Author

M. Czaja

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Preprint Oct 2026

Two-loop helicity amplitudes for $gg\to W^+W^-$ using high-energy and forward expansions

We calculate next-to-leading order QCD corrections for the process $gg \to W^+W^-$ with two off-shell $W$ bosons, accounting for virtual top quarks in the loop diagrams. Our approach relies on combining expansions valid in different regions of phase space. Specifically, we perform a high-energy expansion in which the M...

M. Czaja, Ben Rott, Matthias Steinhauser et al. · 0 citations

Preprint Aug 2026

The inclusive $\bar B \to X_s \gamma$ decay rate with higher precision

We present a new and upgraded analysis of the inclusive weak radiative decay of the $B$ meson in the standard model and beyond. The ${\mathcal O}(\alpha_s)$ perturbative corrections are included in a formally complete manner. At the order $\alpha_s^2$, exact dependence on the charm quark mass is calculated for the domi...

M. Misiak, H. M. Asatrian, K. Brune et al. · 0 citations

Preprint Aug 2026

NNLO QCD corrections to the weak radiative $B$-meson decay with exact dependence on $m_c$

The inclusive weak radiative $B$-meson decay provides important constraints on many popular extensions of the Standard Model. Some of the numerically relevant Next-to-Next-to-Leading-Order QCD corrections to its branching ratio have so far been evaluated using an interpolation in the charm quark mass between the $m_c=0...

M. Czaja, M. Czakon, T. Huber et al. · 1 citation