Centrality dependence of inclusive J/psi production in p-Pb collisions at root S-NN=5.02TeV


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Adam J., Adamova D., Aggarwal M., Rinella G. A., Agnello M., Agrawal N., ...Daha Fazla

JOURNAL OF HIGH ENERGY PHYSICS, cilt.2015, sa.11, ss.1-33, 2015 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2015 Sayı: 11
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/jhep11(2015)127
  • Dergi Adı: JOURNAL OF HIGH ENERGY PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1-33
  • Anahtar Kelimeler: Quark gluon plasma, QCD, Heavy Ions, PROTON-NUCLEUS COLLISIONS, ENERGY-LOSS, J-PSI, SUPPRESSION
  • Bursa Uludağ Üniversitesi Adresli: Hayır

Özet

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 dielectron 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.