20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Determination of the light quark masses from eta --> 3 pi

22 Jul 2011, 09:45
15m
Bayard (Alpes Congrès - Alpexpo)

Bayard

Alpes Congrès - Alpexpo

Parallel session talk QCD QCD

Speaker

Emilie Passemar (IFIC-University of Valencia)

Description

Recently, an important effort has been devoted at KLOE, MAMI and COSY to precisely measure the eta --> 3 pi decays. These new measurements require to revisit the theoretical analyses of these decays. In this talk, we will present a new analysis of the eta --> 3 pi decay amplitude relying on dispersive methods. We will show how the study of this decay allows to extract a fundamental parameter of the Standard Model, namely the quark mass ratio (m_d^2-m_u^2)/(m_s^2-\hat{m}^2) with a very good precision. We will then discuss the possibility to extract the individual light quark masses.

Primary authors

Emilie Passemar (IFIC-University of Valencia) Gilberto Colangelo (Albert Einstein Center for Fundamental Physics, ITP-Bern) Heinrich Leutwyler (Albert Einstein Center for Fundamental Physics, ITP-Bern) Stefan Lanz (Albert Einstein Center for Fundamental Physics, ITP-Bern)

Presentation Materials