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

Article Physics, Nuclear

Charge-symmetry-breaking effects on neutron ? decay in nonrelativistic quark models

Jacob W. Crawford et al.

Summary: This paper discusses a formalism for the study of charge-symmetry-breaking (CSB) effects and uses it to analyze the effects of charge-symmetry breaking on neutron beta decay. The inclusion of CSB reduces the beta-decay matrix element by a value on the order of 10-4, which is higher than the previous estimate. Previous calculations did not consider the matrix element of the sum of the individual terms between the ground and excited states, instead using the neutron-proton mass difference as the CSB operator. The electromagnetic and dynamic effects of the up-down quark mass difference counteract each other in the computation of the n-p mass difference but contribute coherently to the excitation matrix elements, causing significant enhancements. The current uncertainty in the value of Vud is also of the order of 10-4. To improve that uncertainty by an order of magnitude, future analyses need to include charge-symmetry-breaking effects.

PHYSICAL REVIEW C (2022)

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Review Physics, Particles & Fields

FLAG Review 2021

Y. Aoki et al.

Summary: In this review, lattice results related to pion, kaon, D-meson, B-meson, and nucleon physics are discussed, including determination of light-quark masses, form factor in semileptonic K -> pi transition, decay constant ratio, low-energy constants in Chiral Perturbation Theory, B-K parameter, heavy-quark quantities, strong coupling constant, and nucleon matrix elements.

EUROPEAN PHYSICAL JOURNAL C (2022)

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Article Astronomy & Astrophysics

Lattice calculation of the pion mass difference Mπ+ -Mπ0 at order O(αem)

R. Frezzotti et al.

Summary: In this study, we present a lattice calculation of the charged/neutral pion mass difference and obtain a result that is in good agreement with experimental measurements.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields