We present the first complete calculation of mixed QCD-electroweak corrections to the production of on-shell Z bosons in hadron collisions and their decays to massless charged leptons. Our computation is fully differential with respect to final state QCD partons and resolved photons, allowing us to compute any infra-red safe observable pertinent to the pp→Z→l+l− process in the approximation that the Z boson is on shell. Although mixed QCD-electroweak corrections are small, at about the per mill level, we observe that the interplay between QCD-QED and QCD-weak contributions is subtle and observable-dependent. It is therefore not possible to avoid computing one or the other if O(αEWαs) precision is desired.

Mixed QCD-electroweak corrections to on-shell Z production at the LHC / F. Buccioni, F. Caola, M. Delto, M. Jaquier, K. Melnikov, R. Röntsch. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 811(2020 Dec 10), pp. 135969.1-135969.5. [10.1016/j.physletb.2020.135969]

Mixed QCD-electroweak corrections to on-shell Z production at the LHC

R. Röntsch
Ultimo
2020

Abstract

We present the first complete calculation of mixed QCD-electroweak corrections to the production of on-shell Z bosons in hadron collisions and their decays to massless charged leptons. Our computation is fully differential with respect to final state QCD partons and resolved photons, allowing us to compute any infra-red safe observable pertinent to the pp→Z→l+l− process in the approximation that the Z boson is on shell. Although mixed QCD-electroweak corrections are small, at about the per mill level, we observe that the interplay between QCD-QED and QCD-weak contributions is subtle and observable-dependent. It is therefore not possible to avoid computing one or the other if O(αEWαs) precision is desired.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
10-dic-2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/903719
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