Lattice QCD investigation of nucleon transverse momentum-dependent parton distributions
Certain hadronic processes, such as semi-inclusive deep inelastic scattering (SIDIS) and the Drell-Yan process, can be parametrized in terms of transverse momentum-dependent parton distributions (TMDs). These can be defined via matrix elements of a quark bilocal operator containing a staple-shaped Wilson connection, opening the possibility of a lattice QCD calculation of TMDs. A corresponding calculational scheme is developed and explored. On the basis of a parametrization of the relevant matrix elements in terms of invariant amplitudes, the problem can be boosted to a Lorentz frame suitable for the lattice calculation in a simple manner. Results for the Sivers and Boer-Mulders transverse momentum shifts are presented, with a focus on the dependence on both the staple extent and the staple direction.
- 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:
- 1963003
- Report Number(s):
- JLAB-THY-12-1683; DOE/OR/23177-2589
- Journal Information:
- Proceedings of Xth Quark Confinement and the Hadron Spectrum — PoS(Confinement X), Journal Name: Proceedings of Xth Quark Confinement and the Hadron Spectrum — PoS(Confinement X)
- Country of Publication:
- United States
- Language:
- English
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