Centrality dependence of inclusive J/psi production in p-Pb collisions at root S-NN=5.02TeV
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Abstract
We present a measurement of inclusive J/psi production in p-Pb
collisions at root S-NN = 5.02 TeV as a function of the centrality of
the collision, as estimated from the energy deposited in the Zero Degree
Calorimeters. The measurement is performed with the ALICE detector down
to zero transverse momentum, p(T), in the backward (-4.46 < y(cms) <
-2.96) and forward (2.03 < y(cms) < 3.53) rapidity intervals in the
dimuon decay channel and in the mid-rapidity region (-1.37 < y(cms) <
0.43) in the diielectron decay channel. The backward and forward rapidity
intervals correspond to the Pb-going and p-going direction,
respectively. The p(T)-differential J/psi production cross section at
backward and forward rapidity is measured for several centrality
classes, together with the corresponding average p(T) and p(T)(2)
values. The nuclear modification factor is presented as a function of
centrality for the three rapidity intervals, and as a function of p(T)
for several centrality classes at backward and forward rapidity. At
mid-and forward rapidity, the J/psi yield is suppressed up to 40\%
compared to that in pp interactions scaled by the number of binary
collisions. The degree of suppression increases towards central p-Pb
collisions at forward rapidity, and with decreasing p(T) of the J/psi.
At backward rapidity, the nuclear modification factor is compatible with
unity within the total uncertainties, with an increasing trend from
peripheral to central p-Pb collisions.... Show more Show less