Searches for Lepton number violation and resonances in the K± → π μμ decays at the NA48/2 experiment

Karim Massri, G. Anzivino, R. Arcidiacono, W. Baldini, S. Balev, J. R. Batley, M. Behler, S. Bifani, C. Biino, A. Bizzeti, B. Bloch-Devaux, G. Bocquet, N. Cabibbo, M. Calvetti, N. Cartiglia, A. Ceccucci, P. Cenci, C. Cerri, C. Cheshkov, J. B. ChèzeM. Clemencic, G. Collazuol, F. Costantini, A. Cotta Ramusino, D. Coward, D. Cundy, A. Dabrowski, P. Dalpiaz, C. Damiani, M. De Beer, J. Derré, H. Dibon, L. Dilella, N. Doble, K. Eppard, V. Falaleev, R. Fantechi, M. Fidecaro, L. Fiorini, M. Fiorini, T. Fonseca Martin, P. L. Frabetti, L. Gatignon, E. Gersabeck, A. Gianoli, S. Giudici, A. Gonidec, E. Goudzovski, S. Goy Lopez, M. Holder, P. Hristov, E. Iacopini, E. Imberg-Amo, M. Jeitler, G. Kalmus, V. Kekelidze, K. Kleinknecht, V. Kozhuharov, W. Kubischta, G. Lamanna, C. Lazzeroni, M. Lenti, L. Litov, D. Madigozhin, A. Maier, I. Mannelli, F. Marchetto, G. Marel, M. Markytan, P. Marouelli, M. Martini, L. Masetti, E. Mazzucato, A. Michetti, I. Mikulec, N. Molokanova, E. Monnier, U. Moosbrugger, C. Morales Morales, D. J. Munday, A. Nappi, G. Neuhofer, A. Norton, M. Patel, M. Pepe, A. Peters, F. Petrucci, M. C. Petrucci, B. Peyaud, M. Piccini, G. Pierazzini, I. Polenkevich, Yu Potrebenikov, M. Raggi, B. Renk, P. Rubin, G. Ruggiero, M. Savrié, M. Scarpa, M. Shieh, M. W. Slater, M. Sozzi, S. Stoynev, E. Swallow, M. Szleper, M. Valdata-Nappi, B. Val-Lage, M. Velasco, M. Veltri, S. Venditti, M. Wache, H. Wahl, A. Walker, R. Wanke, L. Widhalm, A. Winhart, R. Winston, M. D. Wood, S. A. Wotton, A. Zinchenko, M. Ziolkowski

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish (US)
JournalProceedings of Science
VolumePart F128556
StatePublished - 2016
Event38th International Conference on High Energy Physics, ICHEP 2016 - Chicago, United States
Duration: Aug 3 2016Aug 10 2016

ASJC Scopus subject areas

  • General


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