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http://hdl.handle.net/2445/131736
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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 | 2019-04-08T09:55:03Z | - |
dc.date.available | 2019-04-08T09:55:03Z | - |
dc.date.issued | 2010-10-11 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131736 | - |
dc.description.abstract | We report results from an updated study of the suppressed decays B − → D K − and B − → D ∗ K − followed by D → K + π − , where D ( * ) indicates a D ( * ) 0 or a ¯¯¯ D ( * ) 0 meson, and D ∗ → D π 0 or D ∗ → D γ . These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ due to interference between the b → c transition B − → D ( * ) 0 K − followed by the doubly Cabibbo-suppressed decay D 0 → K + π − , and the b → u transition B − → ¯¯¯ D ( * ) 0 K − followed by the Cabibbo-favored decay ¯¯¯ D 0 → K + π − . We also report an analysis of the decay B − → D ( * ) π − with the D decaying into the doubly Cabibbo-suppressed mode D → K + π − . Our results are based on 467 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at SLAC. We measure the ratios R ( * ) of the suppressed ( [ K + π − ] D K − / π − ) to favored ( [ K − π + ] D K − / π − ) branching fractions as well as the C P asymmetries A ( * ) of those modes. We see indications of signals for the B − → D K − and B − → D ∗ D π 0 K − suppressed modes, with statistical significances of 2.1 and 2.2 σ , respectively, and we measure: R D K = ( 1.1 ± 0.6 ± 0.2 ) × 10 − 2 , A D K = − 0.86 ± 0.47 + 0.12 − 0.16 , R ∗ ( D π 0 ) K = ( 1.8 ± 0.9 ± 0.4 ) × 10 − 2 , A ∗ ( D π 0 ) K = + 0.77 ± 0.35 ± 0.12 , R ∗ ( D γ ) K = ( 1.3 ± 1.4 ± 0.8 ) × 10 − 2 , A ∗ ( D γ ) K = + 0.36 ± 0.94 + 0.25 − 0.41 , where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio r B ≡ | A ( B − → ¯¯¯ D 0 K − ) / A ( B − → D 0 K − ) | = ( 9.5 + 5.1 − 4.1 ) % , with r B < 16.7 % at 90% confidence level. In the case of B − → D ∗ K − we find r ∗ B ≡ | A ( B − → ¯¯¯ D * 0 K − ) / A ( B − → D * 0 K − ) | = ( 9.6 + 3.5 − 5.1 ) % , with r ∗ B < 15.0 % at 90% confidence level. | - |
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.82.072006 | - |
dc.relation.ispartof | Physical Review D, 2010, vol. 82, num. 7, p. 072006 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.82.072006 | - |
dc.rights | (c) American Physical Society, 2010 | - |
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 | Search for b→u transitions in B−→DK− and D∗K− decays | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 601952 | - |
dc.date.updated | 2019-04-08T09:55:03Z | - |
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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601952.pdf | 1.3 MB | Adobe PDF | View/Open |
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