DIS2022: XXIX International Workshop on Deep-Inelastic Scattering and Related Subjects

Latest results on rare decays at the NA62 experiment at CERN

3 May 2022, 15:20

20m

Parallel talk WG3: Electroweak Physics and Beyond the Standard Model WG3: Electroweak Physics and Beyond the Standard Model

Speaker

Artur Shaikhiev (University of Birmingham)

Description

The NA62 experiment at CERN took data in 2016-2018 with the main goal of measuring the K+ -> pi+ nu nubar decay.
A large sample of charged kaon decays into final states with multiple charged particles has been collected in 2016-2018 by the NA62 experiment at CERN. This sample provides sensitivities to lepton flavour/number violating decays of the charged kaon and of the neutral pion with branching ratios as low as 10-11. Searches for lepton flavour/number violating decays of the charged kaon and the neutral pion to final states containing a lepton pair are presented, improving over the best limits measured so far. The first limit on the K+ → π−π0e+e+ decay rate will also be presented.
Searches for K+→e+N, K+→μ +N and K+→μ+νX decays, where N and X are massive invisible particles, are also performed by NA62 using the whole data set.
An improved upper limit of 1.0 x 10−6 is established at 90% CL on the K+→μ+ννv branching fraction.

Presentation materials

shaikhiev_DIS22.pdf