gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions

Details gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions

2009-04-24

arxiv.org/abs/0904.3806v1

Phys.Rev.C80:014901,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 1 figure

Scientific paper

10.1103/PhysRevC.80.014901

High transverse momentum (P_T) gamma-hadron correlations are currently being regarded as the 'golden channel' for the study of the medium produced in ultrarelativistic heavy ion collisions by means of hard probes. This is due to several reasons, all linked to the fact that because of the smallness of the electromagnetic coupling alpha, the photon does not substantially interact with the medium and is expected to escape unmodified. Thus, a high P_T photon indicates a hard process in the collision independent of the position of the hard vertex. In contrast, there may not be a clear signal for a hard process involving strongly interacting partons if the production vertex is deep in the medium as both partons undergo substantial final state interaction. Equally important, if photon production by fragmentation can be separated experimentally, the photon provides almost full knowledge of the initial kinematics. In the present paper, these properties are used to demonstrate a distinguishing feature between two assumptions made in modelling the medium-modifications of strongly interacting high P_T processes: Loss of energy into the medium vs. medium modification of the partonic shower. Is it shown that gamma-hadron correlations provide a very clean signature to distinguish the two scenarios.

Affiliated with

Also associated with

No associations

Rating

gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-609293