Measurement of the CKM angle γγ using B0→DK∗0B0→DK∗0 with D→K0Sπ+π−D→KS0π+π− decays

LHCb Collaboration

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    A model-dependent amplitude analysis of the decay B0 → D(KS0π+π−)K∗ 0 is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded at s√=7s=7 and 8 TeV by the LHCb experiment. The CP violation observables x± and y±, sensitive to the CKM angle γ, are measured to bex−=−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,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+=−0.65−0.23+0.24±0.08±0.01,where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the D → KS0π+π− amplitude model. These are the most precise measurements of these observables. They correspond to γ = (80− 22+ 21)° and rB0=0.39±0.13rB0=0.39±0.13 , where rB0rB0 is the magnitude of the ratio of the suppressed and favoured B0 → DK+π− decay amplitudes, in a Kπ mass region of ±50 MeV around the K*(892)0 mass and for an absolute value of the cosine of the K*0 decay angle larger than 0.4.
    Original languageEnglish
    Article number137
    JournalThe Journal of High Energy Physics
    Issue number8
    Early online date24 Aug 2016
    Publication statusPublished - 24 Aug 2016


    • B physics
    • CKM angle gamma
    • CP violation
    • Flavor physics
    • Hadron-Hadron scattering (experiments)


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