Evidence for the h[subscript b](1P) meson in the decay Υ(3S)→π[superscript 0]h[subscript b](1P)
Name
Lees-2011-Evidence for the hb.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Cowan, Ray F
Date Issued
November 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
J. P. Lees et al. "Evidence for the h[subscript b](1P) meson in the decay Υ(3S)→π[superscript 0]h[subscript b](1P)" Physical Review D 84, 091101(R)(2011). © 2011 American Physical Society
Version
Final published version
Abstract
Using a sample of 122×10[superscript 6] Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at SLAC, we search for the h[subscript b](1P) spin-singlet partner of the P-wave χ[subscript bJ](1P) states in the sequential decay Υ(3S)→π[superscript 0]h[subscript b](1P), h[subscript b](1P)→γη[subscript b](1S). We observe an excess of events above background in the distribution of the recoil mass against the π[superscript 0] at mass 9902±4(stat)±2(syst) MeV/c[superscript 2]. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10[superscript -4] for the product branching fraction B(Υ(3S)→π[superscript 0]h[subscript b])×B(h[subscript b]→γη[subscript b]).
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.84.091101
