Searches for lepton number violation and resonances in K± → πμμ decays

NA48/2 Collaboration (2017) Searches for lepton number violation and resonances in K± → πμμ decays. Physics Letters B, 769. pp. 67-76. ISSN 0370-2693

Abstract

The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003--2004. A new upper limit on the rate of the lepton number violating decay $K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm}$ is reported: $\mathcal{B}(K^{\pm}\to\pi^{\mp}\mu^{\pm}\mu^{\pm})