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Search for K + decays into the π + e + e - e + e - final state

Cortina Gil, E.·Kleimenova, A. (ORCID:0000000291294985)·Minucci, E. (ORCID:0000000239726824)·Padolski, S. (ORCID:0000000267957670)·Petrov, P.·Shaikhiev, A. (ORCID:0000000329218743)·Volpe, R. (ORCID:0000000317822978)·Numao, T. (ORCID:0000000152326190)·Petrov, Y. (ORCID:0000000326438740)·Velghe, B. (ORCID:0000000207978381)·Wong, V. W.S. (ORCID:0000000159758164)·Bryman, D. (ORCID:0000000296910775)·Fu, J.·Hives, Z. (ORCID:000000025025993X)·Husek, T. (ORCID:0000000272089150)·Jerhot, J. (ORCID:0000000232361471)·Kampf, K. (ORCID:000000031096667X)·Zamkovsky, M. (ORCID:0000000250674789)·De Martino, B. (ORCID:0000000320289326)·Perrin-Terrin, M. (ORCID:0000000235681956)·Akmete, A. T. (ORCID:0000000255805477)·Aliberti, R. (ORCID:0000000335004012)·Khoriauli, G. (ORCID:0000000263538452)·Kunze, J.·Lomidze, D. (ORCID:0000000339366942)·Peruzzo, L. (ORCID:0000000247526160)·Vormstein, M.·Wanke, R. (ORCID:000000023636360X)·Dalpiaz, P.·Fiorini, M. (ORCID:0000000165592084)·Mazzolari, A. (ORCID:0000000308046778)·Neri, I. (ORCID:0000000296691058)·Norton, A. (ORCID:0000000159595879)·Petrucci, F. (ORCID:0000000272206919)·Soldani, M. (ORCID:000000034902943X)·Wahl, H. (ORCID:0000000303542465)·Bandiera, L. (ORCID:0000000255379674)·Cotta Ramusino, A. (ORCID:0000000317272478)·Gianoli, A. (ORCID:0000000224568667)·Romagnoni, M. (ORCID:0000000227756903)·Sytov, A. (ORCID:0000000187892440)·Iacopini, E. (ORCID:0000000256052497)·Latino, G. (ORCID:0000000240983502)·Lenti, M. (ORCID:0000000227653955)·Lo Chiatto, P. (ORCID:000000024177557X)·Panichi, I. (ORCID:0000000177497914)·Parenti, A. (ORCID:0000000261325680)·Bizzeti, A. (ORCID:0000000157295530)·Bucci, F. (ORCID:0000000317263838)·Antonelli, A. (ORCID:0000000176717890)·Georgiev, G. (ORCID:0000000168843942)·Kozhuharov, V. (ORCID:0000000206697799)·Lanfranchi, G. (ORCID:0000000294678001)·Martellotti, S. (ORCID:0000000243637816)·Moulson, M. (ORCID:0000000239514389)·Spadaro, T. (ORCID:0000000271012389)·Tinti, G. (ORCID:000000031364844X)·Ambrosino, F. (ORCID:0000000155771820)·Capussela, T.·Corvino, M. (ORCID:000000022401412X)·D'Errico, M. (ORCID:0000000153261106)·Di Filippo, D. (ORCID:0000000315676786)·Fiorenza, R. (ORCID:0000000349657073)·Giordano, R. (ORCID:0000000254967247)·Massarotti, P. (ORCID:0000000293359690)·Mirra, M. (ORCID:0000000211902961)·Napolitano, M. (ORCID:0000000310749552)·Rosa, I. (ORCID:0009000275641825)·Saracino, G. (ORCID:0000000207145777)·Anzivino, G. (ORCID:0000000259670952)·Brizioli, F. (ORCID:000000022047441X)·Imbergamo, E.·Lollini, R. (ORCID:0000000338987464)·Piandani, R. (ORCID:0000000322268924)·Santoni, C. (ORCID:0000000170237116)·Barbanera, M. (ORCID:0000000236163341)·Cenci, P. (ORCID:0000000161492676)·Checcucci, B. (ORCID:0000000264641099)·Lubrano, P. (ORCID:0000000302214806)·Lupi, M. (ORCID:0000000197706197)·Pepe, M. (ORCID:0000000156244010)·Piccini, M. (ORCID:0000000186594409)·Costantini, F. (ORCID:0000000229740067)·Di Lella, L. (ORCID:0000000336971098)·Doble, N. (ORCID:0000000201745608)·Giorgi, M. (ORCID:0000000195716260)·Giudici, S. (ORCID:0000000334237981)·Lamanna, G. (ORCID:0000000174528498)·Lari, E. (ORCID:0000000333030524)·Pedreschi, E. (ORCID:0000000176313933)·Sozzi, M. (ORCID:0000000229231465)·Cerri, C.·Fantechi, R. (ORCID:0000000262435726)·Pontisso, L. (ORCID:0000000171375254)·Spinella, F. (ORCID:0000000296077920)·Mannelli, I. (ORCID:0000000304457422)·D'Agostini, G. (ORCID:000000026245875X)·Raggi, M. (ORCID:0000000274489481)·Biagioni, A. (ORCID:0000000158201209)·Cretaro, P. (ORCID:000000022229149X)
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Abstract

The first search for ultra-rare K + decays into the π + e + e - e + e - final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4 x 10 -8 at 90% CL is obtained for the branching ratio of the K + → π + e + e - e + e - decay, predicted in the Standard Model to be (7.2 ± 0.7) x 10 -11 . Upper limits at 90% CL are obtained at the level of 10 -9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K + → π + aa,a → e + e - and K + → π + S,S → A'A',A' → e + e - .

