The NA48/2 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2003–2004. A new upper limit on the rate of the lepton number violating decay K± → π∓μ±μ± obtained from this sample is reported: B(K± → π∓μ±μ±) < 8.6 × 10−11 at 90% CL. Searches for two-body resonances in the K± → πμμ decays (including heavy neutral leptons N4 and inflatons χ) in the accessible range of masses and lifetimes are also presented. In the absence of a signal, upper limits are set on the products of branching ratios B(K± → μ±N4)B(N4 → π∓μ±) and B(K± → π±χ)B(χ → μ+μ−) as functions of the resonance mass and lifetime. These limits are in the 10−10 − 10−9 range for resonance lifetimes below 100 ps.
Searches for lepton number violation and resonances in the K± → ΠΜΜ decays at the NA48/2 experiment / Massri K., Anzivino G., Arcidiacono R., Baldini W., Balev S., Batley J.R., Behler M., Bifani S., Biino C., Bizzeti A., Bloch-Devaux B., Bocquet G., Cabibbo N., Calvetti M., Cartiglia N., Ceccucci A., Cenci P., Cerri C., Cheshkov C., Cheze J.B., et al.. - ELETTRONICO. - (2016), pp. 109-116. (51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016 Aosta Valley, ita 2016).
Searches for lepton number violation and resonances in the K± → ΠΜΜ decays at the NA48/2 experiment
Calvetti M.
;Cerri C.;Collazuol G.;Fantechi R.;Iacopini E.
;Lenti M.
;Mannelli I.;Peters A.;Ruggiero G.
;
2016
Abstract
The NA48/2 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2003–2004. A new upper limit on the rate of the lepton number violating decay K± → π∓μ±μ± obtained from this sample is reported: B(K± → π∓μ±μ±) < 8.6 × 10−11 at 90% CL. Searches for two-body resonances in the K± → πμμ decays (including heavy neutral leptons N4 and inflatons χ) in the accessible range of masses and lifetimes are also presented. In the absence of a signal, upper limits are set on the products of branching ratios B(K± → μ±N4)B(N4 → π∓μ±) and B(K± → π±χ)B(χ → μ+μ−) as functions of the resonance mass and lifetime. These limits are in the 10−10 − 10−9 range for resonance lifetimes below 100 ps.
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