Showing papers by "Paolo Torrielli published in 2022"
TL;DR: In this article , the authors present a state-of-the-art calculation of the fiducial cross section and of differential distributions for this process at third order in the strict fixed-order expansion in the strong coupling, as well as including the all-order resummation of logarithmic corrections.
Abstract: The Drell-Yan process at hadron colliders is a fundamental benchmark for the study of strong interactions and the extraction of electroweak parameters. The outstanding precision of the LHC demands very accurate theoretical predictions with a full account of fiducial experimental cuts. In this Letter we present a state-of-the-art calculation of the fiducial cross section and of differential distributions for this process at third order in the strict fixed-order expansion in the strong coupling, as well as including the all-order resummation of logarithmic corrections. Together with these results, we present a detailed study of the subtraction technique used to carry out the calculation for different sets of experimental cuts, as well as of the sensitivity of the fiducial cross section to infrared physics. We find that residual theory uncertainties are reduced to the percent level and that the robustness of the predictions can be improved by a suitable adjustment of fiducial cuts.
21 citations
13 Sep 2022
TL;DR: In this article , a preliminary study of strongly-ordered soft and collinear multiple radiation from the point of view of factorisation is presented, which provides tools for a detailed organisation of subtraction algorithms, in principle to all orders in perturbation theory.
Abstract: After a brief introduction to the problem of subtraction of infrared divergences for high-order collider observables, we present a preliminary study of strongly-ordered soft and collinear multiple radiation from the point of view of factorisation. We show that the matrix elements of fields and Wilson lines that describe soft and collinear radiation in factorised scattering amplitudes can be re-factorised in strongly-ordered limits, providing a systematic method to compute them, to char-acterise their singularity structure, and to build local subtraction counterterms for strongly-ordered configurations. Our results provide tools for a detailed organisation of subtraction algorithms, in principle to all orders in perturbation theory.
2 citations
1 citations
20 Oct 2022
TL;DR: In this article , the state-of-the-art Local Analytic Sector subtraction (LAS) algorithm is presented for the massless case for the treatment of initial and nal-state radiations.
Abstract: We present the state of the art of the Local Analytic Sector subtraction. The scheme is now complete at NLO in the massless case for the treatment of initial- and final-state radiations. Its flexibility has been improved by the introduction of damping factors , which can be tuned to reduce numerical instabilities, though preserving the simplicity of the algorithm. The same degree of universality has been reached at NNLO for final-state radiation, where we derived fully analytic and compact results for all integrated counterterms. This allows us to explicitly check the cancellation of the virtual infrared singularities in generic processes with massless final-state partons.
1 citations
22 Jun 2022
TL;DR: Xuan Chen, Thomas Gehrmann, Nigel Glover, Alexander Huss, Pier Francesco Monni, Emanuele Re, Luca Rottoli3†, Paolo Torrielli as mentioned in this paper .
Abstract: Xuan Chen, Thomas Gehrmann, Nigel Glover, Alexander Huss, Pier Francesco Monni, Emanuele Re, Luca Rottoli3†, Paolo Torrielli 1 Institute for Theoretical Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany 2 Institute for Astroparticle Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany 3 Department of Physics, University of Zürich, CH-8057 Zürich, Switzerland 4 Institute for Particle Physics Phenomenology, Physics Department, Durham University, Durham DH1 3LE, UK 5 CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland 6 Dipartimento di Fisica G. Occhialini, U2, Università degli Studi di Milano-Bicocca and INFN, Sezione di Milano-Bicocca, Piazza della Scienza, 3, 20126 Milano, Italy 7 LAPTh, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, F-74940 Annecy, France 8 Dipartimento di Fisica and Arnold-Regge Center, Università di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125, Turin, Italy