Neutron Electric Dipole Moment and Tensor Charges from Lattice QCD

Journal Article · 16 November 2015 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.115.212002 · OSTI ID:2942286

Bhattacharya, Tanmoy ^[1]; Cirigliano, Vincenzo ^[1]; Gupta, Rajan ^[1]; Lin, Huey-Wen ^[2]; Yoon, Boram ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
2. University of California, Berkeley, CA (United States)

Here, 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 𝑔$$^{𝑑−𝑢}_𝑇$$ =1.020⁢(76), 𝑔$$^𝑑_𝑇$$ = 0.774⁢(66), 𝑔$$^𝑢_𝑇$$ = −0.233⁢(28), and 𝑔$$^𝑠_𝑇$$ = 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 𝐶⁢𝑃 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 𝑑_𝑛 < 4 × 1⁢0⁻²⁸ 𝑒 cm for the neutron EDM in this scenario.

• Research Organization: University of California, Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0004658; AC02-05CH11231
• OSTI ID: 2942286
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 115; ISSN 1079-7114; ISSN 0031-9007
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English