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

Journal Article · · Journal of High Energy Physics (Online)
 [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)

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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1525840
Report Number(s):
LA-UR--18-24071
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2019; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Two-loop anomalous dimensions of generic dijet soft functions text January 2018
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FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1 journal June 2019
FCC Physics Opportunities text January 2019

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