https://doi.org/10.1051/epjconf/201817513016
Including electromagnetism in K → ππ decay calculations
1
Department of Physics, Columbia University, New York, NY 10027, USA
2
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
3
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
4
Center for High Energy Physics, Peking University, Beijing 100871, China
* Speaker, e-mail: nhc@phys.columbia.edu, supported in part by US DOE grant #DE-SC0011941.
Published online: 26 March 2018
Because of the small size of the ratio A2/A0 of the I = 2 to I = 0 K → ππ decay amplitudes (the ΔI = 1/2 rule) the effects of electromagnetism on A2 may be a factor of 20 larger than given by a naive O(±EM) estimate. Thus, if future calculations of A2 and epsilon’/epsilon are to achieve 10% accuracy, these effects need to be included. Here we present the first steps toward including electromagnetism in a calculation of the standard model K → ππ decay amplitudes using lattice QCD.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
