1998/01/31 by J Charles, J. Charles, A. Le Yaouanc +7 · 3 citations
Physics and Astronomy · #Channel (broadcasting) #Dalitz plot #Excited state #Interference (communication) #Measure (data warehouse) #Meson #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #hep-ex #hep-ph
paper · pdf · doi:10.1016/s0370-2693(98)00250-0
published as Phys.Lett.B425:375,1998; Erratum-ibid.B433:441,1998 · 17 pages, 4 figures, Latex2e, graphicx. To appear in Phys. Lett. B. This version includes an erratum sent to PLB: the wrong remark about untagged events has been removed. Minor misprints in Eqs. (5), (9) and (24) corrected
openalex publication_date 1998/04/01 · arxiv created 1998/05/19 · arxiv updated 2014/11/17 · openalex created_date 2017/10/20 · openalex updated_date 2026/08/05
We study CP-violation in resonant three-body B -> DPP decays, where PP stands for either Dpi, DKS, pipi or piKS. 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 DpiKS 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-KS with the Ds** resonances, and B0(t) -> D0CP pi+pi- with the D** plus the rho. Finally, the B0(t) -> D+-pi-+KS channel with the Ds** 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) -> KSKSKL decay also measures 2beta.