Study of the rare decays of B0s and B0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
A study of the decays B s 0 → μ+μ− and B0 → μ+μ− has been performed using 26.3 fb−1 of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in μ+μ− invariant mass is comparable to the B s 0 -B0 mass difference, a single fit determi...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
April 15, 2019
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| In: |
Journal of high energy physics
Year: 2019, Heft: 4 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP04(2019)098 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1007/JHEP04(2019)098 |
| Verfasserangaben: | the ATLAS collaboration |
| Zusammenfassung: | A study of the decays B s 0 → μ+μ− and B0 → μ+μ− has been performed using 26.3 fb−1 of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in μ+μ− invariant mass is comparable to the B s 0 -B0 mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction B(B0s→μ+μ−)=(3.2+1.1−1.0)×10−9B(Bs0→μ+μ−)=(3.2−1.0+1.1)×10−9 \mathrm{\mathcal{B}}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\right)=\left({3.2}_{-1.0}^{+1.1}\right)\times {10}^{-9} and an upper limit B(B0→μ+μ−)<4.3×10−10B(B0→μ+μ−)<4.3×10−10 \mathrm{\mathcal{B}}\left({B}^0\to {\mu}^{+}{\mu}^{-}\right)<4.3\times {10}^{-10} at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding B(B0s→μ+μ−)=(2.8+0.8−0.7)×10−9B(Bs0→μ+μ−)=(2.8−0.7+0.8)×10−9 \mathrm{\mathcal{B}}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\right)=\left({2.8}_{-0.7}^{+0.8}\right)\times {10}^{-9} and B(B0→μ+μ−)<2.1×10−10B(B0→μ+μ−)<2.1×10−10 \mathrm{\mathcal{B}}\left({B}^0\to {\mu}^{+}{\mu}^{-}\right)<2.1\times {10}^{-10} at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the B(B0→μ+μ−)−B(B0s→μ+μ−)B(B0→μ+μ−)−B(Bs0→μ+μ−) \mathrm{\mathcal{B}}\left({B}^0\to {\mu}^{+}{\mu}^{-}\right)-\mathrm{\mathcal{B}}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\right) plane. Open image in new window |
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| Beschreibung: | Im Titel sind "0" und "s" untereinander geschrieben: "0" ist beide Male hochgestellt, "s" tiefgestellt The ATLAS collaboration: M. Aaboud, G.V. Andrei, C. Antel, A.E. Baas, A. Bolz, O. Brandt, M. Dunford, S. Franchino, M.P. Geisler, P. Hanke, J. Jongmanns, A. Kugel, M. Lisovyi, H. Meyer zu Theenhausen, M. Sahinsoy, A. Schöning, H.-C. Schultz-Coulon, T. Spieker, R. Stamen, P. Starovoitov, S. Suchek, S. Weber, M. Wessels, X. Yue [und weitere] Gesehen am 08.10.2019 |
| Beschreibung: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP04(2019)098 |