Measurement of the B0s→[mu]+[mu]− branching fraction and effective lifetime and search for B0→[mu]+[mu]− decays
A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb−1. An excess of B0s→μ+μ− decays is observed with a significance of 7.8 standard deviations, representing the first obse...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
11 May 2017
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| In: |
Physical review letters
Year: 2017, Jahrgang: 118, Heft: 19 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.118.191801 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.118.191801 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.118.191801 |
| Verfasserangaben: | R. Aaij et al.* (LHCb collaboration) |
| Zusammenfassung: | A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb−1. An excess of B0s→μ+μ− decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B0s→μ+μ−)=(3.0±0.6+0.3−0.2)×10−9, where the first uncertainty is statistical and the second systematic. The first measurement of the B0s→μ+μ− effective lifetime, τ(B0s→μ+μ−)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ− decays is found, and a 95% confidence level upper limit, B(B0→μ+μ−)<3.4×10−10, is determined. All results are in agreement with the standard model expectations. |
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| Beschreibung: | Im Titel sind "0" und "s" untereinander geschrieben: "0" hochgestellt, "s" tiefgestellt Im Titel sind "+" und "-" hochgestellt Im Titel wird "mu" als griechischer Buchstabe dargestellt R. Aaij, P. d'Argent, S. Bachmann, S. Braun, A. Comerma-Montells, M. De Cian, S. Esen, D. Gerick, E. Gersabeck, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, A. Piucci, M. Stahl, S. Stemmle, U. Uwer, A. Zhelezov [und weitere] Gesehen am 20.10.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.118.191801 |