Your browser doesn't support javascript.
loading
Lattice QCD Calculation of Electroweak Box Contributions to Superallowed Nuclear and Neutron Beta Decays.
Ma, Peng-Xiang; Feng, Xu; Gorchtein, Mikhail; Jin, Lu-Chang; Liu, Keh-Fei; Seng, Chien-Yeah; Wang, Bi-Geng; Zhang, Zhao-Long.
Afiliación
  • Ma PX; School of Physics, Peking University, Beijing 100871, China.
  • Feng X; School of Physics, Peking University, Beijing 100871, China.
  • Gorchtein M; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
  • Jin LC; Center for High Energy Physics, Peking University, Beijing 100871, China.
  • Liu KF; Institut für Kernphysik, Johannes Gutenberg-Universität, J.J. Becher-Weg 45, 55128 Mainz, Germany.
  • Seng CY; PRISMA+ Cluster of Excellence, Johannes Gutenberg-Universität, Mainz, Germany.
  • Wang BG; Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.
  • Zhang ZL; RIKEN-BNL Research Center, Brookhaven National Laboratory, Building 510, Upton, New York 11973.
Phys Rev Lett ; 132(19): 191901, 2024 May 10.
Article en En | MEDLINE | ID: mdl-38804936
ABSTRACT
We present the first lattice QCD calculation of the universal axial γW-box contribution □_{γW}^{VA} to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of |V_{ud}| from superallowed decays. Our calculation is conducted using two domain wall fermion ensembles at the physical pion mass. To construct the nucleon four-point correlation functions, we employ the random sparsening field technique. Furthermore, we incorporate long-distance contributions to the hadronic function using the infinite-volume reconstruction method. Upon performing the continuum extrapolation, we arrive at □_{γW}^{VA}=3.65(7)_{lat}(1)_{PT}×10^{-3}. Consequently, this yields a slightly higher value of |V_{ud}|=0.973 86(11)_{exp}(9)_{RC}(27)_{NS}, reducing the previous 2.1σ tension with the CKM unitarity to 1.8σ. Additionally, we calculate the vector γW-box contribution to the axial charge g_{A}, denoted as □_{γW}^{VV}, and explore its potential implications.

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2024 Tipo del documento: Article País de afiliación: China

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2024 Tipo del documento: Article País de afiliación: China