ e- pairs in the tracking system. The fraction of J/Ψ production due to χc1 and χc2 decays is 0.443 ± 0.041 ± 0.035. The ratio of the χc1 to χc2 cross section is 0.57 ± 0.18 ± 0.06. Our results on J/Ψ, Ψ(2S), and χc production indicate that 0.454 ± 0.044 ± 0.042 of J/Ψ's are produced directly.

Original languageEnglish (US)
Pages (from-to)4294-4297
Number of pages4
JournalPhysical Review Letters
Volume77
Issue number21
StatePublished - 1996
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Koreshev, V., Jesik, R., Mendez, H., Abramov, V., Antipov, Y., Baldin, B., Crittenden, R., Davis, C., Dauwe, L., Denisov, S., Dyshkant, A., Dzierba, A., Glebov, V., Goldberg, H., Gribushin, A., Krider, J., Krinitsyn, A., Li, R., Margulies, S., ... Zutshi, V. (1996). Production of Charmonium States in π- Be Collisions at 515 GeV/c. Physical Review Letters, 77(21), 4294-4297.