We study a simplified model of top production and decay, consisting in a virtual vector boson W* decaying into a massive-massless t-b¯ quark-antiquark pair. The top has a finite width and further decays into a stable vector boson W and a b quark. We then consider the emission or the virtual exchange of one gluon, with all possible light-quark loop insertions. These are the dominant diagrams in the limit of an infinite number of light flavours. We devise a procedure to compute this process fully, by analytic and numerical methods, and for any infrared-safe final-state observables. We examine the results at arbitrary orders in perturbation theory, and assess the factorial growth associated with renormalons. We look for renormalon effects leading to corrections of order ΛQCD, that we dub “linear” renormalons, in the inclusive cross section (with and without selection cuts), in the mass of the reconstructed-top system, and in the average energy of the final-state W boson, considering both the pole and the M S ¯ scheme for the top mass. We find that the total cross section without cuts, if expressed in terms of the M S ¯ mass, does not exhibit linear renormalons, but, as soon as selection cuts are introduced, jets-related linear renormalons arise in any mass scheme. In addition, we show that the reconstructed mass is affected by linear renormalons in any scheme and that the average energy of the W boson (that we consider as a simplified example of leptonic observable), in any mass scheme, has a renormalon in the narrow-width limit, that is however screened at large orders for finite top widths, provided the top mass is in the M S ¯ scheme.

Ferrario Ravasio, S., Nason, P., Oleari, C. (2019). All-orders behaviour and renormalons in top-mass observables. JOURNAL OF HIGH ENERGY PHYSICS, 2019(1) [10.1007/JHEP01(2019)203].

All-orders behaviour and renormalons in top-mass observables

Ferrario Ravasio, S;Nason, P;Oleari, C
2019

Abstract

We study a simplified model of top production and decay, consisting in a virtual vector boson W* decaying into a massive-massless t-b¯ quark-antiquark pair. The top has a finite width and further decays into a stable vector boson W and a b quark. We then consider the emission or the virtual exchange of one gluon, with all possible light-quark loop insertions. These are the dominant diagrams in the limit of an infinite number of light flavours. We devise a procedure to compute this process fully, by analytic and numerical methods, and for any infrared-safe final-state observables. We examine the results at arbitrary orders in perturbation theory, and assess the factorial growth associated with renormalons. We look for renormalon effects leading to corrections of order ΛQCD, that we dub “linear” renormalons, in the inclusive cross section (with and without selection cuts), in the mass of the reconstructed-top system, and in the average energy of the final-state W boson, considering both the pole and the M S ¯ scheme for the top mass. We find that the total cross section without cuts, if expressed in terms of the M S ¯ mass, does not exhibit linear renormalons, but, as soon as selection cuts are introduced, jets-related linear renormalons arise in any mass scheme. In addition, we show that the reconstructed mass is affected by linear renormalons in any scheme and that the average energy of the W boson (that we consider as a simplified example of leptonic observable), in any mass scheme, has a renormalon in the narrow-width limit, that is however screened at large orders for finite top widths, provided the top mass is in the M S ¯ scheme.
Articolo in rivista - Articolo scientifico
Perturbative QCD; Renormalization Regularization and Renormalons; Nuclear and High Energy Physics;
English
2019
2019
1
203
open
Ferrario Ravasio, S., Nason, P., Oleari, C. (2019). All-orders behaviour and renormalons in top-mass observables. JOURNAL OF HIGH ENERGY PHYSICS, 2019(1) [10.1007/JHEP01(2019)203].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/217828
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