Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Flavour physics 1

T 22.3: Talk

Monday, March 4, 2024, 16:30–16:45, Geb. 30.41: HS 4

Towards a full NNLO QCD calculation of Δ Γ in the B-B system — •Pascal Reeck¹, Matthias Steinhauser¹, Ulrich Nierste¹, and Vladyslav Shatbovenko² — ¹Karlsruhe Institute of Technology — ²University of Siegen

In this talk I will discuss recent advances made in the calculation of the NNLO QCD corrections to the width difference between B and B mesons. This work focuses on the perturbative high-energy part of the calculation, more specifically the matching coefficients between the Δ B = 1 effective operators of the Weak Interaction and the Δ B = 2 transition operator are calculated as a deep expansion in m_c/m_b.

This calculation yields novel results for the NNLO contributions with penguin operators which had not been considered previously at this order. Moreover, the NNLO contributions with two current-current operators, which were previously only known up to O(m_c/m_b), are calculated to a higher precision.

Keywords: Effective field theory; Perturbative QCD; High precision; B mesons