Journal of high energy physics 1808(08), 176 (2018). doi:10.1007/JHEP08(2018)176 A binned Dalitz plot analysis of B$^{±}$ → DK$^{±}$ decays, with D → K$_{S}^{0}$ π$^{+}$π$^{−}$ and D → K$_{S}^{0}$ K$^{+}$K$^{−}$, is used to perform a measurement of the CP-violating observables x$_{±}$ and y$_{±}$, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ. The analysis is performed without assuming any D decay model, through the use of information on the strong-phase variation over the Dalitz plot from the CLEO collaboration. Using a sample of proton-proton collision data collected with the LHCb experiment in 2015 and 2016, and corresponding to an integrated luminosity of 2.0 fb$^{−1}$, the values of the CP violation parameters are found to be x$_{−}$ = (9.0 ± 1.7 ± 0.7 ± 0.4) × 10$^{−2}$, y$_{−}$ = (2.1 ± 2.2 ± 0.5 ± 1.1) × 10$^{−2}$, x$_{+}$ = (−7.7 ± 1.9 ± 0.7 ± 0.4) × 10$^{−2}$, and y$_{+}$ = (−1.0 ± 1.9 ± 0.4 ± 0.9) × 10$^{−2}$. The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty (on the strong-phase measurements. These values are used to obtain γ = (87$_{− 12}^{+ 11}$ )$^{∘}$, r$_{B}$ = 0.086$_{− 0.014}^{+ 0.013}$ , and δ$_{B}$ = (101±11)°, where r$_{B}$ is the ratio between the suppressed and favoured B-decay amplitudes and δ$_{B}$ is the corresponding strong-interaction phase difference. This measurement is combined with the result obtained using 2011 and 2012 data collected with the LHCb experiment, to give γ = (80$_{− 9}^{+ 10}$ )$^{∘}$, r$_{B}$ = 0.080 ± 0.011, and δ$_{B}$ = (110 ± 10)°. Published by Springer Nature, Cham
Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), LHCb, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Journal of High Energy Physics Journal of High Energy Physics, 2018, 08, pp.176. ⟨10.1007/JHEP08(2018)176⟩ Journal of high energy physics : JHEP 2018(8), 176 (2018). doi:10.1007/JHEP08(2018)176 JHEP JHEP, 2018, 08, pp.176. ⟨10.1007/JHEP08(2018)176⟩ Journal of high energy physics 1808(08), 176 (2018). doi:10.1007/JHEP08(2018)176
ISSN:
1126-6708 1029-8479
DOI:
10.18154/RWTH-2020-10877
Popis:
Journal of high energy physics 1808(08), 176 (2018). doi:10.1007/JHEP08(2018)176 A binned Dalitz plot analysis of B$^{±}$ → DK$^{±}$ decays, with D → K$_{S}^{0}$ π$^{+}$π$^{−}$ and D → K$_{S}^{0}$ K$^{+}$K$^{−}$, is used to perform a measurement of the CP-violating observables x$_{±}$ and y$_{±}$, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ. The analysis is performed without assuming any D decay model, through the use of information on the strong-phase variation over the Dalitz plot from the CLEO collaboration. Using a sample of proton-proton collision data collected with the LHCb experiment in 2015 and 2016, and corresponding to an integrated luminosity of 2.0 fb$^{−1}$, the values of the CP violation parameters are found to be x$_{−}$ = (9.0 ± 1.7 ± 0.7 ± 0.4) × 10$^{−2}$, y$_{−}$ = (2.1 ± 2.2 ± 0.5 ± 1.1) × 10$^{−2}$, x$_{+}$ = (−7.7 ± 1.9 ± 0.7 ± 0.4) × 10$^{−2}$, and y$_{+}$ = (−1.0 ± 1.9 ± 0.4 ± 0.9) × 10$^{−2}$. The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty (on the strong-phase measurements. These values are used to obtain γ = (87$_{− 12}^{+ 11}$ )$^{∘}$, r$_{B}$ = 0.086$_{− 0.014}^{+ 0.013}$ , and δ$_{B}$ = (101±11)°, where r$_{B}$ is the ratio between the suppressed and favoured B-decay amplitudes and δ$_{B}$ is the corresponding strong-interaction phase difference. This measurement is combined with the result obtained using 2011 and 2012 data collected with the LHCb experiment, to give γ = (80$_{− 9}^{+ 10}$ )$^{∘}$, r$_{B}$ = 0.080 ± 0.011, and δ$_{B}$ = (110 ± 10)°. Published by Springer Nature, Cham
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