The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

# Johan Bijnens

Professor

## K to pi pi decays in SU(2) Chiral Perturbation Theory

Author

• Johan Bijnens
• Alejandro Celis

## Summary, in English

We study the decays $K\to\pi\pi$ in one-loop

two-flavour Chiral Perturbation Theory.

We provide arguments why the calculation of the coefficient of the

pionic chiral logarithm

$\logm = M^2\log M^2$

is unique and then perform the calculation. As a check we perform the

reduction of the known three-flavour result.

Our result can be used to perform the extrapolation to the physical

pion mass of direct lattice QCD calculations of $K\to\pi\pi$

at fixed $m_s$ or $m_K^2$.

The underlying arguments

are expected to be valid for heavier particles and other processes as well.

Department/s

• Theoretical Particle Physics - Undergoing reorganization

Publishing year

2009

Language

English

Pages

466-470

Publication/Series

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

680

Issue

5

Document type

Journal article

Publisher

Elsevier

Topic

• Subatomic Physics

Keywords

• 11.30.Rd Chiral symmetries
• 12.39.Fe Chiral Lagrangians
• 13.20.Eb Decays of K mesons

Status

Published

ISBN/ISSN/Other

• ISSN: 0370-2693