# Implications of tau data for CP violation in K decays

### Submission summary

 As Contributors: Antonio Rodriguez Sanchez Preprint link: scipost_201811_00027v1 Date accepted: 2019-01-15 Date submitted: 2018-11-16 01:00 Submitted by: Rodriguez Sanchez, Antonio Submitted to: SciPost Physics Proceedings Proceedings issue: The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) Academic field: Physics Specialties: High-Energy Physics - Phenomenology Approach: Theoretical

### Abstract

The $D=6$ contribution of the Operator Product Expansion (OPE) of the VV-AA correlator of quark currents can be related to hadronic matrix elements associated to CP violation in non-leptonic kaon decays. We use those relations to find an updated value for $\langle(\pi\pi)_{I=2}|\mathcal{Q}_{8}|K\rangle$ in the chiral limit using the updated ALEPH spectral function. Taking instead values of the matrix elements from the lattice to obtain the $D=6$ vacuum elements provides a new short-distance constraint that allows for an inclusive determination of $f_{\pi}$ and an updated value for the $D=8$ condensate.

Published as SciPost Phys. Proc. 1, 005 (2019)

### Submission & Refereeing History

#### Published as SciPost Phys. Proc. 1, 005 (2019)

Submission scipost_201811_00027v1 on 16 November 2018

## Reports on this Submission

### Anonymous Report 1 on 2018-12-13 (Invited Report)

• Cite as: Anonymous, Report on arXiv:scipost_201811_00027v1, delivered 2018-12-13, doi: 10.21468/SciPost.Report.741

### Report

The conference contribution under consideration presents in part updated results of the reviewed journal publication Phys. Rev. D94 (2016) 014017. Furthermore, together with A. Pich, it has already been published as a rather similar proceedings article arXiv:1811.06706 [hep-ph] for the QCD 18 conference in Montpellier. It is reasonably well written and clear. Hence, in my opinion there is no need for a more detailed report.

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