Feldmann, Thorsten
Preferred name
Feldmann, Thorsten
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Publication Access status: Metadata only , Non-factorisable contributions of strong-penguin operators in Λb → Λℓ+ℓ− decays(2024); We investigate for the first time a certain class of non-factorisable contributions of the four-quark operators $$ \mathcal{O} $$ 3 − 6 in the weak effective Hamiltonian to the Λ b → Λ ℓ + ℓ − decay amplitude. We focus on the case where a virtual photon is radiated from one of the light constituents of the Λ b baryon, in the kinematic situation of large hadronic recoil with an energetic Λ baryon in the final state. The effect on the suitably defined “non-local form factors” is calculated using the light-cone sum rule approach for a correlator with an interpolating current for the light Λ baryon. We find that this approach requires the introduction of new soft functions that generalise the standard light-cone distribution amplitudes (LCDAs) for the heavy Λ b baryon. We give a heuristic discussion of their properties and a model that relates them to the standard LCDAs. Within this framework, we provide numerical results for the size of the non-local form factors considered.Source Type:Article12 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Strange-quark mass effects in the Bs meson’s light-cone distribution amplitudeWe investigate the differences between the light-cone distribution amplitudes (LCDAs) of B s mesons and B q mesons (with q = u , d ) induced by a non-vanishing strange-quark mass m s ≠ 0 (compared to m q ≃ 0). To this end, we consider the so-called “radiative tail” which is related to the short-distance expansion of the relevant light-ray operators in heavy-quark effective theory. We extend the calculation of the according matching coefficients, including operators linear in m s for both the leading and sub-leading 2-pArticle LCDAs. Based on a generic parameterization for the leading LCDA, we discuss the effect on its shape on a quantitative level, and compare our findings with recent results on the inverse moments of the B q and B s LCDAs from QCD sum rules.Source Type:Article2 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Structure-dependent QED effects in exclusive B-meson decays(2024); We review recent progress in the computation of structure-dependent QED corrections to exclusive B decays in the factorization approach.Source Type:Article2
