PT Journal
AU NA62 collaboration (Cortina Gil, Eea
   Husek, T
TI Searches for lepton number violating K+ decays
SO Physics Letters B
JI Phys. Lett. B
PY 2019
BP 134794
EP 9pp
VL 797
DI 10.1016/j.physletb.2019.07.041
LA English
AB The NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.
ER