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Title: The asymptotic form of non-global logarithms, black disc saturation, and gluonic deserts

Journal Article · · Journal of High Energy Physics (Online)
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, we develop an asymptotic perturbation theory for the large logarithmic behavior of the non-linear integro-differential equation describing the soft correlations of QCD jet measurements, the Banfi-Marchesini-Smye (BMS) equation. Furthermore, this equation captures the late-time evolution of radiating color dipoles after a hard collision. This allows us to prove that at large values of the control variable (the non-global logarithm, a function of the infra-red energy scales associated with distinct hard jets in an event), the distribution has a gaussian tail. We also compute the decay width analytically, giving a closed form expression, and find it to be jet geometry independent, up to the number of legs of the dipole in the active jet. By enabling the asymptotic expansion we find that the perturbative seed is correct; we perturb around an anzats encoding formally no real emissions, an intuition motivated by the buffer region found in jet dynamics. This must be supplemented with the correct application of the BFKL approximation to the BMS equation in collinear limits. Comparing to the asymptotics of the conformally related evolution equation encountered in small-x physics, the Balitisky-Kovchegov (BK) equation, we find that the asymptotic form of the non-global logarithms directly maps to the black-disc unitarity limit of the BK equation, despite the contrasting physical pictures. Indeed, we recover the equations of saturation physics in the final state dynamics of QCD.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1360709
Report Number(s):
LA-UR--16-27653
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2017; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Resumming double non-global logarithms in the evolution of a jet journal February 2018
NLL′ resummation of jet mass journal April 2019
The groomed and ungroomed jet mass distribution for inclusive jet production at the LHC journal October 2018
The transverse momentum distribution of hadrons within jets journal November 2017
Resummation of boson-jet correlation at hadron colliders journal November 2019
Phenomenology of single-inclusive jet production with jet radius and threshold resummation journal March 2018
NLL′ resummation of jet mass text January 2019

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