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Evidence for the rare decay [sigma]+→p[mu]+[mu]-

A search for the rare decay Σ+→pμ+μ− is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies √s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. An excess of events is observed with respect to the background expectation, with a signal signific...

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Detalles Bibliográficos
Autores principales: Aaij, Roel (Autor) , D'Argent, Philippe (Autor) , Bachmann, Sebastian (Autor) , Berninghoff, Daniel (Autor) , Braun, Svende (Autor) , De Cian, Michel (Autor) , Comerma-Montells, Albert (Autor) , Dordei, Francesca (Autor) , Dziewiecki, Michal (Autor) , Esen, Sevda (Autor) , Gerick, David (Autor) , Grabowski, Jascha (Autor) , Han, Xiaoxue (Autor) , Hansmann-Menzemer, Stephanie (Autor) , Kecke, Matthieu (Autor) , Khanji, Basem (Autor) , Kolpin, Michael (Autor) , Kopecná, Renata (Autor) , Leverington, Blake (Autor) , Marks, Jörg (Autor) , Mitzel, Dominik (Autor) , Neubert, Sebastian (Autor) , Neuner, Max (Autor) , Piucci, Alessio (Autor) , Stahl, Marian (Autor) , Stemmle, Simon (Autor) , Uwer, Ulrich (Autor) , Zhelezov, Alexey (Autor)
Autor Corporativo: LHCb Collaboration (Autor)
Formato: Article (Journal)
Lenguaje:inglés
Publicado: 31 May 2018
In: Physical review letters
Year: 2018, Volumen: 120, Número: 22
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.221803
Acceso en línea:Verlag, Volltext: https://doi.org/10.1103/PhysRevLett.120.221803
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.120.221803
Enlace del recurso
Notas de Autor:R. Aaij et al.*(LHCb Collaboration)
Descripción
Sumario:A search for the rare decay Σ+→pμ+μ− is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies √s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ+→pμ+μ− branching fraction is (2.2+1.8−1.3)×10−8, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
Notas:Im Titel sind sigma und mu als griechische Buchstaben dargestellt
R. Aaij, P. d'Argent, S. Bachmann, D. Berninghoff, S. Braun, A. Comerma-Montells, M. De Cian, F. Dordei, M. Dziewiecki, S. Esen, C. Färber, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, R. Kopecna, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, A. Piucci, M. Schiller, P. Seyfert, M. Stahl, S. Stemmle, U. Uwer, A. Zhelezov [und weitere] (LHCb Collaboration)
Gesehen am 07.05.2019
Descripción Física:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.221803

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