Model-independent measurement of the CKM angle γ using B0→DK∗0 decays with D→K0Sπ+π− and K0SK+K−

Abstract : A binned Dalitz plot analysis of the decays B0→DK∗0, with D→K0Sπ+π− and K0SK+K−, is performed to measure the observables x± and y±, which are related to the CKM angle γ and the hadronic parameters of the decays. The D decay strong phase variation over the Dalitz plot is taken from measurements performed at the CLEO-c experiment, making the analysis independent of the D decay model. With a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0fb−1, collected by the LHCb experiment, the values of the CP violation parameters are found to be x+=0.05±0.35±0.02, x−=−0.31±0.20±0.04, y+=−0.81±0.28±0.06 and y−=0.31±0.21±0.05, where the first uncertainties are statistical and the second systematic. These observables correspond to values γ = (71±20)∘, rB0=0.56±0.17 and δB0=(204+21−20)∘. The parameters rB0 and δB0 are the magnitude ratio and strong phase difference between the suppressed and favoured B0 decay amplitudes, and have been measured in a region of ±50 MeV/c2 around the K∗(892)0 mass and with the magnitude of the cosine of the K∗(892)0 helicity angle larger than 0.4.
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Submitted on : Tuesday, April 12, 2016 - 11:21:08 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Model-independent measurement of the CKM angle γ using B0→DK∗0 decays with D→K0Sπ+π− and K0SK+K−. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 06, pp.131. ⟨10.1007/JHEP06(2016)131⟩. ⟨in2p3-01301436⟩

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