Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR
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Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR

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Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR

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dc.contributor.author BABAR Collaboration
dc.contributor.author Martínez Vidal, Fernando
dc.contributor.author Oyanguren Campos, Arantza
dc.contributor.author Villanueva Pérez, Pablo
dc.date.accessioned 2016-04-20T09:46:51Z
dc.date.available 2016-04-20T09:46:51Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10550/52871
dc.description.abstract We use (121 +/- 1) million Upsilon(3S) and (98 +/- 1) million Upsilon(2S) mesons recorded by the BABAR detector at the PEP-II e(+)e(-) collider at SLAC to perform a study of radiative transitions involving the chi(bJ)(1P, 2P) states in exclusive decays with mu(+)mu(-)gamma gamma 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 chi(b0)(2P) -> gamma Upsilon(2S) and chi(b0)(1P) -> gamma Upsilon(1S) 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 Upsilon(3S) -> gamma chi(b1,2)(1P) decays. Additionally, we provide the most up-to-date derived branching fractions, matrix elements and mass splittings for chi(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.language.iso eng
dc.relation.ispartof Physical Review D, 2014, vol. 90, num. 11, p. 112010-1-112010-20
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source BABAR Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Villanueva Pérez, Pablo 2014 Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR Physical Review D 90 11 112010-1 112010-20
dc.subject Física nuclear
dc.title Bottomonium spectroscopy and radiative transitions involving the chi(bJ)(1P, 2P) states at BABAR
dc.type info:eu-repo/semantics/article
dc.date.updated 2016-04-20T09:46:51Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.90.112010
dc.identifier.idgrec 102026

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