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CERN Document Server 6 registres trobats  La cerca s'ha fet en 0.65 segons. 
1.
Nonleptonic $B$-meson decays to next-to-next-to-leading order / Egner, Manuel (KIT, Karlsruhe, TTP) ; Fael, Matteo (CERN) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute next-to-next-to-leading order QCD corrections to the partonic processes $b\to c \bar{u} d$ and $b\to c \bar{c} s$, which constitute the dominant decay channels in standard model predictions for $B$-meson lifetimes within the heavy quark expansion. We consider the contribution from the four-quark operators $O_1$ and $O_2$ in the $\Delta B =1$ effective Hamiltonian. [...]
arXiv:2406.19456; CERN-TH-2024-089; P3H-24-041; TTP24-020; ZU-TH 30/24.- 2024-10-22 - 36 p. - Published in : JHEP 2410 (2024) 144 Fulltext: 2406.19456 - PDF; document - PDF;
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2.
Heavy-to-light form factors to three loops / Fael, Matteo (CERN) ; Huber, Tobias (Siegen U.) ; Lange, Fabian (Zurich U. ; PSI, Villigen) ; Müller, Jakob (Siegen U.) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop corrections of $\mathcal{O}(\alpha_{s}^3)$ to form factors with one massive and one massless quark coupling to an external vector, axialvector, scalar, pseudoscalar, or tensor current. We obtain analytic results for the color-planar contributions, for the contributions of light-quark loops, and the contributions with two heavy-quark loops. [...]
arXiv:2406.08182; CERN-TH-2024-064; P3H-24-036; PSI-PR-24-13; SI-HEP-2024-14; TTP24-017; SI-HEP-2024-14, TTP24-017; ZU-TH28/24.- 2024-09-01 - 51 p. - Published in : Phys. Rev. D 110 (2024) 056011 Fulltext: PDF;
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3.
Three-loop $b\to s\gamma$ vertex with current-current operators / Fael, Matteo (CERN) ; Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop vertex corrections to $b\to s\gamma$ induced by current-current operators. The results are presented as expansions in $m_c/m_b$ with numerical coefficients which allow to cover all relevant values for the heavy quark masses in different renormalization schemes. [...]
arXiv:2309.14706; CERN-TH-2023-148; P3H-23-059; TTP23-035; ZU-TH 56/23.- 2023-11-23 - 21 p. - Published in : JHEP 2311 (2023) 166 Fulltext: 2309.14706 - PDF; Publication - PDF;
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4.
Revisiting semileptonic $B$ meson decays at next-to-next-to-leading order / Egner, Manuel (KIT, Karlsruhe, TTP) ; Fael, Matteo (CERN) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute next-to-next-to-leading order corrections to the semileptonic decay rate of $B$ mesons for arbitrary values of the final-state quark mass. For the contribution with one massive quark in the final state, we extend the literature result and obtain analytic expressions in terms of iterated integrals. [...]
arXiv:2308.01346; P3H-23-053; TTP23-030; ZU-TH 41/23; CERN-TH-2023-151.- 2023-09-18 - 25 p. - Published in : JHEP 2309 (2023) 112 Fulltext: 2308.01346 - PDF; document - PDF;
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5.
Recent 3-Loop Heavy Flavor Corrections to Deep-Inelastic Scattering / Blümlein, Johannes (DESY, Zeuthen) ; Behring, Arnd (DESY, Zeuthen ; CERN) ; Goedicke, Alexander (DESY, Zeuthen ; Linz U.) ; von Manteuffel, Andreas (Regensburg U. ; Michigan State U.) ; Schneider, Carsten (Linz U.) ; Schönwald, Kay (DESY, Zeuthen ; Zurich U.) ; Ablinger, Jakob (Linz U.) ; De Freitas, Abilio (DESY, Zeuthen ; Linz U.)
We report on recent progress in calculating the three loop QCD corrections of the heavy flavor contributions in deep--inelastic scattering and the massive operator matrix elements of the variable flavor number scheme. Notably we deal with the operator matrix elements $A_{gg,Q}^{(3)}$ and $A_{Qg}^{(3)}$ and technical steps to their calculation. [...]
arXiv:2306.16550; DESY-23-089; DO-TH 23/09; CERN-TH-2023-122; ZU-TH 29/23; RISC Report Series 23-09; MSUHEP-23-018.- 2023-08-21 - 7 p.
- Published in : PoS: RADCOR2023 (2024) , pp. 046 Fulltext: document - PDF; 2306.16550 - PDF;
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6.
Massive three-loop form factors: anomaly contribution / Fael, Matteo (CERN) ; Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop corrections to the singlet form factors for massive quarks using a semi-analytic method which provides precise results over the whole kinematic range. Particular emphasis is put on the anomaly contribution originating from an external axial-vector current. [...]
arXiv:2302.00693; CERN-TH-2023-012; P3H-23-006; TTP23-002; ZU-TH 05/23.- 2023-05-01 - 21 p. - Published in : Phys. Rev. D 107 (2023) 094017 Fulltext: 2302.00693 - PDF; Publication - PDF;
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Vegeu també: autors amb noms similars
5 Schönwald, K.
1 Schönwald, Kay,
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