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.. - (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
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± → 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.
Pubblicazioni consigliate
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris
