Inclusive J/psi and psi ' production in pi(-) -nucleus interactions at root s similar or equal to 26 GeV

Citation
Y. Alexandrov et al., Inclusive J/psi and psi ' production in pi(-) -nucleus interactions at root s similar or equal to 26 GeV, NUCL PHYS B, 557(1-2), 1999, pp. 3-21
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B
ISSN journal
0550-3213 → ACNP
Volume
557
Issue
1-2
Year of publication
1999
Pages
3 - 21
Database
ISI
SICI code
0550-3213(19990920)557:1-2<3:IJAP'P>2.0.ZU;2-X
Abstract
Charmonium production by 350 GeV/c negative pions incident on tungsten, cop per and silicon has been studied in the WA92 experiment. J/psi and psi' mes ons 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 meas ured. 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/ps i 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 bet ween 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.