B0(t) -> DPP time-dependent Dalitz plots, CP-violating angles 2beta, 2beta+gamma, and discrete ambiguities

Details B0(t) -> DPP time-dependent Dalitz plots, CP-violating angles 2beta, 2beta+gamma, and discrete ambiguities B0(t) -> DPP time-dependent Dalitz plots, CP-violating angles 2beta, 2beta+gamma, and discrete ambiguities

1998-01-20

arxiv.org/abs/hep-ph/9801363v3

Phys.Lett. B425 (1998) 375; Erratum-ibid. B433 (1998) 441

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 4 figures, Latex2e, graphicx. To appear in Phys. Lett. B. This version includes an erratum sent to PLB: the wrong re

Scientific paper

10.1016/S0370-2693(98)00250-0

We study CP-violation in resonant three-body B -> DPP decays, where PP stands for either Dpi, DK_S, pipi or piK_S. Analogously to the B -> 3pi channel and the extraction of 2alpha, the first three channels are shown to measure cos(2beta) in addition to sin(2beta), thus allowing to resolve the beta -> pi/2 -beta ambiguity, while the DpiK_S final state leads to a measurement of 2beta+gamma. The B0(t) -> D+D-pi0 channel via the interference between D** orbitally excited resonances is taken as an example, although this Cabibbo-suppressed decay suffers from irreducible penguin uncertainties. Then two penguin-free and Cabibbo-dominant modes are proposed: B0(t) -> D+D-K_S with the D_s** resonances, and B0(t) -> D0_CP pi+pi- with the D** plus the rho. Finally, the B0(t) -> D+-pi-+K_S channel with the D_s** and K* resonances provides a new clean method to measure the unusual angle 2beta+gamma. We present in all cases a crude estimate of the number of cos(2beta) (respectively 2beta+gamma) sensitive events. We show that this number is an increasing function of the resonance mass, a favorable situation compared to the more extensively studied three-pion Dalitz plot. However, the poor detection efficiency of the D mesons could pose a problem. As an annex and speculative application of these Dalitz plot based methods, the penguin-dominated B0(t) -> K_SK_SK_L decay also measures 2beta.

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