Speaker
Ms
Man Xie
(Central China Normal University)
Description
Under the assumption that a quark-gluon plasma droplet is produced in $p$+A collisions, $\gamma$-triggered hadron spectra are studied within a next-to-leading-order perturbative QCD parton model with the medium-modified parton fragmentation functions in $p$+Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV.
The initial conditions and space-time evolution of the small system of hot and dense medium is simulated by superSONIC hydrodynamic model and parton energy loss in such a medium is described by the high-twist (HT) approach.
The scaled jet transport coefficient $\hat{q}/T^3$ in this HT approach is extracted from single hadron suppression in central A+A collisions with similar initial medium temperature as in $p$+A collisions.
Numerical results for this scenario show that $\gamma$-hadron spectra at $p_{\rm T}^\gamma=12-40$ GeV/$c$ are suppressed by 5-15% in the most central 0-10% $p$+Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV.
The suppression becomes weaker at higher transverse momentum of the $\gamma$ trigger. As a comparison, $\gamma$-hadron suppression in Pb+Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ and 5.02 TeV is also predicted.
Furthermore, as a bridge between large system of heavy A+A collisions and small system of $p$+A collisions, $\gamma$-hadron suppression in light nucleus O+O collisions at $\sqrt{s_{\rm NN}}=7$ TeV is also studied.
Primary authors
Mr
Han-Zhong Zhang
(CCNU)
Ms
Man Xie
(Central China Normal University)
Prof.
Xin-Nian Wang
(Central China Normal University/Lawrence Berkeley National Laboratory)
