{
  "id": "hep-ex/0212030",
  "version": "v1",
  "published": "2002-12-12T15:57:16.000Z",
  "updated": "2002-12-12T15:57:16.000Z",
  "title": "Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of $α_s$",
  "authors": [
    "ZEUS Collaboration"
  ],
  "comment": "27 pages, 4 figures, 3 tables; submitted to Phys. Lett",
  "journal": "Phys.Lett.B558:41-58,2003",
  "doi": "10.1016/S0370-2693(03)00216-8",
  "categories": [
    "hep-ex"
  ],
  "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.).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-12-12T15:57:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "neutral current deep inelastic scattering",
      "measurement",
      "determination",
      "next-to-leading-order perturbative qcd calculations",
      "mean subjet multiplicity"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 604485
    }
  }
}