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± → π μμ 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 → πμ) 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± → π μμ 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.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 128556:(2016), pp. N/A-N/A. (38th International Conference on High Energy Physics, ICHEP 2016 usa 2016).
Searches for Lepton number violation and resonances in the K± → π μμ decays at the NA48/2 experiment
Bizzeti A.;
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± → π μμ 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 → πμ) 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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