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Study of B0 -> D*- pi+ pi- pi+ and B0 -> D*- K+ pi- pi+ decays

Abstract : Using proton-proton collision data collected by the LHCb experiment at sqrt(s) = 7 TeV, corresponding to an integrated luminosity of 1.0 fb^{-1}, the ratio of branching fractions of the B0 -> D*- pi+ pi- pi+ decay relative to the B0 -> D*- pi+ decay is measured to be B(B0 -> D*- pi+ pi- pi+) / B(B0 -> D*- pi+) = 2.64 \pm 0.04 (stat.) \pm 0.13 (syst.). The Cabibbo-suppressed decay B0 -> D*- K+ pi- pi+ is observed for the first time and the measured ratio of branching fractions is B(B0 -> D*- K+ pi- pi+) / B(B0 -> D*- pi+ pi- pi+) = (6.47 \pm 0.37 (stat.) \pm 0.35 (syst.)) x 10^{-2}. A search for orbital excitations of charm mesons contributing to the B0 -> D*- pi+ pi- pi+ final state is also performed, and the first observation of the B0 -> Dbar_{1}(2420)^0 pi+ pi- decay is reported with the ratio of branching fractions B(B0 -> (Dbar_{1}(2420)^0 -> D*- pi+) pi- pi+) / B(B0 -> D*- pi+ pi- pi+) = (2.04 \pm 0.42 (stat.) \pm 0.22 (syst.)) x 10^{-2}, where the numerator represents a product of the branching fractions B(B0 -> Dbar_{1}(2420)^0 pi- pi+) and B(Dbar_{1}(2420)^0 -> D*- pi+).
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http://hal.in2p3.fr/in2p3-00805517
Contributor : Sabine Starita <>
Submitted on : Thursday, March 28, 2013 - 10:04:58 AM
Last modification on : Wednesday, December 2, 2020 - 4:40:02 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Study of B0 -> D*- pi+ pi- pi+ and B0 -> D*- K+ pi- pi+ decays. Physical Review D, American Physical Society, 2013, 87, pp.092001. ⟨10.1103/PhysRevD.87.092001⟩. ⟨in2p3-00805517⟩

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