Unraveling hadron transverse momentum in SIDIS: Dynamics, present data, future measurements

Conference · Tue Sep 01 00:00:00 EDT 2015

DOI:https://doi.org/10.2172/1987828· OSTI ID:1987828

Weiss, Christian ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1987828
• Report Number(s): JLAB-THY-16-2280; DOE/OR/23177-3829
• Resource Relation: Conference: TMDe2015, Trieste, Italy, September 2, 2015
• Country of Publication: United States
• Language: English