Measurement of cos(2beta) in B0 -> D(*)0 h0 decays with a time-dependent Dalitz plot analysis of D0 -> Ks pi+ pi-

2006/07/29 by The BABAR Collaboration, B. Aubert, Aubert, B.
Medicine · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0607105

20 pages, 8 postscript figues, submitted to ICHEP2006

arxiv created 2006/07/29 · openalex publication_date 2006/07/29 · arxiv updated 2009/12/01 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We report a preliminary measurement of cos2β in B⁰→ D^(*)0h⁰ decays with a time-dependent Dalitz plot analysis of D⁰→ K_Sπ⁺π^-, where h⁰ is a light neutral meson such as π⁰, η, η' or ω. The strong phase variation on the Dalitz plot allows the access to the angle β with only a two-fold ambiguity (β+π). Using 311× 10⁶ BB pairs collected at the Babar detector, we obtain cos2β= 0.54 ± 0.54 ± 0.08 ± 0.18, sin2β= 0.45 ± 0.36 ± 0.05 ± 0.07, and |λ| = 0.975^+0.093_-0.085 ± 0.012 ± 0.002 , where the first errors are statistical, the second are experimental systematic uncertainties, and the third are the signal Dalitz model uncertainties. This measurement favors the solution of β= 22^∘ over 68^∘ at an 87% confidence level.

Related

• First evidence for cos 2β>0 and resolution of the CKM Unitarity Triangle ambiguity by a time-dependent Dalitz plot analysis of B⁰ → D^(*) h⁰ with D → K_S⁰ π⁺ π^- decays
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