V Khachatryan, AM Sirunyan, A Tumasyan, W Adam… - Physical review …, 2014 - APS
The ratio between the prompt ψ (2 S) and J/ψ yields, reconstructed via their decays into μ+ μ-
, is measured in Pb-Pb and pp collisions at s NN= 2.76 TeV. The analysis is based on Pb-Pb …