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

por Emilie Passemar (IFIC Valencia)

jueves 19 may. 2011 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

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.