e^{+}e^{} angularity distributions at NNLL' accuracy
Abstract
We present predictions for the e^{+}e^{–} event shape angularities at NNLL' resummed and O(α^{2}_{s}) matched accuracy and compare them to LEP data at centerofmass energies Q = 91.2 GeV and Q = 197 GeV. We perform the resummation within the framework of SoftCollinear Effective Theory, and make use of recent results for the twoloop angularity soft function. We determine the remaining NNLL' and O(α^{2}_{s}) ingredients from a fit to the EVENT2 generator, and implement a shape function with a renormalonfree gap parameter to model nonperturbative effects. Using values of the strong coupling α_{s}(m_{Z}) and the universal nonperturbative shift parameter Ω_{1} that are consistent with those obtained in previous fits to the thrust and Cparameter distributions, we find excellent agreement between our predictions and the LEP data for all angularities with a ϵ [–1, 0.5]. This provides a robust test of the predictions of QCD, factorization, and the universal scaling of the nonperturbative shift across different angularities. Promisingly, our results indicate that current degeneracies in the {α_{s}(m_{Z}), Ω_{1}} parameter space could be alleviated upon fitting these parameters to experimental data for the angularity distributions.
 Authors:

 Univ. Siegen, Siegen (Germany)
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Deutsches ElektronenSynchrotron (DESY), Hamburg (Germany)
 Publication Date:
 Research Org.:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org.:
 USDOE Laboratory Directed Research and Development (LDRD) Program
 OSTI Identifier:
 1525840
 Report Number(s):
 LAUR1824071
Journal ID: ISSN 10298479
 Grant/Contract Number:
 89233218CNA000001
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Journal of High Energy Physics (Online)
 Additional Journal Information:
 Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 1; Journal ID: ISSN 10298479
 Publisher:
 Springer Berlin
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Atomic, Nuclear and Particle Physics; Event shapes; quantum chromodynamics; effective field theory
Citation Formats
Bell, Guido, Hornig, Andrew, Lee, Christopher, and Talbert, Jim. e+e angularity distributions at NNLL' accuracy. United States: N. p., 2019.
Web. doi:10.1007/JHEP01(2019)147.
Bell, Guido, Hornig, Andrew, Lee, Christopher, & Talbert, Jim. e+e angularity distributions at NNLL' accuracy. United States. doi:10.1007/JHEP01(2019)147.
Bell, Guido, Hornig, Andrew, Lee, Christopher, and Talbert, Jim. Thu .
"e+e angularity distributions at NNLL' accuracy". United States. doi:10.1007/JHEP01(2019)147. https://www.osti.gov/servlets/purl/1525840.
@article{osti_1525840,
title = {e+e angularity distributions at NNLL' accuracy},
author = {Bell, Guido and Hornig, Andrew and Lee, Christopher and Talbert, Jim},
abstractNote = {We present predictions for the e+e– event shape angularities at NNLL' resummed and O(α2s) matched accuracy and compare them to LEP data at centerofmass energies Q = 91.2 GeV and Q = 197 GeV. We perform the resummation within the framework of SoftCollinear Effective Theory, and make use of recent results for the twoloop angularity soft function. We determine the remaining NNLL' and O(α2s) ingredients from a fit to the EVENT2 generator, and implement a shape function with a renormalonfree gap parameter to model nonperturbative effects. Using values of the strong coupling αs(mZ) and the universal nonperturbative shift parameter Ω1 that are consistent with those obtained in previous fits to the thrust and Cparameter distributions, we find excellent agreement between our predictions and the LEP data for all angularities with a ϵ [–1, 0.5]. This provides a robust test of the predictions of QCD, factorization, and the universal scaling of the nonperturbative shift across different angularities. Promisingly, our results indicate that current degeneracies in the {αs(mZ), Ω1} parameter space could be alleviated upon fitting these parameters to experimental data for the angularity distributions.},
doi = {10.1007/JHEP01(2019)147},
journal = {Journal of High Energy Physics (Online)},
number = 1,
volume = 2019,
place = {United States},
year = {2019},
month = {1}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: