Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/131393
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-04-04T11:45:58Z | - |
dc.date.available | 2019-04-04T11:45:58Z | - |
dc.date.issued | 2006-05-05 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131393 | - |
dc.description.abstract | We present measurements of the flavor-changing neutral current decays B → K ℓ + ℓ − and B → K ∗ ℓ + ℓ − , where ℓ + ℓ − is either an e + e − or μ + μ − pair. The data sample comprises 229 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at the PEP-II e + e − storage ring. Flavor-changing neutral current decays are highly suppressed in the standard model and their predicted properties could be significantly modified by new physics at the electroweak scale. We measure the branching fractions B ( B → K ℓ + ℓ − ) = ( 0.34 ± 0.07 ± 0.02 ) × 10 − 6 , B ( B → K ∗ ℓ + ℓ − ) = ( 0.78 + 0.19 − 0.17 ± 0.11 ) × 10 − 6 , the direct C P asymmetries of these decays, and the relative abundances of decays to electrons and muons. For two regions in ℓ + ℓ − mass, above and below m J / ψ , we measure partial branching fractions and the forward-backward angular asymmetry of the lepton pair. In these same regions we also measure the K ∗ longitudinal polarization in B → K ∗ ℓ + ℓ − decays. Upper limits are obtained for the lepton-flavor-violating decays B → K e μ and B → K ∗ e μ . All measurements are consistent with standard model expectations. | - |
dc.format.extent | 18 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.73.092001 | - |
dc.relation.ispartof | Physical Review D, 2006, vol. 73, num. 9, p. 092001 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.73.092001 | - |
dc.rights | (c) American Physical Society, 2006 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B → Kℓ+ℓ− and B → K∗ℓ+ℓ− | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 542585 | - |
dc.date.updated | 2019-04-04T11:45:58Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
542585.pdf | 715.75 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.