Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of ${\alpha }_s$

Abstract

The subjet multiplicity has been measured in neutral current e+p interactions at Q**2 > 125 GeV**2 with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. Jets were identified in the laboratory frame using the longitudinally invariant K_T cluster algorithm. The number of jet-like substructures within jets, known as the subjet multiplicity, is defined as the number of clusters resolved in a jet by reapplying the jet algorithm at a smaller resolution scale y_cut. Measurements of the mean subjet multiplicity, < n_sbj >, for jets with transverse energies E_T,jet >15 GeV are presented. Next-to-leading-order perturbative QCD calculations describe the measurements well. The value of alpha_s(M_Z), determined from < n_sbj > at y_cut=10**-2 for jets with 25 < E_T,jet < 71 GeV, is alpha_s (M_Z) = 0.1187 +/- 0.0017 (stat.) +0.0024 / -0.0009 (syst.) +0.0093 / -0.0076 (th.).

arXiv comment27 pages, 4 figures, 3 tables; submitted to Phys. Lett

References in corpus (23)

• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• A General Algorithm for Calculating Jet Cross Sections in NLO QCD
• Successive Combination Jet Algorithm For Hadron Collisions
• Improved Parton Distributions from Global Analysis of Recent Deep Inelastic Scattering and Inclusive Jet Data
• Deep-Inelastic Inclusive ep Scattering at Low x and a Determination of alpha_s
• Measurement of the neutral current cross section and F2 structure function for deep inelastic e+p scattering at HERA
• LEPTO 6.5 - A Monte Carlo Generator for Deep Inelastic Lepton-Nucleon Scattering
• Measurement and QCD Analysis of Jet Cross Sections in Deep-Inelastic Positron-Proton Collisions at sqrt(s) of 300 GeV
• Neural Network based Electron Identification in the ZEUS Calorimeter
• Inclusive jet cross sections in the Breit frame in neutral current deep inelastic scattering at HERA and determination of alpha_s
• Dijet photoproduction at HERA and the structure of the photon
• Measurement of High-Q^2 Neutral-Current e^+p Deep Inelastic Scattering Cross-Sections at HERA
• Measurement of Internal Jet Structure in Dijet Production in Deep-Inelastic Scattering at HERA
• Measurement of multiplicity and momentum spectra in the current and target regions of the Breit frame in Deep Inelastic Scattering at HERA
• Measurement of dijet production in neutral current deep inelastic scattering at high Q**2 and determination of alpha_s
• Measurement of ${\alpha }_S$ from Jet Rates in Deep Inelastic Scattering at HERA
• High-mass dijet cross sections in photoproduction at HERA
• Subjet Rates in Hadron Collider Jets
• Subjet Multiplicity of Gluon and Quark Jets Reconstructed with the $k_{\perp }$ Algorithm in $p\bar{p}$ Collisions
• Measurement of Jet Shapes in High-Q**2 Deep Inelastic Scattering at HERA
• The Subjet Multiplicity in Quark and Gluon Jets
• Multi-Jet Event Rates in Deep Inelastic Scattering and Determination of the Strong Coupling Constant
• Differential (2+1) Jet Event Rates and Determination of alpha_s in Deep Inelastic Scattering at HERA

Cited by in corpus (24)

• Boosted objects: a probe of beyond the Standard Model physics
• Jet mass and substructure of inclusive jets in sqrt(s) = 7 TeV pp collisions with the ATLAS experiment
• An NLO QCD analysis of inclusive cross-section and jet-production data from the ZEUS experiment
• The Hadronic Final State at HERA
• Inclusive-jet and dijet cross sections in deep inelastic scattering at HERA
• Collider Physics at HERA
• Measurement of jet substructure observables in $\mathrm{t}\overline{\mathrm{t}}$ events from proton-proton collisions at $\sqrt{s}=$ 13TeV
• Inclusive-jet photoproduction at HERA and determination of alphas
• Induced gravity with a non-minimally coupled scalar field on the brane
• QCD uncertainties at the LHC and the implications of HERA
• Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA
• Inclusive-jet cross sections in NC DIS at HERA and a comparison of the kT, anti-kT and SIScone jet algorithms
• Substructure dependence of jet cross sections at HERA and determination of alphas
• Multijet production in neutral current deep inelastic scattering at HERA and determination of alpha_s
• Jet production in charged current deep inelastic e+p scattering at HERA
• Measurement of kT splitting scales in W->lv events at sqrt(s)=7 TeV with the ATLAS detector
• Unbinned Deep Learning Jet Substructure Measurement in High $Q^2$ ep collisions at HERA
• Isolated tau leptons in events with large missing transverse momentum at HERA
• Multi-jet cross sections in charged current e+-p scattering at HERA
• Subjet distributions in deep inelastic scattering at HERA
• Production of Z0 bosons in elastic and quasi-elastic ep collisions at HERA
• Jet substructure in neutral current deep inelastic e+p scattering at upcoming Electron-Ion Collider
• Jet substructure at HERA
• Jets in Deep Inelastic Scattering and High Energy Photoproduction at HERA