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Title: Proton tensor charges from a Poincaré-covariant Faddeev equation

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4]
  1. Sichuan Univ., Chengdu (People's Republic of China)
  2. Chongqing Univ., Chongqing (People's Republic of China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Forschungszentrum Julich and JARA, Julich (Germany)

The proton’s tensor charges are calculated at leading order in a symmetry-preserving truncation of all matter-sector equations relevant to the associated bound-state and scattering problems. In particular, the nucleon three-body bound-state equation is solved without using a diquark approximation of the two-body scattering kernel. The computed charges are similar to those obtained in contemporary simulations of lattice-regularized quantum chromodynamics, an outcome which increases the tension between theory and phenomenology. Curiously, the theoretical calculations produce a value of the scale-invariant ratio (–δTd/δTu) which matches that obtained in simple quark models, even though the individual charges are themselves different. As a result, the proton's tensor charges can be used to constrain extensions of the Standard Model using empirical limits on nucleon electric dipole moments.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1477737
Alternate ID(s):
OSTI ID: 1471439
Journal Information:
Physical Review D, Journal Name: Physical Review D Journal Issue: 5 Vol. 98; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Practical scheme from QCD to phenomena via Dyson-Schwinger equations text January 2019
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