Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-27
Nucl.Phys.B819:306-318,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1016/j.nuclphysb.2009.05.004
The unified description of fragmentation function evolution from large to small x which was developed for the vacuum in previous publications is now generalized to the medium, and is studied for the case in which the complete contribution from the largest class of soft gluon logarithms, the double logarithms, are accounted for and with the fixed order part calculated to leading order. In this approach it proves possible to choose the remaining degrees of freedom related to the medium such that the distribution of produced hadrons is suppressed at large momenta while the production of soft radiation-induced charged hadrons at small momenta is enhanced, in agreement with experiment. Just as for the vacuum, our approach does not require further assumptions concerning fragmentation and is more complete than previous computations of evolution in the medium.
Albino Simon
Kniehl Bernd A.
Perez-Ramos R.
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