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7 papers found.
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Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization

We evaluate in the framework of QCD factorization the two-loop vertex corrections to the decays \( {\overline{B}}_{(s)}\to {D}_{(s)}^{\left(\ast \right)+}{L}^{-} \) and Λ b → Λ c + L −, where L is a light meson from the set {π, ρ, K (∗) , a 1}. These decays are paradigms of the QCD factorization approach since only the colour-allowed tree amplitude contributes at leading power...

Master integrals for the two-loop penguin contribution in non-leptonic B-decays

We compute the master integrals that arise in the calculation of the leading penguin amplitudes in non-leptonic B-decays at two-loop order. The application of differential equations in a canonical basis enables us to give analytic results for all master integrals in terms of iterated integrals with rational weight functions. It is the first application of this method to the case...

Inclusive \( \overline{B}\to {X}_s{\ell}^{+}{\ell}^{-} \) : complete angular analysis and a thorough study of collinear photons

We investigate logarithmically enhanced electromagnetic corrections of all angular observables in inclusive \( \overline{B}\to {X}_s{\ell}^{+}{\ell}^{-} \). We present analytical results, which are supplemented by a dedicated Monte Carlo study on the treatment of collinear photons in order to determine the size of the electromagnetic logarithms. We then give the Standard Model...

Four-body contributions to \( \overline{B}\to {X}_s\gamma \) at NLO

Tobias Huber Michal Poradzinski 0 Javier Virto D- Siegen Germany PL- Warsaw Poland Open Access c The Authors. 0 Faculty of Physics, University of Warsaw Ongoing efforts to reduce the perturbative

The (Q 7 , Q 1,2) contribution to \( \overline{B}\to {X}_s\gamma \) at \( \mathcal{O}\left({\alpha}_{\mathrm{s}}^2\right) \)

Interference between the photonic dipole operator Q 7 and the current-current operators Q 1,2 gives one of the most important QCD corrections to the (\( \overline{B}\to {X}_s\gamma \) decay rate. So far, the \( \mathcal{O}\left({\alpha}_{\mathrm{s}}^2\right) \)) part of this correction has been known in the heavy charm quark limit only (m c ≫ m b /2). Here, we evaluate this part...

Novel epithelial cell models

Introduction and Aims: The serin/threonine kinase mTOR plays a pivotal role in orchestrating cellular homeostasis and stress response and occurs in two distinct multiprotein complexes (mTOR-complex 1 and 2). In mTOR-complex 1, mTOR associates with raptor (regulatory-associated protein of mTOR) whereas in mTOR-complex 2 mTOR associates with rictor (rapamycin-insensitive companion...