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Abstract
Hadronization is the non-perturbative process of QCD by which partons become hadrons. It has been studied at high energies through various processes, we focus here on the experiments of lepto-production of hadrons in cold nuclear matter. By studying the dependence of observables to the atomic number of the target, these experiments can give information on the dynamic of the hadronization at the femtometer scale. In particular, we will present preliminary results from JLab Hall B (CLAS collaboration), which give unprecedented statistical precision. Then, we will present results of a phenomenological study showing how HERMES data can be described with pure energy loss models.
Highlights
The hadronization of quarks has been studied through many reactions and has been found to be an universal process involving QCD at the perturbative and non perturbative levels
The study of e+e− and ep collisions gives access to universal functions of fragmentation, Dhi (z), representing the probability for a quark of flavor i to produce a hadron h with a fraction z of its momentum. We go besides this description and focus on the dynamic of the hadronization process, which can provide a new insights on hadronization beyond fragmentation functions
EPJ Web of Conferences with p2T A the mean transverse momentum of hadrons produced in the target A. We present these observables as functions of the usual kinematic factors for semi-inclusive Deep Inelastic Scattering (DIS): Q2 = −q2, the 4momentum squared of the virtual photon; ν = p · q/ p2, the energy of the virtual photon in the target rest frame; z = ph · p/q · p, the fractional energy carried by the hadron and p2T the transverse momentum squared of the hadron, the virtual photon defining the longitudinal direction
Summary
The hadronization of quarks has been studied through many reactions and has been found to be an universal process involving QCD at the perturbative and non perturbative levels. The study of e+e− and ep collisions gives access to universal functions of fragmentation, Dhi (z), representing the probability for a quark of flavor i to produce a hadron h with a fraction z of its momentum. We can decompose the process of hadronization in two parts (see figure 1), first, a part where the quark propagates and can be described with perturbative QCD; a part where it becomes a colorless prehadron expanding into a fully formed hadron. The latter phase is non perturbative and its end defines the formation time, while the former phase ends at the production time.
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