Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Matthias Steinhauser"'
Publikováno v:
Physical Review
We compute two-loop corrections to the vector current matching coefficient involving two heavy quark masses. The result is applied to the computation of the ϒ(1S) decay width into an electron or muon pair. We complement the next-to-next-to-next-to-l
Publikováno v:
Journal of High Energy Physics. 2020
Strengthening constraints on new physics from the $$ \overline{B}\to {X}_s\gamma $$ branching ratio requires improving accuracy in the measurements and the Standard Model predictions. To match the expected Belle-II accuracy, Next-to-Next-to-Leading O
Publikováno v:
Proceedings of 14th International Symposium on Radiative Corrections — PoS(RADCOR2019).
The inclusive radiative decay of the $B$ meson is known to provide strong constraints on many popular extensions of the Standard Model. Such constraints crucially depend on precision of the Standard Model predictions. One of the main contributions to
Autor:
M. Misiak, Matthias Steinhauser
Publikováno v:
Nuclear Physics B. 764:62-82
One of the most troublesome contributions to the NNLO QCD corrections to B ¯ → X s γ originates from three-loop matrix elements of four-quark operators. A part of this contribution that is proportional to the QCD beta-function coefficient β 0 wa
Publikováno v:
Nuclear Physics B. 716:303-318
We compute the third-order corrections to the heavy quarkonium spectrum and production/annihilation rates due to the leading renormalization group running of the static potential. The previously known complete O ( m q α s 5 ) result for the heavy qu
Publikováno v:
Physics Letters B. 593(1-4):124-134
We compute the hyperfine splitting in a heavy quarkonium composed of different flavors in next-to-leading logarithmic approximation using the nonrelativistic renormalization group. We predict the mass difference of the vector and pseudoscalar charm-b
Autor:
Dirk Seidel, Matthias Steinhauser, Jan Piclum, Alexander A. Penin, Y. Kiyo, Peter Marquard, Martin Beneke
Publikováno v:
Physical Review Letters. 112
We present the complete next-to-next-to-next-to-leading order short-distance and bound-state QCD correction to the leptonic decay rate $\mathrm{\ensuremath{\Gamma}}\mathbf{(}\mathrm{\ensuremath{\Upsilon}}(1S)\ensuremath{\rightarrow}{\ensuremath{\ell}
Autor:
Emmanuel Stamou, Thomas Hermann, Martin Gorbahn, Mikolaj Misiak, Matthias Steinhauser, Christoph Bobeth
Publikováno v:
Physical Review Letters. 112
We combine our new results for the O(αem) and O(αs2) corrections to Bs,d→l+l-, and present updated branching ratio predictions for these decays in the standard model. Inclusion of the new corrections removes major theoretical uncertainties of per
Autor:
Bernd A. Kniehl, Vladimir A. Smirnov, Antonio Morelos Pineda, Alexander A. Penin, Matthias Steinhauser
Publikováno v:
Physical Review Letters. 104
Autor:
Matthias Steinhauser
Publikováno v:
AIP Conference Proceedings.
We discuss new results obtained for the description of a system of two heavy quarks close to the production threshold. Special emphasis is put on the resummation of logarithms in the quark velocity. As physical applications we discuss the determinati