This report summarises important technical challenges and their solutions in the calculation of the next-to-next-to-leading order QCD corrections to the width difference ΔΓₛ in the Bₛ-B̄ₛ system. We focus on the treatment of spinor structures with products of up to 22 γ matrices by means of projection and tensor integrals. Moreover, we present an approach for the semi-numeric computation of master integrals.
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Pascal Reeck (2024) studied this question.
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