### Particle, Astrophysics, and Nuclear Physics Seminar

Monday, October 14, 2019
2:00pm – 3:00pm

Storrs Campus
GS-413.E

Dr. Masakaki Tomii, Department of Physics, University of Connecticut Non-perturbative matching of Wilson coefficients from four-flavor to three-flavor theories using lattice QCD

The first lattice result for direct CP violation in $$K \to \pi\pi$$ 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 $$K \to \pi\pi$$ 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.

Contact:

Prof. L. Jin

Physics Department (primary), College of Liberal Arts and Sciences, UConn Master Calendar