TY  - JOUR
AU  - NA48/2 Collaboration (Batley, J. R. et al
AU  - Fiorini, L.
PY  - 2017
DA  - 2017//
TI  - Searches for lepton number violation and resonances in K-+/- -> pi μμdecays
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 67
EP  - 76
VL  - 769
PB  - Elsevier Science Bv
AB  - 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-+/- -> pi(+/-)mu(+/-)mu(+/-) is reported: B( K-+/- -> pi(+/-)mu(+/-)mu(+/-)) < 8.6 x 10(-11) at 90% CL. Searches for two-body resonances X in K-+/- -> pi μμdecays (such as heavy neutral leptons N-4 and inflatons chi) are also presented. In the absence of signals, upper limits are set on the products of branching fractions B(K-+/- -> μN-+/-(4))B(N-4 -> pi mu) and B(K-+/- ->pi X-+/-)B(X -> 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.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1612.04723
UR  - https://doi.org/10.1016/j.physletb.2017.03.029
DO  - 10.1016/j.physletb.2017.03.029
LA  - English
N1  - WOS:000402342500011
ID  - NA48/2CollaborationBatley+Fiorini2017
ER  -