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: Aaboud, Morad (VerfasserIn) , Andrei, George Victor (VerfasserIn) , Antel, Claire (VerfasserIn) , Baas, Alessandra Edda (VerfasserIn) , Bolz, Arthur (VerfasserIn) , Brandt, Oleg (VerfasserIn) , Dunford, Monica (VerfasserIn) , Franchino, Silvia (VerfasserIn) , Geisler, Manuel Patrice (VerfasserIn) , Hanke, Paul (VerfasserIn) , Jongmanns, Jan (VerfasserIn) , Kugel, Andreas (VerfasserIn) , Lisovyi, Mykhailo (VerfasserIn) , Meyer zu Theenhausen, Hanno (VerfasserIn) , Narrias Villar, Daniel Isaac (VerfasserIn) , S̜ahinsoy, Merve (VerfasserIn) , Schöning, André (VerfasserIn) , Schultz-Coulon, Hans-Christian (VerfasserIn) , Spieker, Thomas (VerfasserIn) , Stamen, Rainer (VerfasserIn) , Starovoitov, Pavel (VerfasserIn) , Suchek, Stanislav (VerfasserIn) , Weber, Sebastian (VerfasserIn) , Wessels, Martin (VerfasserIn) , Yue, Xiaoguang (VerfasserIn)
Körperschaft: ATLAS Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: April 15, 2019
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
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Verfasserangaben:the ATLAS collaboration
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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
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]
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Beschreibung:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP04(2019)098