We set tight constraints on the energy loss of hard quarks in nuclear matter from NA3 Drell-Yan measurements. Our estimate then allows for the description of HERMES preliminary deep inelastic scattering data on hadron production.
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[Show abstract][Hide abstract] ABSTRACT: The multiple scatterings incurred by a hard quark produced in a nuclear
medium induce the emission of soft gluons which carry a fraction of the quark
energy and eventually affect the hadronization process. Here, the depletion of
semi-inclusive hadron spectra in DIS on various nuclei (N, Ne, Cu, Kr) is
computed as a function of nu and z to leading order in alpha_s through
medium-modified fragmentation functions. Using the transport coefficient q
previously determined from Drell-Yan production, the predictions are found to
be in good agreement with EMC and HERMES preliminary data. Calculations on Xe
targets are also presented and discussed.
Preview · Article · Jun 2003 · European Physical Journal C
[Show abstract][Hide abstract] ABSTRACT: Recent results from HERMES in the hadron leptoproduction of nuclei are presented. The possible interpretations in terms of medium modifications of the parton fragmentation function and the implications on the parton energy loss are discussed.
Preview · Article · Dec 2003 · Journal of Physics G Nuclear and Particle Physics
[Show abstract][Hide abstract] ABSTRACT: The influence of the nuclear medium on lepto-production of hadrons was studied in the HERMES experiment at DESY in semi-inclusive deep-inelastic scattering of 27.6 GeV positrons off deuterium, nitrogen and krypton targets. The differential multiplicity for krypton relative to that of deuterium has been measured for the first time for various identified hadrons (π+, π−, π0, K+, K−, p and ) as a function of the virtual photon energy ν, the fraction z of this energy transferred to the hadron, and the hadron transverse momentum squared p2t. The distribution of the hadron transverse momentum is broadened towards high p2t in the nuclear medium, in a manner resembling the Cronin effect previously observed in collisions of heavy ions and protons with nuclei. Moreover, by studying the hadron attenuation of the leading and sub-leading hadrons, we report, for the first time, the possibility of better disentangling between the hadron absorption and the energy loss contribution.
Preview · Article · Jul 2004 · Journal of Physics G Nuclear and Particle Physics