Determining Delta_Gamma_s / Gamma_s from Bf(B_s → D_s^(*)+ D_s(*)-) measurements at e⁺ e^- colliders running on the Y(5S) resonance

2006/04/06 by A. Drutskoy, Drutskoy, A.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ph/0604061

openalex publication_date 2006/04/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The feasibility of determining ΔΓ_s / Gamma_s from B_s → D_s^(*)+ D_s^(*)- decay branching fraction measurements at e⁺ e^- colliders running on the Υ(5S) resonance is discussed. The expected accuracies of the B_s → D_s^(*)+ D_s^(*)- branching fraction measurements and the ΔΓ_s / Γ_s determination with 50fb^-1 of data at the Υ(5S) are estimated using Monte Carlo simulation. Comparison of that measurement with a directly measured ΔΓ_s / Γ_s value within and beyond Standard Model is discussed. A new method of estimating ΔΓ_s / Γ_s is proposed, based on comparing the CP-even and CP-odd components in B⁰ → J/ΨK^*0 and B_s → J/Ψϕ decays. A comparison of B_s and B⁰ lifetime measurements with theoretical predictions is discussed.

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