Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-

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dc.creatorBelle Collaboration
dc.creatorHorii, Y.
dc.creatorTrabelsi, K.
dc.creatorYamamoto, H.
dc.date2008-04-13
dc.date2008-10-30
dc.date.accessioned2026-07-07T11:49:48Z
dc.date.available2026-07-07T11:49:48Z
dc.descriptionWe report a study of the suppressed B meson decay B^- -> D K^- followed by D -> K^+ π^-, where D indicates a D^0 or \bar{D}^0 state. The two decay paths interfere and provide information on the CP-violating angle ϕ_3. We use a data sample containing 657 x 10^6 B\bar{B} pairs recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- storage ring. We do not find significant evidence for the mode B^- -> D K^-, D -> K^+ π^-, and set an upper limit of r_B < 0.19, where r_B is the magnitude of the ratio of amplitudes |A(B^- -> \bar{D}^0 K^-)/A(B^- -> D^0 K^-)|. The decay B^- -> D π^-, D -> K^+ π^- is also analyzed as a reference, for which we observe a signal with 6.6σsignificance, and measure the charge asymmetry A_{Dπ} to be -0.02^{+0.15}_{-0.16}(stat) \pm 0.04(syst). In addition, the ratio B(B^- -> D^0 K^-)/B(B^- -> D^0 π^-) is measured to be [6.77 \pm 0.23(stat) \pm 0.30(syst)] x 10^{-2}.
dc.description6 pages, 3 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/0804.2063
dc.identifierhttp://arxiv.org/abs/0804.2063
dc.identifierPhys.Rev.D78:071901,2008
dc.identifierdoi:10.1103/PhysRevD.78.071901
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203364
dc.subjectHigh Energy Physics - Experiment
dc.titleStudy of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-
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