CP asymmetry in flavour-specific B decays

2004/06/26 by Ulrich Nierste, Nierste, Ulrich · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics #Superconducting Materials and Applications #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0406300

7 pages, extended version of talk at Moriond conference on Electroweak Interactions and Unified Theories, 2004. Mistake in Eq. (13) corrected

openalex publication_date 2004/06/26 · arxiv created 2006/07/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I first discuss the phenomenology of a^q_fs (q=d,s), which is the CP asymmetry in flavour-specific B_q decays such as B_d -> X l⁺ nu-bar_l or B_s -> D_s^- pi⁺. a^q_fs can be obtained from the time evolution of any untagged B_q decay. Then I present recently calculated next-to-leading-order QCD corrections to a_fs^q, which reduce the renormalisation scheme uncertainties significantly. For the Standard Model we predict a^d_fs=-(5.0 +/- 1.1)*10^(-4) and a^s_fs= (2.1 +/-0.4)*10^-5. As a by-product we determine the ratio of the width difference in the B_d system and the average B_d width to (Delta Gamma_d)/Gamma_d = (3.0 +/- 1.2)*10^(-3) at next-to-leading order in QCD.

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• Complete next-to-next-to-leading order QCD corrections to the decay matrix in \boldsymbolB-meson mixing at leading power

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