Bottomonium spectroscopy and radiative transitions involving the χ[subscript bJ](1P,2P) states at BaBar
Name
PhysRevD.90.112010.pdf
Size
858.12 KB
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Checksum (MD5)
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
December 2014
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., et al. "Bottomonium spectroscopy and radiative transitions involving the χ[subuscript bJ](1P,2P) states at BaBar." Phys. Rev. D 90, 112010 (December 2014). © 2014 American Physical Society
Version
Final published version
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[superscript +]e[superscript -] collider at SLAC to perform a study of radiative transitions involving the χ[subscript bJ](1P,2P) states in exclusive decays with μ[superscript +]μ[superscript -]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 χ[subscript b0](2P) → γΥ(2S) and χ[subscript b0](1P) → γΥ(1S) transitions. In the second method, we identify one photon candidate in the EMC and one which has converted into an e[superscript +]e[superscript -] pair due to interaction with detector material, and we measure absolute product branching fractions. This method is particularly useful for measuring Υ(3S) → γχ[subscript b1,2](1P) decays. Additionally, we provide the most up-to-date derived branching fractions, matrix elements and mass splittings for χ[subscript 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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.90.112010
