We study the decays B-→D*0π- and B-→D*0K-, where the D*0 decays into D0π0, with the D0 reconstructed in the CP-even (CP+) eigenstates K-K+ and π-π+ and in the (non-CP) channels K-π+, K-π+π+π-, and K-π+π0. Using a sample of about 123×10^6 BB̅ pairs, we measure the ratios of decay rates Rnon-CP*≡B(B-→Dnon-CP*0K-)/B(B-→Dnon-CP*0π-)=0.0813±0.0040(stat)-0.0031+0.0042(syst), and provide the first measurements of RCP+*≡B(B-→DCP+*0K-)/B(B-→DCP+*0π-)=0.086±0.021(stat)±0.007(syst), and of the CP asymmetry ACP+*≡B(B-→DCP+*0K-)-B(B+→DCP+*0K+)/B(B-→DCP+*0K-)+B(B+→DCP+*0K+)=-0.10±0.23(stat)-0.04+0.03(syst).
Measurement of the ratio B(B-→D*0K-)/B(B-→D*0π-) and of the CP asymmetry of B-→DCP+*0K- decays
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2005
Abstract
We study the decays B-→D*0π- and B-→D*0K-, where the D*0 decays into D0π0, with the D0 reconstructed in the CP-even (CP+) eigenstates K-K+ and π-π+ and in the (non-CP) channels K-π+, K-π+π+π-, and K-π+π0. Using a sample of about 123×10^6 BB̅ pairs, we measure the ratios of decay rates Rnon-CP*≡B(B-→Dnon-CP*0K-)/B(B-→Dnon-CP*0π-)=0.0813±0.0040(stat)-0.0031+0.0042(syst), and provide the first measurements of RCP+*≡B(B-→DCP+*0K-)/B(B-→DCP+*0π-)=0.086±0.021(stat)±0.007(syst), and of the CP asymmetry ACP+*≡B(B-→DCP+*0K-)-B(B+→DCP+*0K+)/B(B-→DCP+*0K-)+B(B+→DCP+*0K+)=-0.10±0.23(stat)-0.04+0.03(syst).File in questo prodotto:
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