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Article Dans Une Revue Journal of High Energy Physics Année : 2023

Lund multiplicity in QCD jets

Rok Medves
  • Fonction : Auteur
Alba Soto-Ontoso
  • Fonction : Auteur

Résumé

We compute the average Lund multiplicity of high-energy QCD jets. This extends an earlier calculation, done for event-wide multiplicity in $e^+e^-$ collisions [arxiv:2205.02861], to the large energy range available at the LHC. Our calculation achieves next-to-next-to-double logarithmic (NNDL) accuracy. Our results are split into a universal collinear piece, common to the $e^+e^-$ calculation, and a non-universal large-angle contribution. The latter amounts to 10-15% of the total multiplicity. We provide accurate LHC predictions by matching our resummed calculation to fixed-order NLO results and by incorporating non-perturbative corrections via Monte Carlo simulations. Including NNDL terms leads to a 50% reduction of the theoretical uncertainty, with non-perturbative corrections remaining below 5% down to transverse momentum scales of a few GeV. This proves the suitability of Lund multiplicities for robust theory-to-data comparisons at the LHC.

Dates et versions

hal-03921030 , version 1 (03-01-2023)

Identifiants

Citer

Rok Medves, Alba Soto-Ontoso, Gregory Soyez. Lund multiplicity in QCD jets. Journal of High Energy Physics, 2023, 04, pp.104. ⟨10.1007/JHEP04(2023)104⟩. ⟨hal-03921030⟩
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