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

  title={A complete update of \$\varepsilon'/\varepsilon\$ in the Standard Model},
  author={Vincenzo Cirigliano and Hector Gisbert and Antonio Pich and Antonio Rodr'iguez-S'anchez},
  journal={arXiv: High Energy Physics - Phenomenology},
The recent release of improved lattice data has revived again the interest on precise theoretical calculations of the direct CP-violation ratio $\varepsilon'/\varepsilon$. We present a complete update of the Standard Model prediction [1,2], including a new re-analysis of isospin-breaking corrections which are of vital importance in the theoretical determination of this observable. The Standard Model prediction, $\mathrm{Re} (\epsilon'/\epsilon) = (14\pm 5)\cdot 10^{-4}$, turns out to be in good… 
2 Citations

Figures and Tables from this paper

Nonleptonic $K\to 2\,\pi$ decay dynamics
Using Chiral Perturbation Theory to properly account for the dynamics of nonleptonic $K\to 2\,\pi$ decays, we found the Standard Model prediction for the CP violating ratio
Exploring the flavour structure of the high-scale MSSM
We analyse the sensitivity of quark flavour-changing observables to the MSSM, in a regime of heavy superpartners. We analyse four distinct and motivated frameworks characterising the structure of the


Isospin-violating contributions to ∈′/∈
Abstract The known isospin-breaking contributions to the K → ππ amplitudes are reanalyzed, taking into account our current understanding of the quark masses and the relevant non-perturbative inputs.
On the importance of NNLO QCD and isospin-breaking corrections in $$\varepsilon '/\varepsilon $$
<jats:p>Following the 1999 analysis of Gambino, Haisch and one of us, we stress that all the recent NLO analyses of <jats:inline-formula><jats:alternatives><jats:tex-math>$$\varepsilon '/\varepsilon