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1–5 Sep 2017
China National Convention Center
Asia/Shanghai timezone

Measurements of J/ψ production and polarization in p+p and p+Au collisions at √sNN = 200 GeV with the STAR experiment

1 Sep 2017, 17:40
20m
302A (China National Convention Center)

302A

China National Convention Center

No.7 Tianchen East Road, Chaoyang District, Beijing 100105 China
1) Hot and dense matter physics (QGP and heavy ion collision) Hot and dense matter physics (QGP and heavy ion collision)

Speaker

Zhen LIU (University of Science and Technology of China)

Description

Quarkonium production is an important tool to study the properties of the Quark-Gluon Plasma (QGP) formed in relativistic heavy-ion collisions. In particular, suppression of the J/ψ meson production due to the color screening effect in the medium was proposed as a direct evidence of the QGP formation. However, interpretation of the J/ψ suppression measured in heavy-ion collisions is still challenging due to the presence of other effects, such as the regeneration contribution from the coalescence of deconfined c and c quarks as well as the cold nuclear matter effects. By comparing J/ψ production cross-sections in p+p and p+Au collisions, the cold nuclear matter effects can be studied in detail. Moreover, J/ψ polarization is sensitive to the J/ψ production mechanism, and its measurement can help distinguish among different models. During the RHIC 2015 run, the STAR experiment recorded large samples of p+p and p+Au collisions at √sNN = 200 GeV for charmonium studies via the dimuon decay channel. In this talk, we will present measurements of the nuclear modification factor for J/ψ over a broad kinematic range in p+Au collisions, to quantify the cold nuclear matter effects. The double ratio of ψ(2S) to J/ψ production rates between p+p and p+Au collisions at mid-rapidity is measured for the first time, to study possible different final-state effects on different charmonium states. Furthermore, we will discuss the analysis status of J/ψ polarization measurements in both p+p and p+Au collisions.

Presentation materials