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Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays

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Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Alemany Fernández, Reyes
dc.contributor.author	Cabrera Urbán, Susana
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Costa Mezquita, María José
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gil Botella, Inés
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Oyanguren Campos, Arantza
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Tortosa Martínez, Pablo
dc.date.accessioned	2014-04-01T11:00:01Z
dc.date.available	2014-04-01T11:00:01Z
dc.date.issued	2001
dc.identifier.citation	DELPHI Collaboration Castillo Giménez, María Victoria Ferrer Soria, Antonio Higón Rodríguez, Emilio 2001 Measurement of the semileptonemic b branching fractions and average b mixing parameter in Z decays European Physical Journal C 20 3 455 478
dc.identifier.uri	http://hdl.handle.net/10550/33927
dc.description.abstract	The semileptonic branching fractions for primary and cascade b decays {BR}(brightarrow ell^-), BR(brightarrow crightarrow ell^+) and BR(brightarrowbar crightarrow ell^- were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays. By fitting the momentum spectra of di-leptons in opposite jets, the average b mixing parameter bar{χ} was also extracted. The following results have been obtained: begin{eqnarray} BR({brightarrow ell^- ell^-}) &=& (10.70±0.08 (stat)±0.21(syst)_{+0.44}^{-0.30}(model))% BR({brightarrow crightarrow ell^+})&=& (7.98±0.22 (stat)±0.21(syst)^{+0.14}_{-0.20}(model))% BR({brightarrow bar c rightarrow ell^-})&=& (1.61±0.20 (stat)±0.17(syst)^{+0.30}_{-0.44}(model))% bar{χ} &=& 0.127±0.013 (stat)±0.005(syst)±0.004(model) end{eqnarray}
dc.relation.ispartof	European Physical Journal C, 2001, vol. 20, num. 3, p. 455-478
dc.subject	Física nuclear
dc.subject	Partícules (Física nuclear)
dc.title	Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays
dc.type	journal article	es_ES
dc.date.updated	2014-04-01T11:00:01Z
dc.identifier.doi	10.1007/s100520100690
dc.identifier.idgrec	006739
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1007/s100520100690