NNLO QCD corrections to B-meson mixing

2021/10/22 by Vladyslav Shtabovenko, Shtabovenko, Vladyslav
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.2110.12044

openalex publication_date 2021/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report on the calculation of next-to-next-to-leading order (NNLO) QCD corrections to the width difference ΔΓ_s in the neutral B-meson mixing process B⁰_s - B⁰_s. These contributions represent an important step in the task of reducing the existing large perturbative errors in the theory prediction for ΔΓ_s and approaching the current experimental uncertainties. We explain the theoretical framework employed in this computation and point out important subtleties in the treatment of evanescent operators and the renormalization. Part of our new results is already available in the literature, while the remaining pieces are expected to be published later this year.

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