Jet modification in three dimensional fluid dynamics at next-to-leading twist

The modification of the single inclusive spectrum of high transverse momentum (pT) pions emanating from an ultrarelativistic heavy-ion collision is investigated. The deconfined sector is modeled using a full three-dimensional (3-D) ideal fluid dynamics simulation. Energy loss of high pT partons and the ensuing modification of their fragmentation is calculated within perturbative QCD at next-to-leading twist, where the magnitude of the higher twist contribution is modulated by the entropy density extracted from the 3-D fluid dynamics simulation. The nuclear modification factor (RAA) for pions with a pT≥8 GeV as a function of centrality as well as with respect to the reaction plane is calculated. The magnitude of contributions to the differential RAA within small angular ranges, from various depths in the dense matter, is extracted from the calculation and demonstrates the correlation of the length integrated density and the RAA from a given depth. The significance of the mixed and hadronic phase to the overall magnitude of energy loss is explored. © 2007 The American Physical Society.

Duke Scholars

Author Steffen A. Bass Physics