Neutron Electric Dipole Moment and Tensor Charges from Lattice QCD

Tanmoy Bhattacharya, Vincenzo Cirigliano, Rajan Gupta, Huey-Wen Lin, and Boram Yoon (PNDME Collaboration)
Phys. Rev. Lett. 115, 212002 – Published 17 November 2015

Abstract

We present lattice QCD results on the neutron tensor charges including, for the first time, a simultaneous extrapolation in the lattice spacing, volume, and light quark masses to the physical point in the continuum limit. We find that the “disconnected” contribution is smaller than the statistical error in the “connected” contribution. Our estimates in the modified minimal subtraction scheme at 2 GeV, including all systematics, are gTdu=1.020(76), gTd=0.774(66), gTu=0.233(28), and gTs=0.008(9). The flavor diagonal charges determine the size of the neutron electric dipole moment (EDM) induced by quark EDMs that are generated in many new scenarios of CP violation beyond the standard model. We use our results to derive model-independent bounds on the EDMs of light quarks and update the EDM phenomenology in split supersymmetry with gaugino mass unification, finding a stringent upper bound of dn<4×1028ecm for the neutron EDM in this scenario.

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  • Received 8 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.212002

© 2015 American Physical Society

Authors & Affiliations

Tanmoy Bhattacharya1,*, Vincenzo Cirigliano1,†, Rajan Gupta1,‡, Huey-Wen Lin2,§, and Boram Yoon1,∥ (PNDME Collaboration)

  • 1Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
  • 2Physics Department, University of California, Berkeley, California 94720, USA

  • *tanmoy@lanl.gov
  • cirigliano@lanl.gov
  • rajan@lanl.gov
  • §hueywenlin@lbl.gov
  • boram@lanl.gov

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Issue

Vol. 115, Iss. 21 — 20 November 2015

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