Calculating the primary Lund Jet Plane density

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.

• Author: Andrew Lifson; Gavin P. Salam; Grégory Soyez
• Department/s: Theoretical Particle Physics - Has been reorganised
• Publishing year: 2020
• Language: English
• Publication/Series: Journal of High Energy Physics
• Volume: 2020
• Issue: 10
• Links: http://dx.doi.org/10.1007/JHEP10(2020)170
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics
• Keywords: Jets; QCD Phenomenology
• Status: Published
• ISBN/ISSN/Other: ISSN: 1029-8479