Jet quenching in mini-quark-gluon plasma: Medium modification factor IpA for photon-tagged jets
B. G. Zakharov
L. D. Landau Institute for Theoretical Physics, 117334 Moscow, Russia
We calculate the medium modification factor IpA
for the photon-tagged jet fragmentation functions
for scenario with the quark-gluon plasma formation
in pA and pp collisions.
We perform calculations of radiative and collisional parton
energy loss in the quark-gluon plasma
with running αs which has a plateau around
with κ fitted to the LHC data on the heavy ion RAA.
We find that the theoretical predictions for IpA
in 5.02 TeV p + Pb collisions
are within errors consistent with the data from ALICE [ALICE_IpA].
However, a definite conclusion about the presence or absence of jet
in pA collisions
cannot be drawn due to large experimental errors of the ALICE data
Our calculations show that this requires a significantly more accurate
measurement of IpA.