Centrality, rapidity and transverse momentum dependence of J/ψ suppression in Pb-Pb collisions at √sNN= 2.76TeV
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.734, ss.314-327, 2014 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 734
- Basım Tarihi: 2014
- Doi Numarası: 10.1016/j.physletb.2014.05.064
- Dergi Adı: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.314-327
- Anahtar Kelimeler: Experimental results, J/ψ suppression, Quark gluon plasma, Quarkonium, Relativistic heavy ion collisions
- Yıldız Teknik Üniversitesi Adresli: Hayır
Özet
The inclusive J/ψ nuclear modification factor (RAA) in Pb-Pb collisions at √sNN=2.76TeV has been measured by ALICE as a function of centrality in the e +e - decay channel at mid-rapidity (|y| < 0.8) and as a function of centrality, transverse momentum and rapidity in the μ +μ - decay channel at forward-rapidity (2.5 < y < 4). The J/ψ yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions. The RAA integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 ± 0.06(stat.) ± 0.10(syst.) at mid-rapidity and 0.58 ± 0.01(stat.) ± 0.09(syst.) at forward-rapidity. At low transverse momentum, significantly larger values of RAA are measured at forward-rapidity compared to measurements at lower energy. These features suggest that a contribution to the J/ψ yield originates from charm quark (re)combination in the deconfined partonic medium. © 2014 The Authors.