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Measurement of the CKM angle γ using B±→DK± with D→K0Sπ+π−, K0SK+K− decays

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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 th...

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Autores principales: Aaij, Roel (Autor) , D'Argent, Philippe (Autor) , Bachmann, Sebastian (Autor) , Berninghoff, Daniel (Autor) , Braun, Svende (Autor) , De Cian, Michel (Autor) , Comerma-Montells, Albert (Autor) , Dordei, Francesca (Autor) , Dziewiecki, Michal (Autor) , Gerick, David (Autor) , Grünberg, Oliver (Autor) , Han, Xiaoxue (Autor) , Hansmann-Menzemer, Stephanie (Autor) , Heß, Miriam (Autor) , Kecke, Matthieu (Autor) , Khanji, Basem (Autor) , Kolpin, Michael (Autor) , Kopecná, Renata (Autor) , Leverington, Blake (Autor) , Marks, Jörg (Autor) , Meinert, Nis (Autor) , Mitzel, Dominik (Autor) , Neubert, Sebastian (Autor) , Neuner, Max (Autor) , Piucci, Alessio (Autor) , Stahl, Marian (Autor) , Stemmle, Simon (Autor) , Tilburg, Jeroen van (Autor) , Uwer, Ulrich (Autor) , Viemann, Harald (Autor) , Waldi, Roland (Autor) , Zhelezov, Alexey (Autor) , Grabowski, Jascha (Autor)
Autor Corporativo: LHCb Collaboration (Autor)
Formato: Article (Journal)
Lenguaje:inglés
Publicado: August 28, 2018
In: Journal of high energy physics
Year: 2018, Número: 8
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)176
Acceso en línea:Verlag, Volltext: https://doi.org/10.1007/JHEP08(2018)176
Enlace del recurso
Notas de Autor:the LHCb collaboration
Descripción
Sumario: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 )∘, rB = 0.086 − 0.014 + 0.013 , and δB = (101±11)°, where rB is the ratio between the suppressed and favoured B-decay amplitudes and δB 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 )∘, rB = 0.080 ± 0.011, and δB = (110 ± 10)°. Open image in new window
Notas:The LHCb collaboration: R. Aaij, P. d'Argent, S. Bachmann, D. Berninghoff, S. Braun, A. Comerma-Montells, M. De Cian, F. Dordei, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, R. Kopecna, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, A. Piucci, M. Stahl, S. Stemmle, J. van Tilburg, U. Uwer, A. Zhelezov [und weitere]
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Descripción Física:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)176

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