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Measurement of the I=1/2 Kπ S-wave amplitude from Dalitz plot analyses of ηc→KK¯π in two-photon interactions
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We study the processes γ γ → K 0 S K ± π ∓ and γ γ → K + K − π 0 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 ( n S ) ( 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 K π 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 2 . In contrast, the amplitudes show very marked differences. The data require the presence of a new a 0 ( 1950 ) resonance with parameters m = 1931 ± 14 ± 22 MeV / c 2 and Γ = 271 ± 22 ± 29 MeV .
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurement of the I=1/2 Kπ S-wave amplitude from Dalitz plot analyses of ηc→KK¯π in two-photon interactions. Physical Review D. 2016. Vol. 93, num. 1, pags. 012005-1-012005-16. ISSN 1550-7998. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/119357