Charmonium production by 350 GeV/c negative pions incident on tungsten, copper and silicon has been studied in the WA92 experiment. J/psi and psi' mesons are identified through their decays into muon pairs and are selected in the Feynman-x range x(F) > 0. Inclusive J/psi and psi' cross-sections and J/psi differential cross-sections as functions of x(F) and p(T)(2) are measured. Assuming the relation sigma = sigma(0) A(a) between the nuclear cross-section, sigma, and the atomic mass, A, of a target nucleus, a fit to J/psi data for different targets yields alpha = 0.87 +/- 0.05 +/- 0.04. Taking alpha = 0.87, the cross-sections per nucleon for J/psi and psi' are sigma(0)(J/psi) = 216 +/- 5 +/- 13 nb and sigma(0)(psi') = 28 +/- 8 +/- 11 nb, and their ratio is sigma(0)(psi') / sigma(0)(J/psi) = 0.13 +/- 0.05 +/- 0.01. The measurements of charmonium production are compared with results on open-charm production previously obtained in the same experiment. The ratio between the J/psi cross-section and the charmed-meson cross-section, relating to the same experimental conditions, is found to be sigma(0)(J/psi) /sigma(0)(D (D) over bar) = (1.75 +/- 0.05 +/- 0.15) x 10(-2). (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Inclusive J/psi and psi ' production in pi(-) -nucleus interactions at root s similar or equal to 26 GeV / Y., Alexandrov; C., Angelini; D., Barberis; F., Ceradini; M., Dameri; G., Darbo; A., Duane; V., Flaminio; A., Forino; B. R., French; A., Frenkel; C., Gemme; K., Harrison; R., Hurst; C., Lazzeroni; L., Malferrari; G., Martellotti; P., Mazzanti; B., Osculati; Penso, Gianni; L., Rossi; M., Verzocchi; D. M., Websdale; M., Zavertyaev. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - 557(1999), pp. 3-21.
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Titolo: | Inclusive J/psi and psi ' production in pi(-) -nucleus interactions at root s similar or equal to 26 GeV | |
Autori: | ||
Data di pubblicazione: | 1999 | |
Rivista: | ||
Citazione: | Inclusive J/psi and psi ' production in pi(-) -nucleus interactions at root s similar or equal to 26 GeV / Y., Alexandrov; C., Angelini; D., Barberis; F., Ceradini; M., Dameri; G., Darbo; A., Duane; V., Flaminio; A., Forino; B. R., French; A., Frenkel; C., Gemme; K., Harrison; R., Hurst; C., Lazzeroni; L., Malferrari; G., Martellotti; P., Mazzanti; B., Osculati; Penso, Gianni; L., Rossi; M., Verzocchi; D. M., Websdale; M., Zavertyaev. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - 557(1999), pp. 3-21. | |
Handle: | http://hdl.handle.net/11573/407671 | |
Appartiene alla tipologia: | 01a Articolo in rivista |