Journal article
Bottomonium spectroscopy and radiative transitions involving the chi_bJ(1P,2P) states at BABAR
Physical review. D, Particles, fields, gravitation, and cosmology, Vol.90(11), 112010
10/14/2014
DOI: 10.1103/PhysRevD.90.112010
Abstract
We use (121±1) million Υ(3S) and (98±1) million Υ(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 χbJ(1P,2P) states in exclusive decays with μ+μ−γγ 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 χb0(2P)→γΥ(2S) and χb0(1P)→γΥ(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 Υ(3S)→γχb1,2(1P) decays. Additionally, we provide the most up-to-date derived branching fractions, matrix elements and mass splittings for χb transitions in the bottomonium system. Using a new technique, we also measure the two lowest-order spin-dependent coefficients in the nonrelativistic QCD Hamiltonian.
Details
- Title: Subtitle
- Bottomonium spectroscopy and radiative transitions involving the chi_bJ(1P,2P) states at BABAR
- Creators
- J. P Lees - University of SavoyBaBar Collaboration
- Contributors
- U Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physical review. D, Particles, fields, gravitation, and cosmology, Vol.90(11), 112010
- DOI
- 10.1103/PhysRevD.90.112010
- ISSN
- 1550-7998
- eISSN
- 1550-2368
- Publisher
- American Physical Society
- Grant note
- DOI: 10.13039/100000015, name: U.S. Department of Energy; DOI: 10.13039/100000001, name: National Science Foundation; DOI: 10.13039/501100000038, name: Natural Sciences and Engineering Research Council of Canada; DOI: 10.13039/501100001659, name: Deutsche Forschungsgemeinschaft; DOI: 10.13039/501100004007, name: Istituto Nazionale di Fisica Nucleare; DOI: 10.13039/501100001712, name: Stichting voor Fundamenteel Onderzoek der Materie; DOI: 10.13039/501100003443, name: Ministry of Education and Science of the Russian Federation; DOI: 10.13039/501100000271, name: Science and Technology Facilities Council; DOI: 10.13039/501100001742, name: United States-Israel Binational Science Foundation; name: Commissariat à l’Energie Atomique; name: Institut National de Physique Nucléaire et de Physique des Particules; name: Bundesministerium für Bildung und Forschung; DOI: 10.13039/501100005416, name: Research Council of Norway; name: Ministerio de Economía y Competitividad; name: Marie-Curie IEF; name: A. P. Sloan Foundation
- Language
- English
- Date published
- 10/14/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984200034602771
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