# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## A complete update of $\varepsilon'/\varepsilon$ in the Standard Model

11 Jul 2019, 17:10
20m
Campus Ledeganck - Aud. 6 (Ghent)

### Campus Ledeganck - Aud. 6

#### Ghent

Parallel talk Flavour Physics and CP Violation

### Speaker

Hector Gisbert Mullor (University of Valencia - IFIC)

### Description

The recent release of improved lattice data has revived again the interest on precise theoretical predictions for the direct CP-violation ratio $\varepsilon'/\varepsilon$. We present a complete update of the Standard Model prediction, including a new re-analysis of isospin-breaking corrections which are of vital importance in the theoretical determination of this observable. Contrary to recent claims, the Standard Model prediction turns out to be in good agreement with the experimental measurement. In addition, we analyse the prospects for future improvements on the current uncertainty, which is dominated by our current ignorance about $1/N_C$-suppressed contributions to some chiral-perturbation theory low-energy constants.

### Primary authors

Antonio Pich (IFIC, U. Valencia -.) Vincenzo Cirigliano (Los Alamos National Laboratory) Antonio Rodríguez (IFIC (UV-CSIC)) Hector Gisbert Mullor (University of Valencia - IFIC)