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01641 am a22002173u 4500 |
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71647 |
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|a Musch, B. U.
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|a Negele, John W.
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|a Negele, John W.
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|a Hagler, Ph.
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|a Engelhardt, M.
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|a Negele, John W.
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|a Schafer, A.
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|a Sivers and Boer-Mulders observables from lattice QCD
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|b American Physical Society,
|c 2012-07-17T14:03:14Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/71647
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|a We present a first calculation of transverse momentum-dependent nucleon observables in dynamical lattice QCD employing nonlocal operators with staple-shaped, "process-dependent" Wilson lines. The use of staple-shaped Wilson lines allows us to link lattice simulations to TMD effects determined from experiment, and, in particular, to access nonuniversal, naively time-reversal odd TMD observables. We present and discuss results for the generalized Sivers and Boer-Mulders transverse momentum shifts for the SIDIS and DY cases. The effect of staple-shaped Wilson lines on T-even observables is studied for the generalized tensor charge and a generalized transverse shift related to the worm-gear function g[subscript 1T]. We emphasize the dependence of these observables on the staple extent and the Collins-Soper evolution parameter. Our numerical calculations use an n[subscript f]=2+1 mixed action scheme with domain wall valence fermions on an Asqtad sea and pion masses 369 MeV as well as 518 MeV.
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|a en_US
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|a Article
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|t Physical Review D
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