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Measurement of the CKM angle γ using B0→DK∗0 with D→K0Sπ+π− decays

Abstract : A model-dependent amplitude analysis of the decay B0→D(K0Sπ+π−)K∗0 is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb−1, recorded at s√=7 and 8TeV by the LHCb experiment. The CP violation observables x± and y±, sensitive to the CKM angle γ, are measured to be x−=−0.15±0.14±0.03±0.01,y−=0.25±0.15±0.06±0.01,x+=0.05±0.24±0.04±0.01,y+=−0.65+0.24−0.23±0.08±0.01, where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the D→K0Sπ+π− amplitude model. These are the most precise measurements of these observables. They correspond to γ=(80+21−22)∘ and rB0=0.39±0.13, where rB0 is the magnitude of the ratio of the suppressed and favoured B0→DK+π− decay amplitudes, in a Kπ mass region of ±50MeV around the K∗(892)0 mass and for an absolute value of the cosine of the K∗0 decay angle larger than 0.4.
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Contributor : Claudine Bombar <>
Submitted on : Friday, October 7, 2016 - 2:27:58 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:24 AM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the CKM angle γ using B0→DK∗0 with D→K0Sπ+π− decays. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 08, pp.137. ⟨10.1007/JHEP08(2016)137⟩. ⟨in2p3-01377705⟩



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