THE EVOLUTION OF CROSS-SECTION RATIO PSI(')J PSI FROM P-A TO S-U INTERACTIONS - DIRECT PHOTON-EMISSION IN CORRELATION WITH PHI AND J/PSI/

Authors
ABREU MC BAGLIN C BALDIT A BARRIERE C BEDJIDIAN M BORDALO P BORHANI A BUSSIERE A CASTOR J CHAMBON T CHAURAND B CONTARDO D DESCROIX E DEVAUX A DRAPIER O ESPAGNON B FARGEIX J FLEURET F FORCE P GAGO J GERSCHEL C GONIN M GORODETZKY P GROSSIORD JY GUICHARD A GUILLAUD JP HAROUTUNIAN R JOUAN D KLUBERG L KOSSAKOWSKI R LANDAUD G LOURENCO C LUQUIN L MALEK F MANDRY R MAZINI R PIZZI JR RACCA C RAMOS S ROMANA A RONCEUX B SILVA S SONDEREGGER P TARRAGO X VARELA J
Citation
Mc. Abreu et al., THE EVOLUTION OF CROSS-SECTION RATIO PSI(')J PSI FROM P-A TO S-U INTERACTIONS - DIRECT PHOTON-EMISSION IN CORRELATION WITH PHI AND J/PSI/, Nuclear physics. A, 590(1-2), 1995, pp. 117-126
Citations number
14
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. A → ACNP
ISSN journal
03759474
Volume
590
Issue
1-2
Year of publication
1995
Pages
117 - 126
Database
ISI
SICI code
0375-9474(1995)590:1-2<117:TEOCRP>2.0.ZU;2-B
Abstract
J/psi and psi' production cross sections are studied for several proto n induced reactions and in S-U collisions, in the NA3S experiment, by measuring the resonances' decays in the muon pair channel. Whereas in p-A interactions the psi'/J/psi ratio remains constantin going from p- p and p-d collisions to p-W and p-U, with a mean value of 1.76% +/- 0. 04%, in the S-U data it exhibits half of this value and decreases as c entrality of the collision increases. Also studied are the differences between the gamma/pi degrees ratio yields correlated with the J/psi m ass range and other dimuon masses; no significant effect is seen.