Lattice QCD at LANL (2022 PR) [Slides]
Highlights of research using LANL Institutional Computing resources under allocation Y22_nme.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
Engineering topics
Yoo, Jun-Sik
Publications and source records attributed to Yoo, Jun-Sik.
Electroweak box diagrams on the lattice for pion and neutron decay
CKM matrix is unitary by construction in the standard model(SM). The recent analyses on the first row of CKM matrix show ≈3σ tension with unitarity. Nonperturbative calculations of the radiative corrections can reduce the theory uncertainty in CKM matrix elements. Here we compute the electroweak box contribution to the pion and kaon β decays using seven Nf = 2 + 1 + 1 HISQ-Clover lattice with various pion mass and lattice spacing. The continuum and chiral limit is taken using the leading dependence on M π and a, where M π extrapolation is taken to the physical pion mass and SU(3) symmetric mass for pion and kaon box contribution, respectively. Our results are $\square^{VA}_{γW}|_{π}$ = 2.820(28) × 10 –3 and $\square^{VA}_{γW}|_{K}$ = 2.384(17) × 10 –3 .
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