International Conference on Kaon Physics 2019

Session

Epsilon’/Epsilon

11 Sept 2019, 11:10

Aula Magna (University of Perugia (Italy))

Conveners

Epsilon’/Epsilon

• Elizabeth Worcester

61. K->pi-pi decay, epsilon' and the RBC-UKQCD kaon physics program

Norman Christ (Columbia University)

11/09/2019, 11:10

Talk

An overview of the kaon physics program of the RBC and UKQCD collaborations will be presented with a focus on the lattice calculation of K->pi-pi decay and the direct CP violation parameter epsilon'. We will describe substantial improvements to our earlier 2015 K->pi-pi calculation, including the use of three independent pi-pi interpolating operators and the results we obtain for I=0 pi-pi...

62. Higher-order contributions to direct CP violation in 𝐾→𝜋𝜋 decays

Maria Cerdà-Sevilla

11/09/2019, 11:40

Talk

Novel lattice results reveal a tension between the measured direct CP violation in 𝐾→𝜋𝜋 decays and the standard model theory prediction. This inconsistency could have several sources, one of which could be the missing contribution of new particles in the theory predictions. However, a reliable standard model prediction is needed to disentangle possible new physics effects from the standard...

31. Isospin breaking corrections to eps'/eps

Antonio Rodríguez Sánchez (Lund University)

11/09/2019, 12:10

Talk

We present an updated analysis of isospin-violating contributions to eps'/eps in the framework of chiral perturbation theory, taking advantage of the different improvements in the determination of quark masses and nonperturbative parameters. The role of the different pieces entering into the analysis is carefully assessed.

63. The Standard Model prediction of epsilon'/epsilon

Antonio Pich (IFIC, U. Valencia -.)

11/09/2019, 12:40

Talk

We review the current status of epsilon'/epsilon within the Standard Model, discussing in detail the different ingredients that enter into the calculation of this observable. Both short-distance and long-distance contributions need to be taken into account, within a properly-defined theoretical framework. An update of the Standard Model prediction is presented and the prospects for future...