Top-quark loop corrections in Z+jet and Z + 2 jet production

Campbell, John M.; Ellis, R. Keith

doi:10.1007/jhep01(2017)020

Top-quark loop corrections in Z+jet and Z + 2 jet production

Campbell, John M.; Ellis, R. Keith

Authors

John M. Campbell

Professor Keith Ellis keith.ellis@durham.ac.uk
Emeritus Professor

Abstract

The sophistication of current predictions for Z+jet production at hadron colliders necessitates a re-evaluation of any approximations inherent in the theoretical calculations. In this paper we address one such issue, the inclusion of mass effects in top-quark loops. We ameliorate an existing calculation of Z + 1 jet and Z + 2 jet production by presenting exact analytic formulae for amplitudes containing top-quark loops that enter at next-to-leading order in QCD. Although approximations based on an expansion in powers of 1/mt2 can lead to poor high-energy behavior, an exact treatment of top-quark loops demonstrates that their effect is small and has limited phenomenological interest.

Citation

Campbell, J. M., & Ellis, R. K. (2017). Top-quark loop corrections in Z+jet and Z + 2 jet production. Journal of High Energy Physics, 2017(01), Article 020. https://doi.org/10.1007/jhep01%282017%29020

Journal Article Type	Article
Acceptance Date	Dec 22, 2016
Online Publication Date	Jan 5, 2017
Publication Date	Jan 5, 2017
Deposit Date	Jul 7, 2017
Publicly Available Date	Jul 7, 2017
Journal	Journal of High Energy Physics
Print ISSN	1126-6708
Publisher	Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed	Peer Reviewed
Volume	2017
Issue	01
Article Number	020
DOI	https://doi.org/10.1007/jhep01%282017%29020

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