Including electromagnetism in K → ππ decay calculations
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: firstname.lastname@example.org, 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
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