Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 95: Flavour-Physik
T 95.6: Talk
Thursday, March 3, 2016, 18:00–18:15, VMP6 HS F
Branching fraction measurement of the very rare decay K±→ µ±νµe+ e− — •Radoslav Marchevski for the NA62 collaboration — Johannes Gutenberg Universität, Mainz, Germany
The rare decay K±→ µ±νµe+ e− proceeds via a K±→ µ±νµ decay with a radiated photon, which subsequently undergoes an internal conversion. While the biggest part of the decay rate is due to final state radiation from the outgoing muon, events with high invariant e+ e− masses give access to direct photon emission from the weak vertex.
The NA48/2 Collaboration has collected the world largest sample on K± decays. We report the measurement of the branching fraction for mee > 140 MeV/c2 and compare the result to the predictions of Chiral Perturbation Theory. The simultaneous collection of K+ and K− decays in the NA48/2 experiment in addition allows the search for CP violation in this decay.