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Cortina Gil, E., Kleimenova, A. (ORCID:0000000291294985), Minucci, E. (ORCID:0000000239726824), Padolski, S. (ORCID:0000000267957670), Petrov, P., Shaikhiev, A. (ORCID:0000000329218743), Volpe, R. (ORCID:0000000317822978), Numao, T. (ORCID:0000000152326190), Petrov, Y. (ORCID:0000000326438740), Velghe, B. (ORCID:0000000207978381), Wong, V. W.S. (ORCID:0000000159758164), Bryman, D. (ORCID:0000000296910775), Fu, J., Hives, Z. (ORCID:000000025025993X), Husek, T. (ORCID:0000000272089150), Jerhot, J. (ORCID:0000000232361471), Kampf, K. (ORCID:000000031096667X), Zamkovsky, M. (ORCID:0000000250674789), De Martino, B. (ORCID:0000000320289326), Perrin-Terrin, M. (ORCID:0000000235681956), Akmete, A. T. (ORCID:0000000255805477), Aliberti, R. (ORCID:0000000335004012), Khoriauli, G. (ORCID:0000000263538452), Kunze, J., Lomidze, D. (ORCID:0000000339366942), Peruzzo, L. (ORCID:0000000247526160), Vormstein, M., Wanke, R. (ORCID:000000023636360X), Dalpiaz, P., Fiorini, M. (ORCID:0000000165592084), Mazzolari, A. (ORCID:0000000308046778), Neri, I. (ORCID:0000000296691058), Norton, A. (ORCID:0000000159595879), Petrucci, F. (ORCID:0000000272206919), Soldani, M. (ORCID:000000034902943X), Wahl, H. (ORCID:0000000303542465), Bandiera, L. (ORCID:0000000255379674), Cotta Ramusino, A. (ORCID:0000000317272478), Gianoli, A. (ORCID:0000000224568667), Romagnoni, M. (ORCID:0000000227756903), Sytov, A. (ORCID:0000000187892440), Iacopini, E. (ORCID:0000000256052497), Latino, G. (ORCID:0000000240983502), Lenti, M. (ORCID:0000000227653955), Lo Chiatto, P. (ORCID:000000024177557X), Panichi, I. (ORCID:0000000177497914), Parenti, A. (ORCID:0000000261325680), Bizzeti, A. (ORCID:0000000157295530), Bucci, F. (ORCID:0000000317263838), Antonelli, A. (ORCID:0000000176717890), Georgiev, G. (ORCID:0000000168843942), Kozhuharov, V. (ORCID:0000000206697799), Lanfranchi, G. (ORCID:0000000294678001), Martellotti, S. (ORCID:0000000243637816), Moulson, M. (ORCID:0000000239514389), Spadaro, T. (ORCID:0000000271012389), Tinti, G. (ORCID:000000031364844X), Ambrosino, F. (ORCID:0000000155771820), Capussela, T., Corvino, M. (ORCID:000000022401412X), D'Errico, M. (ORCID:0000000153261106), Di Filippo, D. (ORCID:0000000315676786), Fiorenza, R. (ORCID:0000000349657073), Giordano, R. (ORCID:0000000254967247), Massarotti, P. (ORCID:0000000293359690), Mirra, M. (ORCID:0000000211902961), Napolitano, M. (ORCID:0000000310749552), Rosa, I. (ORCID:0009000275641825), Saracino, G. (ORCID:0000000207145777), Anzivino, G. (ORCID:0000000259670952), Brizioli, F. (ORCID:000000022047441X), Imbergamo, E., Lollini, R. (ORCID:0000000338987464), Piandani, R. (ORCID:0000000322268924), Santoni, C. (ORCID:0000000170237116), Barbanera, M. (ORCID:0000000236163341), Cenci, P. (ORCID:0000000161492676), Checcucci, B. (ORCID:0000000264641099), Lubrano, P. (ORCID:0000000302214806), Lupi, M. (ORCID:0000000197706197), Pepe, M. (ORCID:0000000156244010), Piccini, M. (ORCID:0000000186594409), Costantini, F. (ORCID:0000000229740067), Di Lella, L. (ORCID:0000000336971098), Doble, N. (ORCID:0000000201745608), Giorgi, M. (ORCID:0000000195716260), Giudici, S. (ORCID:0000000334237981), Lamanna, G. (ORCID:0000000174528498), Lari, E. (ORCID:0000000333030524), Pedreschi, E. (ORCID:0000000176313933), Sozzi, M. (ORCID:0000000229231465), Cerri, C., Fantechi, R. (ORCID:0000000262435726), Pontisso, L. (ORCID:0000000171375254), Spinella, F. (ORCID:0000000296077920), Mannelli, I. (ORCID:0000000304457422), D'Agostini, G. (ORCID:000000026245875X), Raggi, M. (ORCID:0000000274489481), Biagioni, A. (ORCID:0000000158201209), Cretaro, P. (ORCID:000000022229149X). 2023-09-22. Search for K + decays into the π + e + e - e + e - final state. https://doi.org/10.1016/j.physletb.2023.138193

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