6533b7d2fe1ef96bd125edc2
RESEARCH PRODUCT
Energy loss in a fluctuating hydrodynamical background
Kari J. EskolaKari J. EskolaJussi AuvinenJussi AuvinenThorsten RenkThorsten RenkHannu HolopainenHannu Holopainensubject
PhysicsNuclear and High Energy PhysicsParticle physicsta114Degree (graph theory)010308 nuclear & particles physicsPlane (geometry)Elliptic flowOrder (ring theory)FOS: Physical sciences01 natural sciencesNuclear physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesRadiative transfer010306 general physicsRelativistic Heavy Ion ColliderEccentricity (mathematics)Nuclear ExperimentEvent (particle physics)description
Recently it has become apparent that event-by-event fluctuations in the initial state of hydrodynamical modelling of ultrarelativistic heavy-ion collisions are crucial in order to understand the full centrality dependence of the elliptic flow coefficient v_2. In particular, in central collisions the density fluctuations play a major role in generating the spatial eccentricity in the initial state. This raises the question to what degree high P_T physics, in particular leading-parton energy loss, which takes place in the background of an evolving medium, is sensitive to the presence of the event-by-event density fluctuations in the background. In this work, we report results for the effects of fluctuations on the nuclear modification factor R_AA in both central and noncentral sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC. Two different types of energy-loss models, a radiative and an elastic, are considered. In particular, we study the dependence of the results on the assumed spatial size of the density fluctuations, and discuss the angular modulation of R_AA with respect to the event plane.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-05-13 |