Medium-induced parton energy loss in {gamma}+jet events of high-energy heavy-ion collisions
- Nuclear Science Division, MS 70A-3307, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)
The effect of medium-induced parton energy loss on jet fragmentation is studied in high-energy heavy-ion collisions. It is shown that an effective jet fragmentation function can be extracted from the inclusive p{sub T} spectrum of charged particles in the opposite direction of a tagged direct photon with a fixed transverse energy. We study the modification of the effective jet fragmentation function due to parton energy loss in AA as compared to pp collisions, including E{sub T} smearing from initial-state radiations for the photon-tagged jets. The effective fragmentation function at z=p{sub T}/E{sub T}{sup {gamma}}{approximately}1 in pA collisions is shown to be sensitive to the additional E{sub T} smearing due to initial multiple parton scatterings whose effect must be subtracted out in AA collisions in order to extract the effective parton energy loss. Jet quenching in deeply inelastic lepton-nucleus scatterings as a measure of the parton energy loss in cold nuclear matter is also discussed. We also comment on the experimental feasibilities of the proposed study at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies and some alternative measurements such as using Z{sup 0} as a tag at the LHC energy. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098; FG03-93ER40792
- OSTI ID:
- 509106
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 55; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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