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http://hdl.handle.net/2445/132435
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DC Field | Value | Language |
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dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-04-26T11:34:53Z | - |
dc.date.available | 2019-04-26T11:34:53Z | - |
dc.date.issued | 2018-12-26 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/2445/132435 | - |
dc.description.abstract | We present first evidence that the cosine of the C P -violating weak phase 2 β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B 0 → D ( * ) h 0 with D → K 0 S π + π − decays, where h 0 ∈ { π 0 , η , ω } denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the Υ ( 4 S ) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain ( 471 ± 3 ) × 10 6 B ¯ B pairs recorded by the BABAR detector and ( 772 ± 11 ) × 10 6 B ¯ B pairs recorded by the Belle detector. The results of the measurement are sin 2 β = 0.80 ± 0.14 ( stat ) ± 0.06 ( syst ) ± 0.03 ( model ) and cos 2 β = 0.91 ± 0.22 ( stat ) ± 0.09 ( syst ) ± 0.07 ( model ) . The result for the direct measurement of the angle β of the CKM Unitarity Triangle is β = [ 22.5 ± 4.4 ( stat ) ± 1.2 ( syst ) ± 0.6 ( model ) ] ° . The measurement assumes no direct C P violation in B 0 → D ( * ) h 0 decays. The quoted model uncertainties are due to the composition of the D 0 → K 0 S π + π − decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e + e − → c ¯ c data sample. C P violation is observed in B 0 → D ( * ) h 0 decays at the level of 5.1 standard deviations. The significance for cos 2 β > 0 is 3.7 standard deviations. The trigonometric multifold solution π / 2 − β = ( 68.1 ± 0.7 ) ° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. | - |
dc.format.extent | 11 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/PhysRevLett.121.261801 | - |
dc.relation.ispartof | Physical Review Letters, 2018, vol. 121, num. 26, p. 261801 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevLett.121.261801 | - |
dc.rights | (c) American Physical Society, 2018 | - |
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 | First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 684821 | - |
dc.date.updated | 2019-04-26T11:34:53Z | - |
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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684821.pdf | 781.57 kB | Adobe PDF | View/Open |
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