Jet energy spectrum and substructure in $e^+e^-$ collisions at 91.2 GeV with ALEPH Archived Data

(2) Harvard University; (3) Rice University; (4) National Taiwan University; (5) Georgia State University; (6) CERN; (7) INFN Sezione di Bari; (8) University of Colorado); Anthony Badea (2); Austin Baty (3); Christopher McGinn (8)

Jet energy spectrum and substructure in e^+e^- collisions at 91.2 GeV with ALEPH Archived Data

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arxiv 2111.09914 v2 pith:C5D6VYFH submitted 2021-11-18 hep-ex nucl-ex

Jet energy spectrum and substructure in $e^+e^-$ collisions at 91.2 GeV with ALEPH Archived Data

Yi Chen (1) , Anthony Badea (2) , Austin Baty (3) , Paoti Chang (4) , Yang-Ting Chien (5) , Gian Michele Innocenti (6) , Marcello Maggi (7) , Christopher McGinn (8)

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Dennis V. Perepelitsa (8) Michael Peters (1) Tzu-An Sheng (1) Jesse Thaler (1) Yen-Jie Lee (1) ((1) Massachusetts Institute of Technology (2) Harvard University (3) Rice University (4) National Taiwan University (5) Georgia State University (6) CERN (7) INFN Sezione di Bari (8) University of Colorado)

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keywords energydatagroomedspectrasubstructurealepharchivedcalculations

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abstract

The first measurements of energy spectra and substructure of anti-$k_{T}$ jets in hadronic $Z^0$ decays in $e^+e^-$ collisions are presented. The archived $e^+e^-$ annihilation data at a center-of-mass energy of 91.2 GeV were collected with the ALEPH detector at LEP in 1994. In addition to inclusive jet and leading dijet energy spectra, various jet substructure observables are analyzed as a function of jet energy which includes groomed and ungroomed jet mass to jet energy ratios, groomed momentum sharing, and groomed jet radius. The results are compared with perturbative QCD calculations and predictions from the SHERPA, HERWIG v7.1.5, PYTHIA 6, PYTHIA 8, and PYQUEN event generators. The jet energy spectra agree with perturbative QCD calculations which include the treatment of logarithms of the jet radius and threshold logarithms. None of the event generators give a fully satisfactory description of the data.

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