Journal article
Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of αs
Physics letters. B, Vol.558(1-2), pp.41-58
04/10/2003
DOI: 10.1016/S0370-2693(03)00216-8
Abstract
The subjet multiplicity has been measured in neutral current e+p interactions at Q2>125 GeV2 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 kT 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 ycut. Measurements of the mean subjet multiplicity, 〈nsbj〉, for jets with transverse energies ET,jet>15 GeV are presented. Next-to-leading-order perturbative QCD calculations describe the measurements well. The value of αs(MZ), determined from 〈nsbj〉 at ycut=10−2 for jets with 25<ET,jet<71 GeV, is αs(MZ)=0.1187±0.0017(stat.)+0.0024−0.0009(syst.)+0.0093−0.0076(th.).
Details
- Title: Subtitle
- Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of αs
- Creators
- ZEUS CollaborationJ. Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.558(1-2), pp.41-58
- Publisher
- Elsevier B.V
- DOI
- 10.1016/S0370-2693(03)00216-8
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Language
- English
- Date published
- 04/10/2003
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627284702771
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