Measurement of the I = 1/2 Kπ S-Wave Amplitude from Dalitz Plot Analyses of η_c → KK̅π in Two-Photon Interactions

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Measurement of the I = 1/2 Kπ S-Wave Amplitude from Dalitz Plot Analyses of η_c → KK̅π in Two-Photon Interactions

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Title: Measurement of the I = 1/2 Kπ S-Wave Amplitude from Dalitz Plot Analyses of η_c → KK̅π in Two-Photon Interactions
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Brown, D. N.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2016-01-20
Item Type: Article
Keywords: Show Keywords
Abstract: We study the processes γγ→K(S)⁰ K^± π^∓ and γγ→K⁺K⁻π⁰ using a data sample of 519 fb⁻¹ recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e⁺e⁻ collider at center-of-mass energies at and near the Υ(nS) (n=2, 3, 4) resonances. We observe η(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 KπS-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/c². In contrast, the amplitudes show very marked differences. The data require the presence of a new a₀(1950) resonance with parameters m=1931 ±14 ± 22 MeV/c² and Γ=271 ± 22 ± 29 MeV.
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.93.012005
Persistent Link: http://hdl.handle.net/10735.1/5047
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2016. "Measurement of the I=1/2 Kπ S-wave amplitude from Dalitz plot analyses of η_c → KK̅π in two-photon interactions." Physical Review D - Particles, Fields, Gravitation and Cosmology 93(1), doi:10.1103/PhysRevD.93.012005.
Terms of Use: ©2016 American Physical Society
Sponsors: The work of A. Palano and M. R. Pennington was supported (in part) by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177

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