Speaker
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)
Description
We show that the incoherent elastic scattering of partons, as present in a multi-phase transport model (AMPT), with a modest parton-parton cross-section of $\sigma=1.5-3$ mb, naturally explains the long-range two-particle azimuthal correlation as observed in proton-proton, proton-nucleus and nucleus-nucleus collisions at the Large Hadron Collider. We calculate the elliptic, $v_2$, and triangular, $v_3$, Fourier coefficients of the two-particle azimuthal correlation function in proton-nucleus (p+Pb) and peripheral nucleus-nucleus (Pb+Pb) collisions. Our results for $v_3$ are in a good agreement with the CMS data. The $v_2$ coefficient is very well described in p+Pb collisions and is underestimated for higher transverse momenta in Pb+Pb collisions. The characteristic mass ordering of $v_2$ in p+A is reproduced whereas for $v_3$ such ordering is not observed. Our results indicates an emergence of collectivity in p+p, p+Pb and peripheral Pb+Pb collisions from parton scatterings.
References:
[1] Guo-Liang Ma and Adam Bzdak, arXiv:1404.4129.
[2] Adam Bzdak and Guo-Liang Ma, in preparation.
Primary author
Guo-Liang Ma
(Shanghai INstitute of Applied Physics (SINAP), CAS)
