Study of B0→D*−π+π−π+ and B0→D*−K+π−π+ decays

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Vollhardt, A; Straumann, U (2013). Study of B0→D*−π+π−π+ and B0→D*−K+π−π+ decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), 87(9):092001.

Abstract

Using proton-proton collision data collected by the LHCb experiment at s√=7  TeV, corresponding to an integrated luminosity of 1.0  fb−1, the ratio of branching fractions of the B0→D*−π+π−π+ decay relative to the B0→D*−π+ decay is measured to be B(B0→D*−π+π−π+)B(B0→D*−π+) =2.64±0.04(stat)±0.13(syst). The Cabibbo-suppressed decay B0→D*−K+π−π+ is observed for the first time, and the measured ratio of branching fractions is B(B0→D*−K+π−π+)B(B0→D*−π+π−π+) =(6.47±0.37(stat)±0.35(syst))×10−2. A search for orbital excitations of charm mesons contributing to the B0→D*−π+π−π+ final state is also performed, and the first observation of the B0→D¯¯¯1(2420)0π+π− decay is reported with the ratio of branching fractions B(B0→(D¯¯¯1(2420)0→D*−π+)π−π+)B(B0→D*−π+π−π+) =(2.04±0.42(stat)±0.22(syst))×10−2, where the numerator represents a product of the branching fractions B(B0→D¯¯¯1(2420)0π−π+) and B(D¯¯¯1(2420)0→D*−π+).

Abstract

Using proton-proton collision data collected by the LHCb experiment at s√=7  TeV, corresponding to an integrated luminosity of 1.0  fb−1, the ratio of branching fractions of the B0→D*−π+π−π+ decay relative to the B0→D*−π+ decay is measured to be B(B0→D*−π+π−π+)B(B0→D*−π+) =2.64±0.04(stat)±0.13(syst). The Cabibbo-suppressed decay B0→D*−K+π−π+ is observed for the first time, and the measured ratio of branching fractions is B(B0→D*−K+π−π+)B(B0→D*−π+π−π+) =(6.47±0.37(stat)±0.35(syst))×10−2. A search for orbital excitations of charm mesons contributing to the B0→D*−π+π−π+ final state is also performed, and the first observation of the B0→D¯¯¯1(2420)0π+π− decay is reported with the ratio of branching fractions B(B0→(D¯¯¯1(2420)0→D*−π+)π−π+)B(B0→D*−π+π−π+) =(2.04±0.42(stat)±0.22(syst))×10−2, where the numerator represents a product of the branching fractions B(B0→D¯¯¯1(2420)0π−π+) and B(D¯¯¯1(2420)0→D*−π+).

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