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Photo of Andrew Lifson

Andrew Lifson

Doctoral student

Photo of Andrew Lifson

Calculating the primary Lund Jet Plane density

Author

  • Andrew Lifson
  • Gavin P. Salam
  • Grégory Soyez

Summary, in English

The Lund-jet plane has recently been proposed as a powerful jet substructure tool with a broad range of applications. In this paper, we provide an all-order single logarithmic calculation of the primary Lund-plane density in Quantum Chromodynamics, including contributions from the running of the coupling, collinear effects for the leading parton, and soft logarithms that account for large-angle and clustering effects. We also identify a new source of clustering logarithms close to the boundary of the jet, deferring their resummation to future work. We then match our all-order results to exact next-to-leading order predictions. For phenomenological applications, we supplement our perturbative calculation with a Monte Carlo estimate of non-perturbative corrections. The precision of our final predictions for the Lund-plane density is 5−7% at high transverse momenta, worsening to about 20% at the lower edge of the perturbative region, corresponding to transverse momenta of about 5 GeV. We compare our results to a recent measurement by the ATLAS collaboration at the Large-Hadron Collider, revealing good agreement across the perturbative domain, i.e. down to about 5 GeV.

Department/s

  • Theoretical Particle Physics

Publishing year

2020

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2020

Issue

10

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Jets
  • QCD Phenomenology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479