Scaling violations of quark and gluon jet fragmentation functions in e+e- annihilations at sqrt(s) = 91.2 and 183-209 GeV

Abstract

Flavour inclusive, udsc and b fragmentation functions in unbiased jets, and flavour inclusive, udsc, b and gluon fragmentation functions in biased jets are measured in e+e- annihilations from data collected at centre-of-mass energies of 91.2, and 183-209 GeV with the OPAL detector at LEP. The unbiased jets are defined by hemispheres of inclusive hadronic events, while the biased jet measurements are based on three-jet events selected with jet algorithms. Several methods are employed to extract the fragmentation functions over a wide range of scales. Possible biases are studied in the results are obtained. The fragmentation functions are compared to results from lower energy e+e- experiments and with earlier LEP measurements and are found to be consistent. Scaling violations are observed and are found to be stronger for the fragmentation functions of gluon jets than for those of quarks. The measured fragmentation functions are compared to three recent theoretical next-to-leading order calculations and to the predictions of three Monte Carlo event generators. While the Monte Carlo models are in good agreement with the data, the theoretical predictions fail to describe the full set of results, in particular the b and gluon jet measurements.

46 pages, 17 figures, Submitted to Eur. Phys J. C

References in corpus (3)

• Search for Nearly Mass-Degenerate Charginos and Neutralinos at LEP
• Experimental studies of unbiased gluon jets from e+e- annihilations using the jet boost algorithm
• A Measurement of Semileptonic B Decays to Narrow Orbitally-Excited Charm Mesons

Cited by in corpus (22)

• Jet substructure as a new Higgs search channel at the LHC
• Measurement of Collins asymmetries in inclusive production of charged pion pairs in e^+e^- annihilation at BABAR
• Discovering baryon-number violating neutralino decays at the LHC
• Measurement of the charged-particle multiplicity inside jets from $\sqrt{s}=8$ TeV $pp$ collisions with the ATLAS detector
• Jet Structure from Dihadron Correlations in d+Au collisions at sqrt(s_NN) = 200 GeV
• Improving the Simulation of Quark and Gluon Jets with Herwig 7
• Extrapolating parton fragmentation to low $Q^2$ in $e^{+}$-$e^{-}$ collisions
• Properties of jet fragmentation using charged particles measured with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Are minimal conditions for collectivity met in e+e- collisions?
• Gluon- and Quark-Jet Multiplicities with NNNLO and NNLL Accuracy
• (medium-modified) Fragmentation Functions
• Unbinned Deep Learning Jet Substructure Measurement in High $Q^2$ ep collisions at HERA
• Average gluon and quark jet multiplicities at higher orders
• Leading jets and energy loss
• Comparison of Particle Production in Quark and Gluon Fragmentation at sqrt s ~ 10 GeV
• Antenna subtraction at NNLO with identified hadrons
• Test of Colour Reconnection Models using Three-Jet Events in Hadronic Z Decays
• Charged Particle Multiplicity in Three-Jet Events and Two-Gluon Systems
• Jet Fragmentation Function Moments in Heavy Ion Collisions
• Measurements of jet cross-section ratios in 13 TeV proton--proton collisions with ATLAS
• The Multiplicity Scaling of the Fragmentation Function
• Latest QCD results from LEP