June 29, 2015 to July 3, 2015
Europe/Rome timezone

Isospin breaking effects in the K^+_{e4} decays

Jun 29, 2015, 3:40 PM
Aula Magna (Building E, Polo Fibonacci, Pisa)

Aula Magna

Building E, Polo Fibonacci, Pisa

Talk Goldstone Boson Working Group Parallel Session 1 - Goldstone Boson WG


Marc Knecht (CNRS/CPT, Marseille)


The very precise data obtained by the NA48/2 collaboration at the CERN SPS on the decay channels K^\pm \to \pi^+ \pi^- e^\pm \stackrel{_{(-)}}{\nu_e}$ and $K^\pm \to \pi^0 \pi^0 e^\pm \stackrel{_{(-)}}{\nu_e}$ have made it necessary to address issues related to isospin breaking. Three aspects related to this issue will be considered: isospin breaking due to the pion mass difference in the phases of the form factors for the $K^\pm \to \pi^+ \pi^- e^\pm \stackrel{_{(-)}}{\nu_e}$ decay amplitude, the cusp in the decay distribution of the $K^\pm \to \pi^0 \pi^0 e^\pm \stackrel{_{(-)}}{\nu_e}$ mode, and radiative corrections.

Primary author

Marc Knecht (CNRS/CPT, Marseille)

Presentation materials