We present a measurement of the time-dependent CP-violating asymmetries in decays of neutral B mesons to the final states D*∓π±, using approximately 232×10^6 BB̅ events recorded by the BABAR experiment at the PEP-II e+e- storage ring. Events containing these decays are selected with a partial reconstruction technique, in which only the high-momentum π± from the B decay and the low-momentum π∓ from the D*∓ decay are used. We measure the parameters related to 2β+γ to be aD*π=-0.034±0.014±0.009 and cD*πℓ=-0.019±0.022±0.013. With some theoretical assumptions, we interpret our results in terms of the lower limits |sin(2β+γ)|>0.62(0.35) at 68% (90%) confidence level.
Measurement of time-dependent CP-violating asymmetries and constraints on sin(2β+γ) with partial reconstruction of B→D*∓π± decays
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2005
Abstract
We present a measurement of the time-dependent CP-violating asymmetries in decays of neutral B mesons to the final states D*∓π±, using approximately 232×10^6 BB̅ events recorded by the BABAR experiment at the PEP-II e+e- storage ring. Events containing these decays are selected with a partial reconstruction technique, in which only the high-momentum π± from the B decay and the low-momentum π∓ from the D*∓ decay are used. We measure the parameters related to 2β+γ to be aD*π=-0.034±0.014±0.009 and cD*πℓ=-0.019±0.022±0.013. With some theoretical assumptions, we interpret our results in terms of the lower limits |sin(2β+γ)|>0.62(0.35) at 68% (90%) confidence level.Pubblicazioni consigliate
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