On the mass, width and coupling constants of the f 0 (980)
| Autor: | R. Escribano, A. Gallegos, J.L. Lucio M., G. Moreno, J. Pestieau |
|---|---|
| Přispěvatelé: | UCL - SC/PHYS - Département de physique |
| Rok vydání: | 2003 |
| Předmět: |
Coupling constant
Physics Particle physics Physics and Astronomy (miscellaneous) Unitarity FOS: Physical sciences High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology Formalism (philosophy of mathematics) High Energy Physics - Phenomenology (hep-ph) Pi High Energy Physics::Experiment Invariant mass Engineering (miscellaneous) |
| Zdroj: | European Physical Journal C. Particles and Fields, Vol. C28, p. 107-114 (2003) |
| ISSN: | 1434-6052 1434-6044 |
| DOI: | 10.1140/epjc/s2003-01140-6 |
| Popis: | Using the pole approach we determine the mass and width of the $f_0(980)$; in particular, we analyze the possibility that two nearby poles are associated to it. We restrict our analysis to a neighborhood of the resonance, using $\pi\pi$ data for the phase shift and inelasticity, and the invariant mass spectrum of the $J/\psi\to\phi\pi\pi, \phi K\bar K$ decays. The formalism we use is based on unitarity and a generalized version of the Breit-Wigner parameterization. We find that a single pole describes the $f_0(980)$, the precise position depending upon the $\pi\pi$ data used. As a byproduct, values for the $g_{f_0\pi\pi}$ and $g_{f_0K\bar K}$ coupling constants are obtained. Comment: 18 pages, 2 figures. A new analysis including the latest pi-pi phase shift data is performed. To be published in Eur. Phys. J. C |
| Databáze: | OpenAIRE |
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