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

• Published in: The journal of high energy physics 2022-06, Vol.2022 (6), p.8-24, Article 8
• Main Authors: Chen, Yi, Badea, Anthony, Baty, Austin, Chang, Paoti, Chien, Yang-Ting, Innocenti, Gian Michele, Maggi, Marcello, McGinn, Christopher, Perepelitsa, Dennis V., Peters, Michael, Sheng, Tzu-An, Thaler, Jesse, Lee, Yen-Jie
• Format: Article
• Language: English
• Subjects: Algorithms; Atoms & subatomic particles; Charged particles; Classical and Quantum Gravitation; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Collisions; Datasets; e +-e − Experiments; e+-e− experiments; Elementary Particles; Energy; Energy spectra; Generators; High energy physics; Jet Physics; Jet substructure; Jets; Logarithms; Mathematical analysis; Physics; Physics and Astronomy; QCD; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Radiation; Regular Article - Experimental Physics; Relativity Theory; Sensors; String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP06(2022)008

A bstract 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 S herpa , H erwig v7.1.5, P ythia 6, P ythia 8 and P yquen 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.