Nucleon Matrix Elements of the Antisymmetric Quark Tensor

Nov 27, 2018
7 pages
Published in:
  • Phys.Rev.Lett. 122 (2019) 12, 122001,
  • Phys.Rev.Lett. 124 (2020) 19, 199901 (erratum)
  • Published: Mar 30, 2019
e-Print:
Report number:
  • INT-PUB-18-057

Citations per year

2018202020222024202502468
Abstract: (APS)
If physics beyond the standard model enters well above the electroweak scale, its low-energy effects are described by standard model effective field theory. Already, at dimension 6, many operators involve the antisymmetric quark tensor q¯σμνq, whose matrix elements are difficult to constrain from experiment, Ward identities, or low-energy theorems, in contrast to the corresponding vector and axial-vector or even scalar and pseudoscalar currents. However, with normalizations determined from lattice QCD, analyticity and unitarity often allow one to predict the momentum dependence in a large kinematic range. Starting from recent results in the meson sector, we extend this method to the nucleon case and, in combination with pole dominance, provide a comprehensive assessment of the current status of the nucleon form factors of the quark tensor.
Note:
  • 7 pages, 3 figures; strangeness input updated
  • Elementary Particles and Fields
  • nucleon: form factor: tensor
  • standard model
  • effective field theory
  • quark: current
  • current: tensor
  • quark: operator
  • operator: dimension: 6
  • quantum chromodynamics: lattice