Abstract
We present the first lattice QCD calculation of the universal axial γW-box contribution □γWVA to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of |Vud| 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 □γWVA=3.65(7)lat(1)PT×10-3. Consequently, this yields a slightly higher value of |Vud|=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 gA, denoted as □γWVV, and explore its potential implications.
| Original language | English |
|---|---|
| Article number | 191901 |
| Journal | Physical Review Letters |
| Volume | 132 |
| Issue number | 19 |
| DOIs | |
| State | Published - May 10 2024 |
Bibliographical note
Publisher Copyright:© 2024 authors. Published by the American Physical Society.
Funding
X.\u2009F. and L.\u2009C.\u2009J. gratefully acknowledge many helpful discussions with our colleagues from the RBC-UKQCD Collaborations. X.\u2009F., P.\u2009X.\u2009M., and Z.\u2009L.\u2009Z. were supported in part by NSFC of China under Grants No. 12125501, No. 12070131001, and No. 12141501, and National Key Research and Development Program of China under No. 2020YFA0406400. P.\u2009X.\u2009M. and Z.\u2009L.\u2009Z. were supported in part by NSFC of China under Grants No. 12293060 and No. 12293063. L.\u2009C.\u2009J. acknowledges support by DOE Office of Science Early Career Award No. DE-SC0021147 and DOE Award No. DE-SC0010339. The work of M.\u2009G. is supported in part by EU Horizon 2020 research and innovation programme, STRONG-2020 project under Grant Agreement No. 824093, and by the Deutsche Forschungsgemeinschaft (DFG) under the grant agreement GO 2604/3-1. K.\u2009F.\u2009L. and B.\u2009G.\u2009W. are partially supported by the DOE Grant No. DE-SC0013065 and No. DE-AC05-06OR23177. The work of C.-Y.\u2009S. is supported in part by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under the FRIB Theory Alliance award DE-SC0013617, by the DOE Grant No. DE-FG02-97ER41014, and by the DOE Topical Collaboration \u201CNuclear Theory for New Physics,\u201D Award No. DE-SC0023663. The work of B.\u2009G.\u2009W. is supported in part by the DOE Office of Science, Office of Nuclear Physics under the umbrella of the Quark-Gluon Tomography (QGT) Topical Collaboration with Award No. DE-SC0023646. The research reported in this work was carried out using the computing facilities at the Chinese National Supercomputer Center in Tianjin. It also made use of computing and long-term storage facilities of the USQCD Collaboration, which are funded by the Office of Science of the U.S. Department of Energy.
| Funders | Funder number |
|---|---|
| Office of Science Programs | DE-SC0021147 |
| Office of Science Programs | |
| Institute for Nuclear Physics | DE-FG02-97ER41014, DE-SC0023646, DE-SC0013617, DE-SC0023663 |
| Institute for Nuclear Physics | |
| National Natural Science Foundation of China (NSFC) | 12070131001, 12141501, 12125501 |
| National Natural Science Foundation of China (NSFC) | |
| U.S. Department of Energy EPSCoR | DE-SC0010339 |
| U.S. Department of Energy EPSCoR | |
| National Key Basic Research and Development Program of China | 12293060, 2020YFA0406400, 12293063 |
| National Key Basic Research and Development Program of China | |
| Horizon 2020 | 824093 |
| Horizon 2020 | |
| Deutsche Forschungsgemeinschaft | GO 2604/3-1, DE-SC0013065, DE-AC05-06OR23177 |
| Deutsche Forschungsgemeinschaft |
ASJC Scopus subject areas
- General Physics and Astronomy