Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 9: Flavour Physics I

T 9.7: Talk

Monday, March 31, 2025, 18:15–18:30, VG 1.104

B-B mixing to NNLO including penguin contributions — •Pascal Reeck¹, Matthias Steinhauser¹, Ulrich Nierste¹, and Vladyslav Shtabovenko² — ¹Karlsruher Institute für Technologie — ²Universität 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_c²/m_b²) are calculated to a higher precision.

Keywords: QCD; Perturbative QFT; Effective field theory; NNLO