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Title: Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia

Here, we study jets with identified hadrons in which a family of jet-shape variables called angularities are measured, extending the concept of fragmenting jet functions (FJFs) to these observables. FJFs determine the fraction of energy, z, carried by an identified hadron in a jet with angularity, τ a. The FJFs are convolutions of fragmentation functions (FFs), evolved to the jet energy scale, with perturbatively calculable matching coefficients. Renormalization group equations are used to provide resummed calculations with next-to-leading logarithm prime (NLL’) accuracy. We apply this formalism to two-jet events in e +e collisions with B mesons in the jets, and three-jet events in which a J/ψ is produced in the gluon jet. In the case of B mesons, we use a phenomenological FF extracted from e +e collisions at the Z0 pole evaluated at the scale μ = mb. For events with J/ψ, the FF can be evaluated in terms of Non-Relativistic QCD (NRQCD) matrix elements at the scale μ = 2m c. The z and τa distributions from our NLL’ calculations are compared with predictions from monte carlo event generators. While we find consistency between the predictions for B mesons and the J/ψ distributions in τa, wemore » find the z distributions for J/ψ differ significantly. We describe an attempt to merge PYTHIA showers with NRQCD FFs that gives good agreement with NLL’ calculations of the z distributions.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [1]
  1. Duke Univ., Durham, NC (United States)
  2. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-21884
Journal ID: ISSN 1029-8479
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; atomic and nuclear physics; jets
OSTI Identifier:
1338802

Bain, Reggie, Dai, Lin, Hornig, Andrew, Leibovich, Adam K., Makris, Yiannis, and Mehen, Thomas. Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia. United States: N. p., Web. doi:10.1007/JHEP06(2016)121.
Bain, Reggie, Dai, Lin, Hornig, Andrew, Leibovich, Adam K., Makris, Yiannis, & Mehen, Thomas. Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia. United States. doi:10.1007/JHEP06(2016)121.
Bain, Reggie, Dai, Lin, Hornig, Andrew, Leibovich, Adam K., Makris, Yiannis, and Mehen, Thomas. 2016. "Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia". United States. doi:10.1007/JHEP06(2016)121. https://www.osti.gov/servlets/purl/1338802.
@article{osti_1338802,
title = {Analytic and Monte Carlo studies of jets with heavy mesons and quarkonia},
author = {Bain, Reggie and Dai, Lin and Hornig, Andrew and Leibovich, Adam K. and Makris, Yiannis and Mehen, Thomas},
abstractNote = {Here, we study jets with identified hadrons in which a family of jet-shape variables called angularities are measured, extending the concept of fragmenting jet functions (FJFs) to these observables. FJFs determine the fraction of energy, z, carried by an identified hadron in a jet with angularity, τa. The FJFs are convolutions of fragmentation functions (FFs), evolved to the jet energy scale, with perturbatively calculable matching coefficients. Renormalization group equations are used to provide resummed calculations with next-to-leading logarithm prime (NLL’) accuracy. We apply this formalism to two-jet events in e+e– collisions with B mesons in the jets, and three-jet events in which a J/ψ is produced in the gluon jet. In the case of B mesons, we use a phenomenological FF extracted from e+e– collisions at the Z0 pole evaluated at the scale μ = mb. For events with J/ψ, the FF can be evaluated in terms of Non-Relativistic QCD (NRQCD) matrix elements at the scale μ = 2mc. The z and τa distributions from our NLL’ calculations are compared with predictions from monte carlo event generators. While we find consistency between the predictions for B mesons and the J/ψ distributions in τa, we find the z distributions for J/ψ differ significantly. We describe an attempt to merge PYTHIA showers with NRQCD FFs that gives good agreement with NLL’ calculations of the z distributions.},
doi = {10.1007/JHEP06(2016)121},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2016,
place = {United States},
year = {2016},
month = {6}
}