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: $B(K^\pm \to \pi^\mp\mu^\pm\mu^\pm) < 8.6\times10^{−11}$ 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.
| [email protected] | |
| Collaboration name | NA48 Collaboration |
| Funding source | INFN |
Primary author
Dr
Cristina Biino
(INFN Torino)
