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Precise determination of the f(0)(600) and f(0)(980) pole parameters from a dispersive data analysis

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Garcia-Martin, R and Kamiński, Robert and Peláez Sagredo, José Ramón and Ruiz de Elvira, Jacobo (2011) Precise determination of the f(0)(600) and f(0)(980) pole parameters from a dispersive data analysis. Physical review letters, 107 (7). ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.107.072001


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Abstract

We use our latest dispersive analysis of π π scattering data and the very recent K_(l4) experimental results to obtain the mass, width, and couplings of the two lightest scalar-isoscalar resonances. These parameters are defined from their associated poles in the complex plane. The analytic continuation to the complex plane is made in a model-independent way by means of once-and twice-subtracted dispersion relations for the partial waves, without any other theoretical assumption. We find the f(0)(600) pole at [457_(-13)^(+14)] – i[279_(-7)^(+11)+ MeV and that of the f(0)(980) at (996 ± 7) – i[25_(-6)^(+10)] MeV, whereas their respective couplings to two pions are 3.59_(-0.13)^(+0.11) and 2.3 ± 0.2 GeV.


Item Type:Article
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©2011 American Physical Society.

Uncontrolled Keywords:π-π Scattering; Chiral perturbation-theory; Meson dynamics; Final-states; Phase-shift; Gamma-Ggmma; Sigma-Pple; Amplitudes; Decays; Model
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:35004
Deposited On:14 Jan 2016 16:11
Last Modified:10 Dec 2018 15:09

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