We present a new calculation for the production of isolated photon pairs at the LHC with NNLLT0′+NNLO accuracy. This is the first implementation within the Geneva Monte Carlo framework of a process with a nontrivial Born-level definition which suffers from QED singularities. Throughout the computation we use a smooth-cone isolation algorithm to remove such divergences. The higher-order resummation of the 0-jettiness resolution variable T is based on a factorisation formula derived within Soft-Collinear Effective Theory which predicts all of the singular, virtual and real NNLO corrections. Starting from this precise parton-level prediction and by employing the Geneva method, we provide fully showered and hadronised events using Pythia8, while retaining the NNLO QCD accuracy for observables which are inclusive over the additional radiation. We compare our final predictions to LHC data at 7 TeV and find good agreement.

Alioli, S., Broggio, A., Gavardi, A., Kallweit, S., Lim, M., Nagar, R., et al. (2021). Precise predictions for photon pair production matched to parton showers in GENEVA. JOURNAL OF HIGH ENERGY PHYSICS, 2021(4) [10.1007/JHEP04(2021)041].

Precise predictions for photon pair production matched to parton showers in GENEVA

Alioli S.;Broggio A.
;
Gavardi A.;Kallweit S.;Nagar R.;Napoletano D.;Rottoli L.
2021

Abstract

We present a new calculation for the production of isolated photon pairs at the LHC with NNLLT0′+NNLO accuracy. This is the first implementation within the Geneva Monte Carlo framework of a process with a nontrivial Born-level definition which suffers from QED singularities. Throughout the computation we use a smooth-cone isolation algorithm to remove such divergences. The higher-order resummation of the 0-jettiness resolution variable T is based on a factorisation formula derived within Soft-Collinear Effective Theory which predicts all of the singular, virtual and real NNLO corrections. Starting from this precise parton-level prediction and by employing the Geneva method, we provide fully showered and hadronised events using Pythia8, while retaining the NNLO QCD accuracy for observables which are inclusive over the additional radiation. We compare our final predictions to LHC data at 7 TeV and find good agreement.
Articolo in rivista - Articolo scientifico
NLO Computations;
English
6-apr-2021
2021
2021
4
41
open
Alioli, S., Broggio, A., Gavardi, A., Kallweit, S., Lim, M., Nagar, R., et al. (2021). Precise predictions for photon pair production matched to parton showers in GENEVA. JOURNAL OF HIGH ENERGY PHYSICS, 2021(4) [10.1007/JHEP04(2021)041].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/313815
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