We present the first results for the O(ααs) corrections to the total partonic cross section of the process qq→Z+X, with the complete set of contributions, that include photonic and massive weak gauge boson effects. The results are relevant for the precise determination of the hadronic Z boson production cross section. Virtual and real corrections are calculated analytically using the reduction to the master integrals and their evaluation through differential equations. Real corrections are dealt with using the reverse-unitarity method. They require the evaluation of a new set of two-loop master integrals, with up to three internal massive lines. In particular, three of them are expressed in terms of elliptic integrals. We verify the absence, at this perturbative order, of initial-state mass singularities proportional to a weak massive virtual correction to the quark-gluon splitting.

NNLO QCD×EW corrections to Z production in the q q channel / R. Bonciani, F. Buccioni, N. Rana, I. Triscari, A. Vicini. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 101:3(2020 Feb 28). [10.1103/PhysRevD.101.031301]

NNLO QCD×EW corrections to Z production in the q q channel

Rana N.;Triscari I.;Vicini A.
2020-02-28

Abstract

We present the first results for the O(ααs) corrections to the total partonic cross section of the process qq→Z+X, with the complete set of contributions, that include photonic and massive weak gauge boson effects. The results are relevant for the precise determination of the hadronic Z boson production cross section. Virtual and real corrections are calculated analytically using the reduction to the master integrals and their evaluation through differential equations. Real corrections are dealt with using the reverse-unitarity method. They require the evaluation of a new set of two-loop master integrals, with up to three internal massive lines. In particular, three of them are expressed in terms of elliptic integrals. We verify the absence, at this perturbative order, of initial-state mass singularities proportional to a weak massive virtual correction to the quark-gluon splitting.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
PHYSICAL REVIEW D
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/793021
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