Suppression of γ(1S), γ(2S), and γ(3S) quarkonium states in PbPb collisions at √SNN=2.76TeV
Yazarlar (1)
Prof. Dr. Hasan OĞUL Sinop Üniversitesi, Türkiye
Makale Türü Açık Erişim Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı Physics Letters Section B Nuclear Elementary Particle and High Energy Physics (Q1)
Dergi ISSN 0370-2693 Dergi Bilgileri (2017)
Makale Dili İngilizce Basım Tarihi 07-2017
Kabul Tarihi Yayınlanma Tarihi 01-07-2017
Cilt / Sayı / Sayfa 770 / 1 / 357–379 DOI 10.1016/j.physletb.2017.04.031
Makale Linki https://www.sciencedirect.com/science/article/am/pii/S0370269317303052
UAK Araştırma Alanları
Fen Bilimleri ve Matematik
Özet
The production yields of ϒ(1S), ϒ(2S), and ϒ(3S) quarkonium states are measured through their decays into muon pairs in the CMS detector, in PbPb and pp collisions at the centre-of-mass energy per nucleon pair of 2.76 TeV. The data correspond to integrated luminosities of 166μb−1 and 5.4pb−1 for PbPb and pp collisions, respectively. Differential production cross sections are reported as functions of ϒ rapidity y up to 2.4, and transverse momentum pT up to 20GeV/c. A strong centrality-dependent suppression is observed in PbPb relative to pp collisions, by factors of up to ≈2 and 8, for the ϒ(1S) and ϒ(2S) states, respectively. No significant dependence of this suppression is observed as a function of y or pT. The ϒ(3S) state is not observed in PbPb collisions, which corresponds to a suppression for the centrality-integrated data by at least a factor of ≈7 at a 95% confidence level. The observed suppression is in agreement with theoretical scenarios modeling the sequential melting of quarkonium states in a quark gluon plasma.
Anahtar Kelimeler
Bottomonia | CMS | Dimuons | Heavy ions | Physics