Lattice QCD Study of Pion Electroproduction and Weak Production from a Nucleon

Gao, Yu-Sheng; Zhang, Zhao-Long; Feng, Xu; Jin, Lu-Chang; Liu, Chuan; Meißner, Ulf-G.

doi:10.1103/PhysRevLett.134.171904

Title: Lattice QCD Study of Pion Electroproduction and Weak Production from a Nucleon

Journal Article · 29 April 2025 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.134.171904 · OSTI ID:2563784

; Zhang, Zhao-Long;

;

Quantum fluctuations in QCD influence nucleon structure and interactions, with pion production serving as a key probe of chiral dynamics. In this Letter, we present a lattice QCD calculation of multipole amplitudes at threshold, related to both pion electroproduction and weak production from a nucleon, using two gauge ensembles near the physical pion mass. We develop a technique for spin projection and construct multiple operators for analyzing the generalized eigenvalue problem in both the nucleon-pion system in the center-of-mass frame and the nucleon system with nonzero momentum. The numerical lattice results are then compared with those extracted from experimental data and predicted by low-energy theorems incorporating one-loop corrections. Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010339; SC0021147

OSTI ID:: 2563784

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 134; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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