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

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[1] Measurement of the ckm angle γ using b±→dk± with d→k0sπ+π− , k0sk+k− decays / А. В. Бережной, И. В. Горелов, А. К. Лефлат et al. // Journal of High Energy Physics. — 2018. — Vol. 2018, no. 8. A binned Dalitz plot analysis of B±→DK± decays, with D→K0Sπ+π− and D→K0SK+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 2.0fb−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+11−12)∘, rB=0.086+0.013−0.014, 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 experiment, to give γ=(80+10−9)∘, rB=0.080±0.011, and δB=(110±10)∘. [ DOI ]

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