Measurement of CP violation in the B0s → [phi phi] decay and search for the B0→ [phi phi] decay
A measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ$$ {B}_s^0\to \phi \phi $$ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies s$$ \sqrt{s} $$ = 7 TeV...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
December 23, 2019
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| In: |
Journal of high energy physics
Year: 2019, Jahrgang: 2019, Heft: 12 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP12(2019)155 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP12(2019)155
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| Verfasserangaben: | the LHCb collaboration |
| Zusammenfassung: | A measurement of the time-dependent CP-violating asymmetry in Bs0→ϕϕ$$ {B}_s^0\to \phi \phi $$ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb−1 collected by the LHCb experiment at centre-of-mass energies s$$ \sqrt{s} $$ = 7 TeV in 2011, 8 TeV in 2012 and 13 TeV in 2015 and 2016, a signal yield of around 9000 Bs0→ϕϕ$$ {B}_s^0\to \phi \phi $$ decays is obtained. The CP-violating phase ϕsss¯s$$ {\phi}_s^{s\overline{s}s} $$ is measured to be −0.073 ± 0.115(stat) ± 0.027(syst) rad, under the assumption it is independent of the helicity of the ϕϕ decay. In addition, the CP-violating phases of the transverse polarisations under the assumption of CP conservation of the longitudinal phase are measured. The helicity-independent direct CP-violation parameter is also measured, and is found to be |λ| = 0.99 ± 0.05(stat) ± 0.01(syst). In addition, T-odd triple-product asymmetries are measured. The results obtained are consistent with the hypothesis of CP conservation in b¯→s¯ss¯s$$ \overline{b}\to \overline{s}s\overline{s}s $$ transitions. Finally, a limit on the branching fraction of the B0 → ϕϕ decay is determined to be BB0→ϕϕ<2.7×10−8$$ \mathcal{B}\left({B}^0\to \phi \phi \right)<2.7\times {10}^{-8} $$ at 90 % confidence level. |
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| Beschreibung: | The LHCb collaboration: R. Aaij, S. Bachmann, D. Berninghoff, M. Borsato, S. Braun, J. A. Comerma-Montells, P. d'Argent, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, M. Kolpin, R. Kopecna, B. Leverington, H. Malygina, J. Marks, D.S. Mitzel, S. Neubert, A. Piucci, Skidmore, S. Stahl, S. Stemmle, U. Uwer, M. Zavertyaevc [und 847 weitere Autoren] Gesehen am 14.05.2020 Im Titel ist "s" tiefgestellt, "0" hochgestellt |
| Beschreibung: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP12(2019)155 |