Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Robin Brüser"'
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
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 3, Pp 1-23 (2020)
Abstract We compute the 1-jettiness soft function for the decay of a heavy quark into a light quark jet plus colorless particles at three-loop order in soft-collinear effective theory. The 1-jettiness measurement fixes the total small light-cone mome
Externí odkaz:
https://doaj.org/article/4d39bbc013f44eb78e49b2ebb9d8b0ac
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-29 (2019)
Abstract We compute the fermionic contributions to the cusp anomalous dimension in QCD at four loops as an expansion for small cusp angle. As a byproduct we also obtain the respective terms of the four-loop HQET wave function anomalous dimension. Our
Externí odkaz:
https://doaj.org/article/5305d96f001743be819062b4ba5f1680
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 4, Pp 1-40 (2018)
Abstract Wilson lines capture important features of scattering amplitudes, for example soft effects relevant for infrared divergences, and the Regge limit. Beyond the leading power approximation, corrections to the eikonal picture have to be taken in
Externí odkaz:
https://doaj.org/article/dfbac92e57a440b1a2541192928d0a67
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 Letters
The angle-dependent cusp anomalous dimension governs divergences coming from soft gluon exchanges between heavy particles, such as top quarks. We focus on the matter-dependent contributions and compute the first truly non-planar terms. They appear at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c65a0d9376c245689f279f75ade84322
http://arxiv.org/abs/2007.04851
http://arxiv.org/abs/2007.04851
Publikováno v:
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018).
We review the current status of calculations of the HQET field anomalous dimension and the cusp anomalous dimension. In particular, we give the results at 4 loops for the quartic Casimir contribution, and for the full QED case, up to $\varphi^6$ in t
Publikováno v:
Physical Review Letters
We calculate the massless quark jet function to three-loop order. The quark jet function is a universal ingredient in SCET factorization for many collider and decay processes with quark initiated final state jets. Our three-loop result contributes to
Publikováno v:
Journal of High Energy Physics
Journal of High Energy Physics, Vol 2018, Iss 4, Pp 1-40 (2018)
Journal of High Energy Physics, Vol 2018, Iss 4, Pp 1-40 (2018)
Wilson lines capture important features of scattering amplitudes, for example soft effects relevant for infrared divergences, and the Regge limit. Beyond the leading power approximation, corrections to the eikonal picture have to be taken into accoun
Publikováno v:
Journal of High Energy Physics
In a bottom-up approach we investigate lepton-flavour violating processes τ → 3 ℓ that are mediated by New Physics encoded in effective-theory operators of dimension six. While the opportunity to scrutinize the underlying operator structure has