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http://hdl.handle.net/2445/131199
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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 | 2019-04-02T10:26:05Z | - |
dc.date.available | 2019-04-02T10:26:05Z | - |
dc.date.issued | 2014-12-24 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131199 | - |
dc.description.abstract | We use ( 121 ± 1 ) million Υ ( 3 S ) and ( 98 ± 1 ) million Υ ( 2 S ) mesons recorded by the BABAR detector at the PEP-II e + e − collider at SLAC to perform a study of radiative transitions involving the χ b J ( 1 P , 2 P ) states in exclusive decays with μ + μ − γ γ final states. We reconstruct twelve channels in four cascades using two complementary methods. In the first we identify both signal photon candidates in the electromagnetic calorimeter (EMC), employ a calorimeter timing-based technique to reduce backgrounds, and determine branching-ratio products and fine mass splittings. These results include the best observational significance yet for the χ b 0 ( 2 P ) → γ Υ ( 2 S ) and χ b 0 ( 1 P ) → γ Υ ( 1 S ) transitions. In the second method, we identify one photon candidate in the EMC and one which has converted into an e + e − pair due to interaction with detector material, and we measure absolute product branching fractions. This method is particularly useful for measuring Υ ( 3 S ) → γ χ b 1 , 2 ( 1 P ) decays. Additionally, we provide the most up-to-date derived branching fractions, matrix elements and mass splittings for χ b transitions in the bottomonium system. Using a new technique, we also measure the two lowest-order spin-dependent coefficients in the nonrelativistic QCD Hamiltonian. | - |
dc.format.extent | 20 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.90.112010 | - |
dc.relation.ispartof | Physical Review D, 2014, vol. 90, num. 11, p. 112010 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.90.112010 | - |
dc.rights | (c) American Physical Society, 2014 | - |
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 | Bottomonium spectroscopy and radiative transitions involving the χbJ(1P,2P) states at BABAR | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 646447 | - |
dc.date.updated | 2019-04-02T10:26:06Z | - |
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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646447.pdf | 858.12 kB | Adobe PDF | View/Open |
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