Analyzing B_s - bar B_s mixing: Non-perturbative contributions to bag parameters from sum rules

2007/03/22 by T. Mannel, Thomas Mannel, Ben D. Pecjak +5
Engineering · Physics and Astronomy · #FOS: Physical sciences #Fault Detection and Control Systems #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0703244

31 pages, 5 figures

arxiv created 2007/03/22 · openalex publication_date 2007/03/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We use QCD sum rules to compute matrix elements of the Delta B=2 operators appearing in the heavy-quark expansion of the width difference of the B_s mass eigenstates. Our analysis includes the leading-order operators Q and Q_S, as well as the subleading operators R₂ and R₃, which appear at next-to-leading order in the 1/m_b expansion. We conclude that the violation of the factorization approximation for these matrix elements due to non-perturbative vacuum condensates is as low as 1-2%.

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