Speaker
Christian Weiss
(Jefferson Lab)
Description
The transverse momentum of hadrons observed in the current fragmentation region of SIDIS is generally compounded of several parts: the intrinsic transverse momentum of partons in the target, the effects of QCD radiation, and the broadening due to the fragmentation process. Unraveling the different contributions is a major challenge that needs to be addressed before one can reliably apply QCD factorization formulas and extract information about TMD distributions. Recent pion/kaon multiplicity data from HERMES and COMPASS indicate that non-perturbative dynamics plays an essential role in the measured P_T distributions, particularly at z >~ 0.5. In this talk I briefly summarize
(a) what our present knowledge of non-perturbative dynamics suggests regarding the magnitude of the different contributions to hadron transverse momentum;
(b) what SIDIS measurements could/should be done to unravel the different contributions;
(c) what could be learned from measurements of particle correlations between the current and target fragmentation regions.
The talk will be a concise summary and aim to provide input to the discussions.
It relates mainly to the topics of Sessions 1 and 2 of the program.
| Session | 3: TMDs from unpolarised SIDIS data, pT distributions, azimuthal asymmetries |
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Author
Christian Weiss
(Jefferson Lab)
