CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics

Search for LNV by the NA48 Experiment

29 May 2018, 15:00

20m

South Foyer | Ocotillo Room (Hyatt Regency Indian Wells Conference Center)

Parallel PPHI HFCKM / PPHI

Speaker

Dr Cristina Biino (INFN Torino)

Description

In 2003–2004 the NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles. A new upper limit on the rate of the lepton number violating decay $K^{\pm }\to {\pi }^{\mp }{\mu }^{\pm }{\mu }^{\pm }$ is reported: $B(K^{\pm }\to {\pi }^{\mp }{\mu }^{\pm }{\mu }^{\pm })<8.6\times {10}^{-11}$ at 90% CL. Searches for two-body resonances $X$ in $K^{\pm }\to \pi \mu \mu$ decays (such as heavy neutral leptons N4 and inflatons $\chi$) are also presented. In the absence of signals, upper limits are set on the products of branching fractions $B(K^{\pm }\to {\mu }^{\pm }N4)\cdot B(N4\to \pi \mu )$ and $B(K^{\pm }\to {\pi }^{\pm }X)\cdot B(X\to {\mu }^{+}{\mu }^{-})$ for ranges of assumed resonance masses and lifetimes. The limits are in the (${10}^{-11},{10}^{-9}$) range for resonance lifetimes below 100 ps.

Presentation materials

Slides

282-0-CIPANP2018_LNV@NA48_NA62_Biino.pdf