Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Jan Piclum"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 5, Pp 1-33 (2023)
Abstract We investigate the reduction of Feynman integrals to master integrals using Gröbner bases in a rational double-shift algebra Y in which the integration-by-parts (IBP) relations form a left ideal. The problem of reducing a given family of in
Externí odkaz:
https://doaj.org/article/74fb4dd5d8cf4a0986ac06a677f33a5e
Autor:
Jan Piclum, Christian Schwinn
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 3, Pp 1-47 (2018)
Abstract We construct a resummation at partial next-to-next-to-next-to-leading logarithmic accuracy for hadronic top-quark pair production near partonic threshold, including simultaneously soft-gluon and Coulomb corrections, and use this result to ob
Externí odkaz:
https://doaj.org/article/581fc17c9318448da483709c0fab9bbc
We report on an approach to integration-by-parts reduction based on Gr\"obner bases. We establish the underlying noncommutative rational double-shift algebra wherein the integration-by-parts relations form a left ideal. We describe in detail the one-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0008fe8232ec40cb2fdfb4171cb3538
http://arxiv.org/abs/2207.09275
http://arxiv.org/abs/2207.09275
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
Contrary to what was previously believed, two-loop radiative corrections to the $g$-factor of an electron bound in a hydrogen-like ion at $\mathcal{O}\left(\alpha^2 (Z\alpha)^5\right)$ exhibit logarithmic enhancement. This previously unknown contribu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ddcb632b16b2d6a145495dad7326c0ea
Publikováno v:
Computer Physics Communications. 209:96-115
We describe the QQbar_threshold library for computing the production cross section of heavy quark-antiquark pairs near threshold at electron-positron colliders. The prediction includes all presently known QCD, electroweak, Higgs, and nonresonant corr
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}
Publikováno v:
Physical Review Letters. 112
We present the complete result for the O(α7me) one photon annihilation contribution to the hyperfine splitting of the ground state energy levels in positronium. Numerically it increases the prediction of quantum electrodynamics by 217±1 kHz.