%0 Journal Article
%T Searches for lepton number violation and resonances in K-+/- -> pi μμdecays
%A NA48/2 Collaboration (Batley, J. R. et al
%A Fiorini, L.
%J Physics Letters B
%D 2017
%V 769
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F NA48/2CollaborationBatley+Fiorini2017
%O WOS:000402342500011
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3169), last updated on Thu, 22 Jun 2017 18:06:44 +0000
%X 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.
%R 10.1016/j.physletb.2017.03.029
%U http://arxiv.org/abs/1612.04723
%U https://doi.org/10.1016/j.physletb.2017.03.029
%P 67-76