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The 62th HENPIC Seminar: Nuclear modification factor and elliptic flow of open heavy flavors in Pb-Pb collisions with ALICE at the LHC

Thursday, August 10, 2017, 15:00 PM (Beijing time)  seminar

Nuclear modification factor and elliptic flow of open heavy flavors in Pb-Pb collisions with ALICE at the LHC

Speaker:  Dr. Xiaoming Zhang (undefinedamp;#24352;undefinedamp;#26195;undefinedamp;#26126;undefinedamp;#65289;,Central China Normal University (CCNU)

Date:Thursday, August 10, 2017, 15:00 PM (Beijing time)



The LHC heavy-ion physics program aims at investigating the properties of the Quark-Gluon Plasma, QGP, formed in such collisions. Heavy quarks (charm and beauty) are regarded as efficient probes to study and characterize the QGP, as they are created on a very short time scale in initial hard processes and subsequently experience the entire system evolution interacting with the medium constituents.

The measured of the nuclear modification factor, $R_{AA}$, of heavy-flavor particles gives important information about the color-charge and parton-mass dependence of the energy loss as well as about possible modifications of heavy-quark hadronization in the medium. In addition, the heavy-flavor elliptic flow, $v_2$, provides insights on the degree of thermalization of heavy quarks in the deconfined medium and carries information on the path-length dependence of parton energy loss, in the low- and high-$p_T$ regions, respectively.

The heavy-flavor particles are measured in ALICE over a wide rapidity range, via D mesons and heavy-flavor hadron decay electrons at mid-rapidity (|y|<0.8), and heavy-flavor hadron decay muons at forward rapidity (2.5<y<4).

In this talk, the latest results on the $p_T$-differential $R_{AA}$ and $v_2$ of D mesons and heavy-flavor decay leptons in Pb-Pb collisions at $sqrt(s_{NN})$=5.02 and 2.76 TeV performed with ALICE will be presented for different centrality classes and compared with theoretical model predictions. The results in different rapidity regions provide further information on the properties of the medium. The leptons and high-$p_T$ come mainly from beauty-hadron decays, therefore they are sensitive to transport properties of beauty quarks in the medium. Finally, the results obtained with the Event-Shape Engineering (ESE) technique applied to the D-meson elliptic flow in semi-central Pb-Pb events to investigate the influence of initial geometry fluctuations to heavy-flavor production will be shown.

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