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Title: e+e- angularity distributions at NNLL' accuracy

Abstract

We present predictions for the e+e event shape angularities at NNLL' resummed and O2s) matched accuracy and compare them to LEP data at center-of-mass energies Q = 91.2 GeV and Q = 197 GeV. We perform the resummation within the framework of Soft-Collinear Effective Theory, and make use of recent results for the two-loop angularity soft function. We determine the remaining NNLL' and O2s) ingredients from a fit to the EVENT2 generator, and implement a shape function with a renormalon-free gap parameter to model non-perturbative effects. Using values of the strong coupling αs(mZ) and the universal non-perturbative shift parameter Ω1 that are consistent with those obtained in previous fits to the thrust and C-parameter 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 non-perturbative 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.

Authors:
 [1];  [2]; ORCiD logo [2];  [3]
  1. Univ. Siegen, Siegen (Germany)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Deutsches Elektronen-Synchrotron (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):
LA-UR-18-24071
Journal ID: ISSN 1029-8479
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 1029-8479
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 center-of-mass energies Q = 91.2 GeV and Q = 197 GeV. We perform the resummation within the framework of Soft-Collinear Effective Theory, and make use of recent results for the two-loop 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 renormalon-free gap parameter to model non-perturbative effects. Using values of the strong coupling αs(mZ) and the universal non-perturbative shift parameter Ω1 that are consistent with those obtained in previous fits to the thrust and C-parameter 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 non-perturbative 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}
}

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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: Angularity distributions at NNLL′ +$\mathcal{O}$($α ^{2}_{s}$) accuracy, convolved with a renormalon-free non-perturbative shape function, whose calculation is the subject of this paper. We display the predictions for three values of $a$ (for now without uncertainties), illustrating roughly where two-jet and three-or-more-jet events lie in each $τ$$a$ spectrum. Formore » this illustration, the boundary is drawn at the value of $τ$$a$ for a four-particle state that is grouped into pairs of jets with opening angle 30° . As $a$ becomes larger (smaller), the peak region is more (less) dominated by purely two-jet events.« less

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    Works referencing / citing this record:

    $\mathrm{e^+ e^−}$ angularity distributions at NNLL′ accuracy
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    • Bell, Guido; Hornig, Andrew; Lee, Christopher
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