J/ψ and ψ′ production at the CERN p̄p collider

C. Albajar, M. G. Albrow, O. C. Allkofer, K. Ankoviak, R. Apsimon, B. Aubert, C. Bacci, S. Bartha, G. Bauer, A. Bettini, A. Bezaguet, P. Biddulph, H. Bohn, A. Böhrer, R. Bonino, K. Bos, M. Botlo, D. Brockhausen, C. Buchanan, B. BuschbeckG. Busetto, A. Caner, P. Casoli, H. Castilla-Valdez, F. Cavanna, P. Cennini, S. Centro, F. Ceradini, G. Ciapetti, S. Cittolin, E. Clayton, D. Cline, J. Colas, R. Conte, J. A. Coughlan, D. Dau, D. Daum, M. Della Negra, M. Demoulin, D. Denegri, H. Dibon, A. DiCiaccio, F. J. Diez Hedo, L. Dobrzynzki, J. Dorenbosch, J. D. Dowell, D. Drijard, K. Eggert, E. Eisenhandler, N. Ellis

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Abstract

We have measured the production cross-section times branching ratio for J/ψ→μ+μ- in pp̄ interactions at √s = 630 GeV in the kinematic range |y|<2.0 and pT>5 GeV/c, BR(J/ψ→μ+μ-)σ(p p ̄→J/ψ)=6.18±0.24±0.81 nb. The data sample collected in 1988 and 1989 for an integrated luminosity of 4.7 pb-1 represents a fivefold improvement over the statistics in our earlier study of the J/ψ production process, and the pT distribution which is measured extends to 28 GeV/c. Using event topology we show that the rate for the direct production of J/ψ, via radiative decays of χ states, is larger than that for production via B-hadrons. Production of ψ′ is also studied using the decay modes <ψ′→μ+μ- and ψ′→J/ψπ+ψ-.

Original languageEnglish (US)
Pages (from-to)112-120
Number of pages9
JournalPhysics Letters B
Volume256
Issue number1
DOIs
StatePublished - Feb 28 1991

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