Measurement of differences between J/psi and psi(') suppression in p-A collisions
Measurements of the suppression of the yield per nucleon of J/psi and psi(') production for 800 GeV/ c protons incident on heavy nuclear targets, relative to light nuclear targets, have been made with very broad coverage in x(F) and p(T). The observed suppression is smallest at x(F) values of 0.25 and below, and increases at larger values of x(F). It is also strongest at small p(T). Substantial differences between psi(') and J/psi production are observed for the first time in p-A collisions. The suppression for psi(') production is stronger than that for J/psi for x(F) near zero, but becomes comparable to that for J/psi for x(F)>0.6.
Leitch
MJ
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Lee
WM
Beddo
ME
Brown
CN
Carey
TA
Chang
TH
Cooper
WE
Gagliardi
CA
Garvey
GT
Geesaman
DF
Hawker
EA
He
XC
Isenhower
LD
Kaplan
DM
Kaufman
SB
Koetke
DD
McGaughey
PL
Moss
JM
Mueller
BA
Papavassiliou
V
Peng
JC
Petitt
G
Reimer
PE
Sadler
ME
Sondheim
WE
Stankus
PW