Charmonia production in 450 GeV/c proton induced reactions

Citation
Mc. Abreu et al., Charmonia production in 450 GeV/c proton induced reactions, PHYS LETT B, 444(3-4), 1998, pp. 516-522
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
444
Issue
3-4
Year of publication
1998
Pages
516 - 522
Database
ISI
SICI code
0370-2693(199812)444:3-4<516:CPI4GP>2.0.ZU;2-3
Abstract
Absolute J/psi and psi' production cross sections have been measured at the CERN SPS, with 450 GeV/c protons incident on a set of C. Al, Cu and W targ ets. Complementing these values with the results obtained by experiment NA5 1, which used the same beam and detector with H and D targets, we establish a coherent picture of charmonia production in proton-induced reactions at SPS energies. In particular, we show that the scaling of the J/psi cross se ction with the mass number of the target, A, is well described as A(alpha), with alpha(psi) = 0.919 +/- 0.015. The ratio between the J/psi and psi' yi elds, in our kinematical window, is found to be independent of A, with alph a(psi) - alpha(psi) = 0.014 +/- 0.011. (C) 1998 Elsevier Science B.V. All r ights reserved.