Speaker
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)
Description
Within a multiphase transport model, several experimental observables related to reconstructed jets, including the transverse momentum imbalance for photon-jet, transverse momentum asymmetry for dijet, jet fragmentation function, jet shape, and jet flow, are investigated in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Because the imbalance ratio between photon and jet is sensitive to both production position and passing direction of photon, it could enable a detail tomographic study on the hot partonic medium by selecting different imbalance ratio ranges [1]. Dijet asymmetry evolution functions disclose that final dijet asymmetry is driven by both initial dijet asymmetry and partonic jet energy loss [2]. The measured jet fragmentation function in Pb+Pb collisions is decomposed into two parts from jet fragmentation and coalescence, which indicates a competition between the two jet hadronization mechanisms that dominate different $\xi$=ln(1/$z$) ranges and different centrality bins [3]. The subleading jet shape displays a larger medium modification than the leading jet shape, especially in more central Pb+Pb collisions with a larger dijet asymmetry [4]. Azimuthal anisotropies (or flows) of jets ($v_2$ and $v_3$) are sensitive to the geometry asymmetry of initial partonic distribution, which is consistent with a path-length dependence of jet energy loss in the QGP [5]. All these results support that jets lose much energy owing to the strong interactions between jets and a hot partonic medium.
References:
[1]Guo-Liang Ma, Phys. Lett. B, 724 (2013) 278 [arXiv: 1302.5873].
[2]Guo-Liang Ma, Phys. Rev. C, 87 (2013) 064901 [arXiv: 1304.2841].
[3]Guo-Liang Ma, Phys. Rev. C, 88, (2013) 021902(R) [arXiv: 1306.1306].
[4]Guo-Liang Ma, Phys. Rev. C, 89 (2014) 024902 [arXiv: 1309.5555].
[5]Mao-Wu Nie and Guo-Liang Ma, in preparation.
Primary author
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)