Particles, Astrophysics, and Nuclear Physics Seminar
“Non-perturbative matching of Wilson coefficients from four-flavor to three-flavor theories using lattice QCD”
Dr. Masaaki Tomii
Department of Physics
University of Connecticut
Abstract: The first lattice result for direct CP violation in K→ππ decay in the Standard Model published by RBC/UKQCD in 2015 is desired to be more precise to see the deviation from the experimental value more clearly. In this talk, I will overview RBC/UKQCD’s calculation of K→ππ matrix elements mentioning a particular error source: Since RBC/UKQCD calculated the matrix elements with the four-quark operators without the charm quark, we need the corresponding Wilson coefficients in the three-flavor theory, which can be obtained by converting from the four-flavor theory.
Perturbative matching may result in a significant uncertainty since it needs to be done below charm threshold. To resolve this problem, we are trying to do this matching in a non-perturbative prescription using lattice QCD. I will explain the strategy of the matching and show some results of an exploratory calculation.
Monday, October 14, 2019
2:00 PM
Gant South Building, Room GS413E
For more information, contact: Anna Huang at anna.huang@uconn.edu