Hadroproduction of the chi(1) and chi(2) states of charmonium in 800-GeV/cproton-silicon interactions - art. no. 032006

Citation
T. Alexopoulos et al., Hadroproduction of the chi(1) and chi(2) states of charmonium in 800-GeV/cproton-silicon interactions - art. no. 032006, PHYS REV D, 6203(3), 2000, pp. 2006
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6203
Issue
3
Year of publication
2000
Database
ISI
SICI code
0556-2821(20000801)6203:3<2006:HOTCAC>2.0.ZU;2-8
Abstract
The cross sections for the hadroproduction of the chi(1) and chi(2) states of charmonium in proton-silicon collisions at root s = 38.8 GeV have been m easured in Fermilab fixed target experiment 771. The chi states were observ ed via their radiative decay to J/psi gamma, where the photon converted to e(+)e(-) i(n) the material of the spectrometer. The estimated values for th e chi(1) and chi(2) cross sections for x(F) > 0 are 263 +/- 69(stat) +/- 32 (syst) and 498 +/- 143(stat) +/- 67(syst) nb per nucleon, respectively. The resulting sigma(chi(1))/sigma(chi(2)) ratio of 0.53 +/- 0.20(stat) +/- 0.0 7( syst), although somewhat larger than most theoretical expectations, can be accommodated by the latest theoretical estimates.