Observation of ηc(1S) and ηc(2S) decays to K+K-π+π-π0 in two-photon interactions
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Cowan-2011-in two-photon interactions.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Zhao, M.
Cowan, Ray F
Date Issued
July 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
del Amo Sanchez, P. et al. “Observation of η_{c}(1S) and η_{c}(2S) decays to K^{+}K^{-}π^{+}π^{-}π^{0} in two-photon interactions.” Physical Review D 84 (2011): n. pag. Web. 4 Nov. 2011. © 2011 American Physical Society
Version
Final published version
Abstract
We study the processes γγ→K[subscript S][superscript 0]K[superscript ±]π[superscript ∓] and γγ→K[superscript +]K[superscript -]π[superscript +]π[superscript -]π[superscript 0] using a data sample of 519.2fb[superscript -1] recorded by the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at center-of-mass energies near the Υ(nS) (n=2, 3, 4) resonances. We observe the η[subscript c](1S), χ[subscript c0](1P) and η[subscript c](2S) resonances produced in two-photon interactions and decaying to K[subscript S][superscript 0]K[superscript ±]π[superscript ∓], with significances of 18.1, 5.4 and 5.3 standard deviations (including systematic errors), respectively, and report 4.0σ evidence of the χ[subscript c2](1P) decay to this final state. We measure the η[subscript c](2S) mass and width in K[subscript S][subscript 0]K[subscript ±]π[subscript ∓] decays, and obtain the values m(η[subscript c](2S))=3638.5±1.5±0.8 MeV/c[superscript 2] and Γ(η[subscript c](2S))=13.4±4.6±3.2 MeV, where the first uncertainty is statistical and the second is systematic. We measure the two-photon width times branching fraction for the reported resonance signals, and search for the χ[subscript c2](2P) resonance, but no significant signal is observed.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.84.012004
