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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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Autori principali: Aaij, Roel (Autore) , D'Argent, Philippe (Autore) , Bachmann, Sebastian (Autore) , Berninghoff, Daniel (Autore) , Braun, Svende (Autore) , De Cian, Michel (Autore) , Comerma-Montells, Albert (Autore) , Dordei, Francesca (Autore) , Dziewiecki, Michal (Autore) , Gerick, David (Autore) , Grünberg, Oliver (Autore) , Han, Xiaoxue (Autore) , Hansmann-Menzemer, Stephanie (Autore) , Heß, Miriam (Autore) , Kecke, Matthieu (Autore) , Khanji, Basem (Autore) , Kolpin, Michael (Autore) , Kopecná, Renata (Autore) , Leverington, Blake (Autore) , Marks, Jörg (Autore) , Meinert, Nis (Autore) , Mitzel, Dominik (Autore) , Neubert, Sebastian (Autore) , Neuner, Max (Autore) , Piucci, Alessio (Autore) , Stahl, Marian (Autore) , Stemmle, Simon (Autore) , Tilburg, Jeroen van (Autore) , Uwer, Ulrich (Autore) , Viemann, Harald (Autore) , Waldi, Roland (Autore) , Zhelezov, Alexey (Autore) , Grabowski, Jascha (Autore)
Ente Autore: LHCb Collaboration (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: August 28, 2018
In: Journal of high energy physics
Year: 2018, Fascicolo: 8
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)176
Accesso online:Verlag, Volltext: https://doi.org/10.1007/JHEP08(2018)176
Testo
Note sull'autore:the LHCb collaboration
Descrizione
Riassunto: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
Descrizione del documento: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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Gesehen am 28.05.2019
Descrizione fisica:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)176

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