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B* production in Z decays

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B* production in Z decays

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dc.contributor.author	DELPHI Collaboration
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	2014-04-30T08:00:51Z
dc.date.available	2014-04-30T08:00:51Z
dc.date.issued	1995
dc.identifier.citation	DELPHI Collaboration 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 1995 B* production in Z decays Zeitschrift für Physik C-Particles and Fields 68 353 362
dc.identifier.uri	http://hdl.handle.net/10550/34784
dc.description.abstract	The decay B* -t B¡ has been observed with the DELPHI detector at LEP, where the B* mesan is produced in Z boson decays. The combination of inclusively reconstructed B mesons with well-measured converted photons yields a measurement of the flavour-averaged B* - B mass difference of 45.5 ± 0.3 (stat.) ± 0.8 (syst.) Me V /c2 95% confidence leve! upper limits at 6 Me V /c2 are placed on both the isospin (i.e. B+ -Bº) and the B.-Bud splitting of the mass difference. The production ratio of B* to B mesons in Z decays is measured to be 0.72 ± 0.03 (stat.) ±0.06 (syst.). Limits on the production cross-section of other hypothetical excited B hadron states decaying radiatively are established. The differential B* cross section has been measured to be in good agreement with the average b fragmentation, yielding an average fractional B* energy of (xE) =0.695 ± 0.009 (stat.) ± 0.013 (syst.) . From the decay angular distribution the relative contribution of longitudinal B* polarisation states is measured to be <7L/(<7L + 17T) = 0.32 ± 0.04 (stat.) ±0.03 (syst.).
dc.relation.ispartof	Zeitschrift für Physik C-Particles and Fields, 1995, vol. 68, p. 353-362
dc.subject	Física nuclear
dc.title	B* production in Z decays
dc.type	journal article	es_ES
dc.date.updated	2014-04-30T08:00:51Z
dc.identifier.doi	10.1007/BF01620711
dc.identifier.idgrec	006577
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1007/BF01620711