Precise measurement of Ke4 form factors and branching ratios at the NA48/2 experiment

Abstract

The NA48/2 experiment at CERN [V. Fanti et al., Nucl. Instrum. Meth. A574 433–471 (2007).] collected ∼ 18 ⋅ 10 9 charged kaon decays during the years 2003/4. Along with the primary goals of the collaboration, i.e., the measurement of the CP-violating asymmetry in the K ± → π ± π + π − and K ± → π ± π 0 π 0 channels, the collected data allowed to perform many other interesting analyses. In this paper the measurement of the K ± → e ± ν π + π − and K ± → e ± ν π 0 π 0 decaysʼ branching ratios (BR) and form factors will be reviewed.