Quark mass difference effects in hadronic Fermi matrix elements from first principles

Seng, Chien-Yeah; Cirigliano, Vincenzo; Feng, Xu; Gorchtein, Mikhail; Jin, Luchang; Miller, Gerald A.

doi:10.1016/j.physletb.2023.138259

Title: Quark mass difference effects in hadronic Fermi matrix elements from first principles

Journal Article · 15 October 2023 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2023.138259 · OSTI ID:2202871

^[1]; Cirigliano, Vincenzo ^[2]; Feng, Xu ^[3]; Gorchtein, Mikhail ^[4]; Jin, Luchang ^[5]; Miller, Gerald A. ^[2]

Michigan State University, East Lansing, MI (United States); University of Washington, Seattle, WA (United States)
University of Washington, Seattle, WA (United States)
Peking University, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Johannes Gutenberg-Universität, Mainz (Germany)
University of Connecticut, Storrs, CT (United States)

It was recently estimated that the strong isospin-symmetry breaking (ISB) corrections to the Fermi matrix element in free neutron decay could be of the order 10^–4, one order of magnitude larger than the naïve estimate based on the Behrends-Sirlin-Ademollo-Gatto theorem. To investigate this claim, we derive a general expression of the leading ISB correction to hadronic Fermi matrix elements, which takes the form of a four-point correlation function in lattice gauge theory and is straightforward to compute from first principles. Our formalism paves the way for the first determination of such correction in the neutron sector with fully-controlled theory uncertainties.

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Research Organization:: Michigan State University, East Lansing, MI (United States); University of Connecticut; University of Washington, Seattle, WA (United States)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft; Deutsche Forschungsgemeinschaft (DFG); EU Horizon 2020 research and innovation programme; Horizon 2020; Horizon Europe; NSFC of China; National Key Research and Development Program of China; National Natural Science Foundation of China; Nuclear Physics; Office of Science; U.S. Department of Energy; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-00ER41132; FG02-97ER41014; SC0010339; SC0013617; SC0021147; SC0023663

OSTI ID:: 2202871

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 846; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (13)

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