Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Stefano Pozzorini"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 10, Pp 1-81 (2023)
Abstract The increasingly high accuracy of top-quark studies at the LHC calls for a theoretical description of t t ¯ $$ t\overline{t} $$ production and decay in terms of exact matrix elements for the full 2 → 6 process that includes the off-shell
Externí odkaz:
https://doaj.org/article/108334cfaf9f4b468229900e7d67a9a3
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 5, Pp 1-48 (2022)
Abstract We present a new and fully general algorithm for the automated construction of the integrands of two-loop scattering amplitudes. This is achieved through a generalisation of the open-loops method to two loops. The core of the algorithm consi
Externí odkaz:
https://doaj.org/article/ab038f99f5cd489b85ede674f1683fea
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 1, Pp 1-57 (2022)
Abstract Rational counterterms are a key ingredient for the automation of loop calculations through numerical methods. Building on the recently established properties of rational terms of UV origin at two loops, in this paper we present a systematic
Externí odkaz:
https://doaj.org/article/58037d5772c14fe98fc9ac82f78fc634
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 10, Pp 1-53 (2020)
Abstract Scattering amplitudes in D dimensions involve particular terms that originate from the interplay of UV poles with the (D − 4)-dimensional parts of loop numerators. Such contributions can be controlled through a finite set of process-indepe
Externí odkaz:
https://doaj.org/article/7d35b3f1795047c4abbc7de08560925b
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 5, Pp 1-37 (2020)
Abstract The advent of efficient numerical algorithms for the construction of one-loop amplitudes has played a crucial role in the automation of NLO calculations, and the development of similar algorithms at two loops is a natural strategy for NNLO a
Externí odkaz:
https://doaj.org/article/7b9d0e5e7adc42eea2253395f44cbab4
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 12, Pp 1-38 (2019)
Abstract Theoretical predictions for t t ¯ $$ \overline{t} $$ b b ¯ $$ \overline{b} $$ production are of crucial importance for t t ¯ $$ \overline{t} $$ H measurements in the H → b b ¯ $$ \overline{b} $$ channel at the LHC. To address the large
Externí odkaz:
https://doaj.org/article/20d1edb52e6b4dd0ae94e4b5cd4ff50d
Autor:
Federico Buccioni, Jean-Nicolas Lang, Jonas M. Lindert, Philipp Maierhöfer, Stefano Pozzorini, Hantian Zhang, Max F. Zoller
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 10, Pp 1-56 (2019)
Abstract We present the new version of OpenLoops, an automated generator of tree and one-loop scattering amplitudes based on the open-loop recursion. One main novelty of OpenLoops 2 is the extension of the original algorithm from NLO QCD to the full
Externí odkaz:
https://doaj.org/article/d8833a840bb146fc85edc51f0ddec084
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 6, Pp 1-29 (2018)
Abstract Measurements of $$t \bar{t} H$$ tt¯H production in the $$H\rightarrow b \bar{b} $$ H→bb¯ channel depend in a critical way on the theoretical uncertainty associated with the irreducible $$t \bar{t} +b$$ tt¯+b -jet background. In this pap
Externí odkaz:
https://doaj.org/article/e6caa2dcd3a649928e1d3af36bcc491c
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 1, Pp 1-35 (2018)
Abstract Building on the open-loop algorithm we introduce a new method for the automated construction of one-loop amplitudes and their reduction to scalar integrals. The key idea is that the factorisation of one-loop integrands in a product of loop s
Externí odkaz:
https://doaj.org/article/9577354bc10d4584988372c48919c9ed
Autor:
Stefan Höche, Frank Krauss, Philipp Maierhöfer, Stefano Pozzorini, Marek Schönherr, Frank Siegert
Publikováno v:
Physics Letters B, Vol 748, Iss C, Pp 74-78 (2015)
We present differential cross sections for the production of top-quark pairs in conjunction with up to two jets, computed at next-to-leading order in perturbative QCD and consistently merged with a parton shower in the Sherpa+OpenLoops framework. Top
Externí odkaz:
https://doaj.org/article/b315b95b72174ebd821ef1bed8fbdec3