Nonglobal correlations in collider physics
Name
PhysRevD.93.014012.pdf
Size
731.34 KB
Format
Adobe PDF
Checksum (MD5)
395bffe6c2a73468ef6b0f90df74988c
Author(s)
Larkoski, Andrew J.
Moult, Ian James
Date Issued
January 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Larkoski, Andrew J., and Ian Moult. "Nonglobal correlations in collider physics." Phys. Rev. D 93, 014012 (January 2016). © 2016 American Physical Society
Version
Final published version
Abstract
Despite their importance for precision QCD calculations, correlations between in- and out-of-jet regions of phase space have never directly been observed. These so-called nonglobal effects are present generically whenever a collider physics measurement is not explicitly dependent on radiation throughout the entire phase space. In this paper, we introduce a novel procedure based on mutual information, which allows us to isolate these nonglobal correlations between measurements made in different regions of phase space. We study this procedure both analytically and in Monte Carlo simulations in the context of observables measured on hadronic final states produced in e[superscript +]e[superscript -] collisions, though it is more widely applicable. The procedure exploits the sensitivity of soft radiation at large angles to nonglobal correlations, and we calculate these correlations through next-to-leading logarithmic accuracy. The bulk of these nonglobal correlations are found to be described in Monte Carlo simulation. They increase by the inclusion of nonperturbative effects, which we show can be incorporated in our calculation through the use of a model shape function. This procedure illuminates the source of nonglobal correlations and has connections more broadly to fundamental quantities in quantum field theory.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.014012
