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Energy dependence of the differences between the quark and gluon jet fragmentation

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Energy dependence of the differences between the quark and gluon jet fragmentation

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Alemany Fernández, Reyes
dc.contributor.author	Cabrera Urbán, Susana
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Navas Concha, Sergio
dc.contributor.author	Salt Cairols, José
dc.date.accessioned	2014-04-01T08:18:03Z
dc.date.available	2014-04-01T08:18:03Z
dc.date.issued	1996
dc.identifier.citation	DELPHI Collaboration Alemany, R. Cabrera Urbán, Susana Castillo Giménez, María Victoria Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Hernández Rey, Juan José Higón Rodríguez, Emilio Lacasta Llácer, Carlos Martínez Vidal, Fernando Martí García, Salvador Navas, S. Salt Cairols, José 1996 Energy dependence of the differences between the quark and gluon jet fragmentation Zeitschrift für Physik C-Particles and Fields 70 2 179 195
dc.identifier.uri	http://hdl.handle.net/10550/33903
dc.description.abstract	Three jet events arising from decays of the Z boson, collected by the DELPHI detector, were used to measure differences in quark and gluon fragmentation. Gluon jets were anti-tagged by identifying b quark jets. Unbiased quark jets came from events with two jets plus one photon. Quark and gluon jet properties in different energy ranges were compared for the first time within the same detector. Quark and gluon jets of nearly the same energy in symmetric three jet event topologies were also compared. Using three independent methods, the average value of the ratio of the mean charged multiplicities of gluon and quark jets is <r>=1.241±0.015 (stat.)±0.025 (syst.). Gluon jets are broader and produce fragments with a softer energy spectrum than quark jets of equivalent energy. The string effect has been observed in fully symmetric three jet events. The measured ratio R_{\gamma} of the charged particle flow in the q\overline{q} inter-jet region of the q\bar{q}g and q\bar{q}\gamma samples agrees with the perturbative QCD expectation. The dependence of the mean charged multiplicity on the hadronic center-of-mass energy was analysed in photon plus n-jet events. The value for \alpha_s(M_Z) determined from these data using a QCD prediction with corrections at leading and next-to-leading order is αs(MZ)=0.116±0.003 (stat.)±0.009 (syst.).
dc.relation.ispartof	Zeitschrift für Physik C-Particles and Fields, 1996, vol. 70, num. 2, p. 179-195
dc.subject	Física nuclear
dc.subject	Partícules (Física nuclear)
dc.title	Energy dependence of the differences between the quark and gluon jet fragmentation
dc.type	journal article	es_ES
dc.date.updated	2014-04-01T08:18:03Z
dc.identifier.doi	10.1007/s002880050095
dc.identifier.idgrec	006592
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1007/s002880050095