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Title: Parton transverse momentum and orbital angular momentum distributions

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Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
FG02-96ER40965; AC05-06OR23177; , DE-FG02-01ER41200
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 3; Related Information: CHORUS Timestamp: 2016-08-29 18:09:19; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Rajan, Abha, Courtoy, Aurore, Engelhardt, Michael, and Liuti, Simonetta. Parton transverse momentum and orbital angular momentum distributions. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.034041.
Rajan, Abha, Courtoy, Aurore, Engelhardt, Michael, & Liuti, Simonetta. Parton transverse momentum and orbital angular momentum distributions. United States. doi:10.1103/PhysRevD.94.034041.
Rajan, Abha, Courtoy, Aurore, Engelhardt, Michael, and Liuti, Simonetta. Mon . "Parton transverse momentum and orbital angular momentum distributions". United States. doi:10.1103/PhysRevD.94.034041.
title = {Parton transverse momentum and orbital angular momentum distributions},
author = {Rajan, Abha and Courtoy, Aurore and Engelhardt, Michael and Liuti, Simonetta},
abstractNote = {},
doi = {10.1103/PhysRevD.94.034041},
journal = {Physical Review D},
number = 3,
volume = 94,
place = {United States},
year = {Mon Aug 29 00:00:00 EDT 2016},
month = {Mon Aug 29 00:00:00 EDT 2016}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.94.034041

Citation Metrics:
Cited by: 7works
Citation information provided by
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  • New data from the European Muon Collaboration (EMC) on the spin-spin asymmetry in deep-inelastic lepton-proton scattering suggests that the total spin carried by valence quarks in a polarized proton may be approximately canceled by a strong negative polarization of the sea of q-barq pairs. The evolution in Q/sup 2/ of the fraction of proton spin carried by gluons depends on the initial spin fractions and it is possible to avoid the introduction of large orbital angular momentum by adopting a ''hybrid'' quark-Skyrme picture of the proton suggested by the EMC results.
  • Impact parameter dependent parton distributions are transversely distorted when one considers transversely polarized nucleons and/or quarks. This provides a physical mechanism for the T-odd Sivers effect in semi-inclusive deep-inelastic scattering. The transverse distortion can also be connected with Ji's quark angular momentum relation. The distortion of chirally odd impact parameter dependent parton distributions is related to chirally odd generalized parton distributions (GPDs). This result is used to provide a decomposition of the quark angular momentum with respect to (w.r.t.) quarks of definite transversity. Chirally odd GPDs can thus be used to determine the correlation between quark spin and quark angularmore » momentum in unpolarized nucleons. Based on the transverse distortion, we also suggest a qualitative connection between chirally odd GPDs and the Boer-Mulders effect.« less
  • Transverse parton momentum dependent distribution functions (TMDs) of the nucleon are studied in a covariant model, which describes the intrinsic motion of partons in terms of a covariant momentum distribution. The consistency of the approach is demonstrated, and model relations among TMDs are studied. As a by-product it is shown how the approach allows to formulate the nonrelativistic limit.
  • We use the so-called valon model, to describe the spin structure of the nucleon. We show that about 40% of the nucleon spin is carried by the polarized valence quarks. The remaining part comes from the gluon polarization and the orbital angular momentum. It is shown that the sea quark contributions to the spin of any hadron is simply marginal and consistent with zero. We also found that the value of a{sub 8} is substantially smaller than the value inferred from hyperon--{beta} decay, suggesting that full SU(3) symmetric assumption needs to be reconsidered. New and emerging experimental data tend tomore » support this finding. Finally, we show that within the model presented here the experimental data on the polarized structure functions g{sub 1}{sup p,n,d} are reproduced.« less
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