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http://hdl.handle.net/2445/131560
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DC Field | Value | Language |
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dc.contributor.author | Garra Ticó, Jordi | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-04-05T11:07:33Z | - |
dc.date.available | 2019-04-05T11:07:33Z | - |
dc.date.issued | 2008-02-15 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131560 | - |
dc.description.abstract | We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element | V c b | and of the parameters ρ 2 , R 1 ( 1 ) , and R 2 ( 1 ) , which fully characterize the form factors for the B 0 → D * − ℓ + ν ℓ decay in the framework of heavy-quark effective field theory. The results, based on a selected sample of about 52 800 B 0 → D * − ℓ + ν ℓ decays, recorded by the BABAR detector, are ρ 2 = 1.157 ± 0.094 ± 0.027 , R 1 ( 1 ) = 1.327 ± 0.131 ± 0.043 , R 2 ( 1 ) = 0.859 ± 0.077 ± 0.021 , and F ( 1 ) | V c b | = ( 34.7 ± 0.4 ± 1.0 ) × 10 − 3 . The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BABAR measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, ρ 2 = 1.191 ± 0.048 ± 0.028 , R 1 ( 1 ) = 1.429 ± 0.061 ± 0.044 , R 2 ( 1 ) = 0.827 ± 0.038 ± 0.022 , and F ( 1 ) | V c b | = ( 34.4 ± 0.3 ± 1.1 ) × 10 − 3 . Using lattice calculations for the axial form factor F ( 1 ) , we extract | V c b | = ( 37.4 ± 0.3 ± 1.2 ± 1.2 1.4 ) × 10 − 3 , where the third error is due to the uncertainty in F ( 1 ) . We also present a measurement of the exclusive branching fraction, B = ( 4.69 ± 0.04 ± 0.34 ) % . | - |
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.77.032002 | - |
dc.relation.ispartof | Physical Review D, 2008, vol. 77, num. 3, p. 032002 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.77.032002 | - |
dc.rights | (c) American Physical Society, 2008 | - |
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 | Determination of the form factors for the decay B0→D*−l+νl and of the CKM matrix element |Vcb| | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 577719 | - |
dc.date.updated | 2019-04-05T11:07:33Z | - |
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 | |
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577719.pdf | 1.89 MB | Adobe PDF | View/Open |
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