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Bottomonium spectroscopy and radiative transitions involving the χ b J (1P,2P) states at B a B ar

Lees, J. P.
•
Poireau, V.
•
Tisserand, V.
altro
Wu, S. L.
2014
  • journal article

Periodico
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
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-γγfinal 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.
DOI
10.1103/PhysRevD.90.112010
WOS
WOS:000348871500002
Archivio
http://hdl.handle.net/11368/2836158
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84919907684
http://www.scopus.com/inward/record.url?eid=2-s2.0-84919907684&partnerID=40&md5=f795040cc5f7db947c5260a266ca085f
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metadata only access
Soggetti
  • Nuclear and High Ener...

Web of Science© citazioni
6
Data di acquisizione
Mar 28, 2024
Visualizzazioni
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Data di acquisizione
Apr 19, 2024
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