Measurement of the I = 1/2 Kπ S-wave amplitude from Dalitz plot analyses of η[subscript c] → K[bar over K]π in two-photon interactions
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PhysRevD.93.012005.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Brown, D. N.
Kolomensky, Yu. G.
Koch, H.
Schroeder, T.
Date Issued
January 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., et al. "Measurement of the I = 1/2 Kπ S-wave amplitude from Dalitz plot analyses of η[subscript c] → K[bar over K]π in two-photon interactions." Phys. Rev. D 93, 012005 (January 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We study the processes γγ → K[0 over S]K[superscript ±]π[superscript ∓] and γγ → K[superscript +]K[superscript -]π[superscript 0] using a data sample of 519 fb[superscript -1] recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at center-of-mass energies at and near the Υ(nS) (n = 2, 3, 4) resonances. We observe η[subscript c] decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I = 1/2 Kπ S-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5 GeV/c[superscript 2]. In contrast, the amplitudes show very marked differences. The data require the presence of a new a[subscript 0](1950) resonance with parameters m = 1931 ± 14 ± 22 MeV/c[superscript 2] and Γ = 271 ± 22 ± 29 MeV.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.012005
