Measurements of time-dependent CP Asymmetries in B → D^*∓ π^± decays using a partial reconstruction technique

2008/09/18 by S. Bahinipati, K. Trabelsi, Bahinipati, S. +3
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.0809.3203

openalex publication_date 2008/09/18 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We report preliminary results on time-dependent CP asymmetries in B → D^*∓π^± decays. The CP asymmetry in these decays is proportional to 2R_{D^* π} sin (2ϕ₁ + ϕ₃ ± δ_{D^* π}), where R_{D^* π} is the ratio of the magnitudes of the doubly-Cabibbo-suppressed and Cabibbo-favoured amplitudes, δ_{D^* π} is the strong phase difference between them, and ϕ₁ and ϕ₃ are two angles of the CKM Unitarity Triangle. This study is based on a large data sample that contains 657 million BB pairs collected with the Belle detector at the KEKB asymmetric-energy e⁺ e^- collider at the Υ(4S) resonance. We use a partial reconstruction technique, wherein signal B → D^*∓π^± events are identified using information only from the π^± from the B decay and the charged slow pion from the subsequent decay of the D^*-. We obtain S⁺ (D^* π) = +0.057 ± 0.019(stat) ± 0.012(sys) and S^- (D^* π) = +0.038 ± 0.020(stat) ± 0.010(sys).

Related

• Measurement of Time-Dependent CP Asymmetry in B⁰→ D^(*)±π^∓ Decays and Constraints on sin(2β+γ)
• Study of Time-Dependent CP Asymmetries with Partial Reconstruction of B -> D*+ pi-
• Measurement of CP-violating parameters in fully reconstructed B→ D^(*)π and B→ Dρ decays
• Measurement of the CP asymmetry in D⁺ → π⁺ π⁰ decays at Belle II
• Measurement of the CP asymmetry in D⁰→π⁺π^-π⁰ decays at Belle II