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Measurement of the B -> X(s)l(+)l(-) Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States

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Measurement of the B -> X(s)l(+)l(-) Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States

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dc.contributor.author BABAR Collaboration
dc.contributor.author Martínez Vidal, Fernando
dc.contributor.author Oyanguren Campos, Arantza
dc.contributor.author Villanueva Pérez, Pablo
dc.date.accessioned 2016-04-19T12:11:27Z
dc.date.available 2016-04-19T12:11:27Z
dc.date.issued 2014
dc.identifier.citation BABAR Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Villanueva Pérez, Pablo 2014 Measurement of the B -> X(s)l(+)l(-) Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States Physical Review Letters 112 21 211802-1 211802-8
dc.identifier.uri http://hdl.handle.net/10550/52820
dc.description.abstract We measure the total branching fraction of the flavor-changing neutral-current process B -> X(s)l(+)l(-), along with partial branching fractions in bins of dilepton and hadronic system (X-s) mass, using a sample of 471 x 10(6)Upsilon(4S) -> B (B) over bar events recorded with the BABAR detector. The admixture of charged and neutral B mesons produced at PEP-II2 are reconstructed by combining a dilepton pair with 10 different X-s final states. Extrapolating from a sum over these exclusive modes, we measure a lepton-flavor-averaged inclusive branching fraction B(B -> X(s)l(+)l(-)) = [6.73(-0.64)(+0.70)(stat)(-0.25)(+0.34)(exp syst) +/- 0.50(model syst)] x 10(-6) for m(l+l-)(2) > 0.1 GeV2/c(4). Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry A(CP) in bins of dilepton mass; over the full dilepton mass range, we find A(CP) = 0.04 +/- 0.11 +/- 0.01 for a leptonflavor-averaged sample.
dc.language.iso eng
dc.relation.ispartof Physical Review Letters, 2014, vol. 112, num. 21, p. 211802-1-211802-8
dc.subject Física nuclear
dc.title Measurement of the B -> X(s)l(+)l(-) Branching Fraction and Search for Direct CP Violation from a Sum of Exclusive Final States
dc.type journal article es_ES
dc.date.updated 2016-04-19T12:11:28Z
dc.identifier.doi 10.1103/PhysRevLett.112.211802
dc.identifier.idgrec 099494
dc.rights.accessRights open access es_ES

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