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Title: Transverse-momentum-dependent quark distribution functions of spin-one targets: Formalism and covariant calculations

Journal Article · · Physical Review C
 [1];  [2];  [3]
  1. Tokai Univ., Hiratsuka (Japan). Dept. of Physics. School of Science
  2. Tokai Univ., Hiratsuka (Japan). Dept. of Physics. School of Science; RIKEN, Wako (Japan). Radiation Lab. Nishina Center
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division

In this paper, we present a covariant formulation and model calculations of the leading-twist time-reversal even transverse-momentum-dependent quark distribution functions (TMDs) for a spin-one target. Emphasis is placed on a description of these three-dimensional distribution functions which is independent of any constraints on the spin quantization axis. We apply our covariant spin description to all nine leading-twist time-reversal even ρ meson TMDs in the framework provided by the Nambu–Jona-Lasinio model, incorporating important aspects of quark confinement via the infrared cutoff in the proper-time regularization scheme. In particular, the behaviors of the three-dimensional TMDs in a tensor polarized spin-one hadron are illustrated. Sum rules and positivity constraints are discussed in detail. Our results do not exhibit the familiar Gaussian behavior in the transverse momentum, and other results of interest include the finding that the tensor polarized TMDs—associated with spin-one hadrons—are very sensitive to quark orbital angular momentum, and that the TMDs associated with the quark operator γ+γTγ5 would vanish were it not for dynamical chiral symmetry breaking. In addition, we find that 44% of the ρ meson's spin is carried by the orbital angular momentum of the quarks, and that the magnitude of the tensor polarized quark distribution function is about 30% of the unpolarized quark distribution. Finally, a qualitative comparison between our results for the tensor structure of a quark-antiquark bound state is made to existing experimental and theoretical results for the two-nucleon (deuteron) bound state.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Tokai Univ., Hiratsuka (Japan)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); ANL Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1430705
Alternate ID(s):
OSTI ID: 1402531
Journal Information:
Physical Review C, Vol. 96, Issue 4; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Gravitational form factors of light mesons text January 2019

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