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Constraining beyond the standard model nucleon isovector charges
CSSM, Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia.
CSSM, Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia.
School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
RIKEN Center for Computational Science, Kobe, Hyogo 650-0047, Japan.
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2023 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 108, no 9, article id 094511Article in journal (Refereed) Published
Abstract [en]

At the TeV scale, low-energy precision observations of neutron characteristics provide unique probes of novel physics. Precision studies of neutron decay observables are susceptible to beyond the Standard Model (BSM) tensor and scalar interactions, while the neutron electric dipole moment, dn, also has high sensitivity to new BSM CP-violating interactions. To fully utilize the potential of future experimental neutron physics programs, matrix elements of appropriate low-energy effective operators within neutron states must be precisely calculated. We present results from the QCDSF/UKQCD/CSSM Collaboration for the isovector charges gT, gA and gS of the nucleon, ς and Ξ baryons using lattice QCD methods and the Feynman-Hellmann theorem. We use a flavor symmetry breaking method to systematically approach the physical quark mass using ensembles that span five lattice spacings and multiple volumes. We extend this existing flavor-breaking expansion to also account for lattice spacing and finite volume effects in order to quantify all systematic uncertainties. Our final estimates of the nucleon isovector charges are gT=1.010(21)stat(12)sys,gA=1.253(63)stat(41)sys and gS=1.08(21)stat(03)sys renormalized, where appropriate, at μ=2 GeV in the MS¯ scheme.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2023. Vol. 108, no 9, article id 094511
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-340967DOI: 10.1103/PhysRevD.108.094511ISI: 001119009700015Scopus ID: 2-s2.0-85178092762OAI: oai:DiVA.org:kth-340967DiVA, id: diva2:1820292
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QC 20231218

Available from: 2023-12-18 Created: 2023-12-18 Last updated: 2024-02-29Bibliographically approved

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