Measurement of the angle ϕ₃ with Dalitz analysis of three-body D⁰ decay from B→ D⁰ K process

2003/08/16 by Belle Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0308043

25 pages, 14 figures, contributed paper at Lepton Photon 2003

arxiv created 2003/08/16 · openalex publication_date 2003/08/16 · arxiv updated 2012/08/27 · openalex created_date 2022/09/02 · openalex updated_date 2026/07/28

Abstract

A new method to measure the angle ϕ₃ of the CKM unitarity triangle using a Dalitz analysis of the three-body decay of the D⁰ meson from the B→ D⁰ K process has been introduced recently. The method employs the interference between D⁰ and D⁰ to extract both the weak and strong phases. We present a study of statistical and systematic errors of this method using Monte Carlo simulation. A fit of the D⁰ Dalitz distribution has been performed based on a 140 fb^-1 sample collected by the Belle detector. We observe the indication of a CP asymmetry with the significance of 2.4 standard deviations. The 90% confidence interval obtained for the ϕ₃ value is 61^∘<ϕ₃<142^∘.

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