Speaker
Pascal Reeck
Description
In this talk I will discuss recent advances made in the calculation of the NNLO QCD corrections to the width difference between B and anti-B mesons. This work focuses on the perturbative high-energy part of the calculation, more specifically the matching coefficients between the $\Delta B = 1$ effective operators of the Weak Interaction and the $\Delta B = 2$ 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 $O(m_c^2/m_b^2)$ are calculated to a higher precision.
