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Title: Measurement of the I=1/2 Kπ S-wave amplitude from Dalitz plot analyses of ηc→KK¯π in two-photon interactions
Author: Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Interaccions d'hadrons
Hadron interactions
Issue Date: 20-Jan-2016
Publisher: American Physical Society
Abstract: 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 .
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2016, vol. 93, num. 1, p. 012005-1-012005-16
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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