The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003â2004. A new upper limit on the rate of the lepton number violating decay K±âÏâμ±μ±is reported: B(K±âÏâμ±μ±)<8.6Ã10â11at 90% CL. Searches for two-body resonances X in K±âÏμμ decays (such as heavy neutral leptons N4and inflatons Ï) are also presented. In the absence of signals, upper limits are set on the products of branching fractions B(K±âμ±N4)B(N4âÏμ) and B(K±âϱX)B(Xâμ+μâ) for ranges of assumed resonance masses and lifetimes. The limits are in the (10â11,10â9) range for resonance lifetimes below 100 ps.
Searches for lepton number violation and resonances in K+- -> pi mu mu decays / Batley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; Ceccucci, A.; Cundy, D.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Maier, A.; Massri, K.; Norton, A.; Patel, M.; Peters, A.; Balev, S.; Frabetti, P. L.; Gersabeck, E.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E.; Winston, R.; Rubin, P.; Walker, A.; Baldini, W.; Cotta Ramusino, A.; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Scarpa, M.; Wahl, H.; Bizzeti, A.; Lenti, M.; Veltri, M.; Calvetti, M.; Celeghini, E.; Iacopini, E.; Ruggiero, G.; Behler, M.; Eppard, K.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales Morales, C.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Fonseca Martin, T.; Shieh, M.; Szleper, M.; Velasco, M.; Wood, M. D.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.; Cerri, C.; Fantechi, R.; Collazuol, G.; Dilella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.; Costantini, F.; Doble, N.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.; Bloch-Devaux, B.; Cheshkov, C.; Chèze, J. B.; De Beer, M.; Derré, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Biino, C.; Cartiglia, N.; Marchetto, F.; Bifani, S.; Clemencic, M.; Goy Lopez, S.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 769:(2017), pp. 67-76. [10.1016/j.physletb.2017.03.029]
Searches for lepton number violation and resonances in K+- -> pi mu mu decays
Bizzeti, A.;
2017
Abstract
The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003â2004. A new upper limit on the rate of the lepton number violating decay K±âÏâμ±μ±is reported: B(K±âÏâμ±μ±)<8.6Ã10â11at 90% CL. Searches for two-body resonances X in K±âÏμμ decays (such as heavy neutral leptons N4and inflatons Ï) are also presented. In the absence of signals, upper limits are set on the products of branching fractions B(K±âμ±N4)B(N4âÏμ) and B(K±âϱX)B(Xâμ+μâ) for ranges of assumed resonance masses and lifetimes. The limits are in the (10â11,10â9) range for resonance lifetimes below 100 ps.
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