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. 10. A binned Dalitz plot analysis of B± → DK± decays, with D → K0S π+π− and D → K0S 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+ 11− 12 )∘, rB = 0.086+ 0.013− 0.014 , and δB = (101±11)o, 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+ 10− 9 )∘, rB = 0.080 ± 0.011, and δB = (110 ± 10)o. [ DOI ]

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