Multiple scattering, parton energy loss and modified fragmentation functions in deeply inelastic e A scattering - INSPIRE

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Multiple scattering, parton energy loss and modified fragmentation functions in deeply inelastic e A scattering

Xiao-feng Guo
(
- Kentucky U.
)
,
Xin-Nian Wang
(
- LBL, Berkeley
)

May, 2000

4 pages

Published in:

Phys.Rev.Lett. 85 (2000) 3591-3594

e-Print:

hep-ph/0005044 [hep-ph]

DOI:

10.1103/PhysRevLett.85.3591

Report number:

LBNL-45631,
LBL-45631

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Abstract: (arXiv)

Modified quark fragmentation functions in deeply inelastic

eA

collisions and their QCD evolution equations are derived for the first time in the framework of multiple parton scattering. Induced radiation gives rise to additional terms in the evolution equations and thus softens the modified quark fragmentation functions. The results in the next-leading-twist depend on both diagonal and off-diagonal twist-four parton distributions and the combination of which clearly manifests the LPM interference pattern. The predicted modification depends quadratically on the nuclear size (

A^{2/3}

). Generalization to the case of hot QCD medium is also discussed.

Note:

4 Pages in RevTex with 2 ps figures, final version in Phys. Rev. Lett

electron nucleus: deep inelastic scattering
electron nucleus: inclusive reaction
hadron: electroproduction
multiple scattering: parton
energy loss
fragmentation function
gluon: radiation
effect: higher-twist
numerical calculations

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