We study the resummation of the 0-jettiness resolution variable T0 for the top-quark pair production process in hadronic collisions. Starting from an effective theory framework we derive a factorisation formula for this observable which allows its resummation at any logarithmic order in the T0 → 0 limit. We then calculate the O(αs) corrections to the soft function matrices and, by employing renormalisation group equation methods, we obtain the ingredients for the resummation formula up to next-to-next-to-leading logarithmic (NNLL) accuracy. We study the impact of these corrections to the 0-jettiness distribution by comparing predictions at different accuracy orders: NLL, NLL′, NNLL and approximate NNLL′ (NNLLa′). We match these results to the corresponding fixed order calculations both at leading order and next-to-leading order for the tt¯ +jet production process, obtaining the most accurate prediction of the 0-jettiness distribution for the top-quark pair production process at NNLLa′+NLO accuracy.

Alioli, S., Broggio, A., Lim, M. (2022). Zero-jettiness resummation for top-quark pair production at the LHC. JOURNAL OF HIGH ENERGY PHYSICS, 2022(1) [10.1007/JHEP01(2022)066].

Zero-jettiness resummation for top-quark pair production at the LHC

Alioli S.;Broggio A.;
2022

Abstract

We study the resummation of the 0-jettiness resolution variable T0 for the top-quark pair production process in hadronic collisions. Starting from an effective theory framework we derive a factorisation formula for this observable which allows its resummation at any logarithmic order in the T0 → 0 limit. We then calculate the O(αs) corrections to the soft function matrices and, by employing renormalisation group equation methods, we obtain the ingredients for the resummation formula up to next-to-next-to-leading logarithmic (NNLL) accuracy. We study the impact of these corrections to the 0-jettiness distribution by comparing predictions at different accuracy orders: NLL, NLL′, NNLL and approximate NNLL′ (NNLLa′). We match these results to the corresponding fixed order calculations both at leading order and next-to-leading order for the tt¯ +jet production process, obtaining the most accurate prediction of the 0-jettiness distribution for the top-quark pair production process at NNLLa′+NLO accuracy.
Articolo in rivista - Articolo scientifico
NLO Computations; QCD Phenomenology
English
Alioli, S., Broggio, A., Lim, M. (2022). Zero-jettiness resummation for top-quark pair production at the LHC. JOURNAL OF HIGH ENERGY PHYSICS, 2022(1) [10.1007/JHEP01(2022)066].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/354985
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