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.)(-0.0009)(+0.0024)(syst.)(-0.0076)(+0.0093)(th.). (C) 2003 Published by Elsevier Science B.V.

Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of alpha(s) / S., C., D., K., J. H., L., S., M., B., M., J., R., R., Y., M. C., K., P., A., G., B., A., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., A., C., M., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 558:(2003), pp. 41-58. [10.1016/S0370-2693(03)00216-8]

Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of alpha(s)

D'AGOSTINI, Giulio;NIGRO, Andrea;
2003

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, , 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 at y(cut) = 10(-2) for jets with 25 < E(T,jet) < 71 GeV, is alpha(s) (M(Z)) = 0.1187 +/- 0.0017(stat.)(-0.0009)(+0.0024)(syst.)(-0.0076)(+0.0093)(th.). (C) 2003 Published by Elsevier Science B.V.
2003
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of alpha(s) / S., C., D., K., J. H., L., S., M., B., M., J., R., R., Y., M. C., K., P., A., G., B., A., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., A., C., M., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 558:(2003), pp. 41-58. [10.1016/S0370-2693(03)00216-8]
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/394023
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 41
  • ???jsp.display-item.citation.isi??? 39
social impact