Measurements of J/ψ → e+e? with ALICE at the LHC

14th International Conference on Strangeness in Quark Matter

Fionda, Fiorella^1

Dipartimento Interateneo di Fisica M. Merlin, Sezione INFN, Bari, Italy^1

关键词: Heavy ion collision;    Large Hadron collider LHC;    Measurements of;    Nuclear matters;    Nuclear modification;    Nuclear modification factors;    Pb-Pb collisions;    Quark-gluon plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012110/pdf
DOI  :  10.1088/1742-6596/509/1/012110

来源: IOP

【 摘 要 】

The ALICE detector provides excellent capabilities to study quarkonium production at the Large Hadron Collider (LHC). Heavy quarkonia, bound states of charm or beauty quark anti-quark pairs such as the Jψψ, are expected to be produced by initial hard processes. Thus they will provide insight into the earliest and hottest stages of AA collisions where the formation of a Quark-Gluon Plasma (QGP) is expected. Furthermore, high-precision data from pp collisions represent an essential baseline for the measurement of nuclear modifications in heavy-ion collisions and serve also as a crucial test for several models of quarkonium hadroproduction. In addition, the study of pA collisions allows to investigate nuclear modifications due to Cold Nuclear Matter (CNM) effects. In ALICE, Jψψ were measured in pp and Pb-Pb collisions down to pT0 via their di-electron decay channel in the central barrel (|y| AA) at central rapidities in Pb-Pb collisions at 2.76 TeV will be shown and their implications discussed. A separation of the prompt and non-prompt components is also possible down to pTof the Jψψ of 2 GeV/c.