Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-12-16
Phys.Rev.Lett.99:152301,2007
Physics
Nuclear Physics
Nuclear Theory
4 pages, Revtex, 2 figures, revised figures and discussion
Scientific paper
10.1103/PhysRevLett.99.152301
Medium modification of dihadron fragmentation functions due to gluon bremsstrahlung induced by multiple partonic scattering is studied in both deep-inelastic scattering (DIS) off large nuclei and high-energy heavy-ion collisions within the same framework of twist expansion. The modified fragmentation functions for dihadrons are found to follow closely that of single hadrons leading to a weak nuclear suppression of their ratios as measured by HERMES in DIS experiments. Meanwhile, a moderate medium enhancement of the near-side correlation of two high transverse momentum hadrons with increasing centrality is found in heavy-ion collisions because of the trigger bias and the increase in parton energy loss with centrality. Successful comparisons between theory and experiment for multi-hadron observables in both confining and deconfined environments offers comprehensive evidence for partonic energy loss as the mechanism of jet modification in dense matter.
Majumder Abhijit
Wang Enke
Wang Xin-Nian
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