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Precision Measurement of the Mass and Lifetime of the Xi(0)(b) Baryon

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Precision Measurement of the Mass and Lifetime of the Xi(0)(b) Baryon

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dc.contributor.author	LHCb Collaboration
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Oyanguren Campos, Arantza
dc.contributor.author	Ruiz Valls, Pablo
dc.contributor.author	Sánchez Mayordomo, Carlos
dc.date.accessioned	2016-04-19T12:16:31Z
dc.date.available	2016-04-19T12:16:31Z
dc.date.issued	2014
dc.identifier.citation	LHCb Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Ruiz Valls, Pablo Sánchez Mayordomo, Carlos 2014 Precision Measurement of the Mass and Lifetime of the Xi(0)(b) Baryon Physical Review Letters 113 3 032001-1 032001-10
dc.identifier.uri	http://hdl.handle.net/10550/52824
dc.description.abstract	Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb(-1) collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Xi(0)(b) -> Xi(+)(c)pi(-), Xi(+)(c) -> pK(-)pi(+) signal decays are reconstructed. From this sample, the first measurement of the Xi(0)(b) baryon lifetime is made, relative to that of the Lambda(0)(b) baryon. The mass differences M(Xi(0)(b)) ¿ M(Lambda(0)(b)) and M(Xi(+)(c)) ¿ M(Lambda(+)(c)) are also measured with precision more than 4 times better than the current world averages. The resulting values are tau(Xi b0)/tau(Lambda b0) = 1.006 +/- 0.018 +/- 0.010, M(Xi(0)(b)) ¿ M(Lambda(0)(b)) = 172.44 +/- 0.39 +/- 0.17 MeV/c(2), M(Xi(+)(c)) ¿ M(Lambda(+)(c)) = 181.51 +/- 0.14 +/- 0.10 MeV/c(2), where the first uncertainty is statistical and the second is systematic. The relative rate of Xi(0)(b) to Lambda(0)(b) baryon production is measured to be f(Xi b0) B(Xi(0)(b) -> Xi(+)(c)pi(-)) B(Xi(+)(c) -> pK(-)pi(+))/f(Lambda b0) B(Lambda(0)(b) -> Lambda(+)(c)pi(-)) B(Lambda(+)(c) -> pK(-)pi(+)) = (1.88 +/- 0.04 +/- 0.03) x 10(-2), where the first factor is the ratio of fragmentation fractions, b -> Xi(0)(b) relative to b -> Lambda(0)(b). Relative production rates as functions of transverse momentum and pseudorapidity are also presented.
dc.language.iso	eng
dc.relation.ispartof	Physical Review Letters, 2014, vol. 113, num. 3, p. 032001-1-032001-10
dc.subject	Física nuclear
dc.title	Precision Measurement of the Mass and Lifetime of the Xi(0)(b) Baryon
dc.type	journal article	es_ES
dc.date.updated	2016-04-19T12:16:31Z
dc.identifier.doi	10.1103/PhysRevLett.113.032001
dc.identifier.idgrec	099770
dc.rights.accessRights	open access	es_ES