Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-08-05
Physics
Nuclear Physics
Nuclear Theory
8 pages, 4 figures
Scientific paper
A semi-quantitative estimate of the prehadron production time based on recent preliminary HERMES data on hadron transverse momentum broadening in nuclear DIS is presented. The obtained production time can well explain the data except for their dependence on the photon virtuality, which remains a challenge to current theoretical models. A few mechanisms that may contribute to its explanation are suggested, along with possible experimental tests. The average time scale at HERMES is found to be of the order of 4-5 fm, comparable to heavy nuclei radii, so that by suitable kinematic cuts it will be possible to study both the case in which hadronization starts inside and the case in which it starts outside the nucleus. A comparison with recent CLAS preliminary data, which qualitatively but not quantitatively agree with HERMES, is performed.
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