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Kaon decay and neutral Kaon mixing within and beyond the Standard Model

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If you have a question about this talk, please contact Marco Nardecchia .

CP violation was first discovered in kaon decay fifty years ago. If the parameters of direct and indirect CP violation are very well-measured experimentally, a complete and quantitative theoretical computation is still missing. However, thanks to numerical simulations of lattice QCD , an important contribution has been computed two years ago: the amplitude of a kaon to decay into two pions with Isospin two. I will present this work with emphasis on the challenges and on the theoretical ideas which made this computation possible. Then I will present the progress we have made on the other part of the computation, where the two-pion state has isospin zero. From these computations, a tentative explanation of the “Delta I = 1/2 rule” will be given. Finally in the last part of the seminar I will present our work on neutral kaon mixing (within and beyond the standard model) and give an overview of the situation.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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