We illustrate how electron Parton Distribution Functions (PDFs) with next-to-leading collinear logarithmic accuracy must be employed in the context of perturbative predictions for high-energy e+e−-collision processes. In particular, we discuss how the renormalisation group equation evolution of such PDFs is affected by the presence of multiple fermion families and their respective mass thresholds, and by the dependences on the choices of the factorisation and renormalisation schemes. We study the impact of the uncertainties associated with the PDFs on physical cross sections, in order to arrive at realistic precision estimates for observables computed with collinear-factorisation formulae. We do so by presenting results for the production of a heavy neutral object as well as for tt¯ and W+W− pairs, including next-to-leading-order effects of electroweak origin.

Improving methods and predictions at high-energy e+e− colliders within collinear factorisation / V. Bertone, M. Cacciari, S. Frixione, G. Stagnitto, M. Zaro, X. Zhao. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2022:10(2022 Oct 13), pp. 89.1-89.60. [10.1007/JHEP10(2022)089]

Improving methods and predictions at high-energy e+e− colliders within collinear factorisation

G. Stagnitto;M. Zaro
Penultimo
;
2022

Abstract

We illustrate how electron Parton Distribution Functions (PDFs) with next-to-leading collinear logarithmic accuracy must be employed in the context of perturbative predictions for high-energy e+e−-collision processes. In particular, we discuss how the renormalisation group equation evolution of such PDFs is affected by the presence of multiple fermion families and their respective mass thresholds, and by the dependences on the choices of the factorisation and renormalisation schemes. We study the impact of the uncertainties associated with the PDFs on physical cross sections, in order to arrive at realistic precision estimates for observables computed with collinear-factorisation formulae. We do so by presenting results for the production of a heavy neutral object as well as for tt¯ and W+W− pairs, including next-to-leading-order effects of electroweak origin.
Higher Order Electroweak Calculations, Precision QED;
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/940717
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