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| Titre : |
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The sigma and f_0(980) from Ke4 + pi-pi scatterings data |
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| Auteur(s) : |
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Gerard Mennessier ( )1, Stephan Narison ()1, X. -G. Wang |
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| Laboratoire : |
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| Résumé : |
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We systematically reconsider, within an improved "analytic K-matrix model", the extraction of the sigma = f_0(600) and f_0(980) masses, widths and hadronic couplings using new Ke4 = K-->pi-pi e nu_e data on pi-pi phase shift below 390 MeV and different sets of pi-pi--> pi-pi / K-K scatterings data from 400 MeV to 1.4 GeV. Our results are summarized in Tables 1, 2 and 5. In units of MeV, the complex poles are: M_sigma=452(12) - i 260(15) and M_f=981(34) -i 18(11), which are comparable with some recent high-precision determinations and with PDG values. Besides some other results, we find: |g_{sigma K+K-}|/|g_{sigma pi+pi-}|=0.37(6) which confirms a sizeable g_{sigma K+K-} coupling found earlier, and which disfavours a large pi-pi molecule or four-quark component of the sigma, while its broad pi-pi width (relative to the one of the rho-meson) cannot be explained within a \bar qq scenario. The narrow pi-pi width of the f_0(980) and the large value: |g_{f K+K-}|/|g_{f pi+pi-}|=2.59(1.34), excludes its pure (\bar uu+\bar dd) content. A significant gluonium component eventually mixed with \bar qq appears to be necessary for evading the previous difficulties. |
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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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07/02/2010 |
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| Journal : |
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| Physics Letters B (Phys. Lett. B) |
| Publisher |
Elsevier |
| ISSN |
0370-2693 |
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| Audience : |
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internationale |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Date de publication : |
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25/04/2010 |
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| Volume : |
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688 |
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| Numéro : |
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1 |
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| Page, identifiant, ... : |
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59-66 |
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| Mots Clés : |
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Meson properties – Meson–meson interactions – S-matrix – Non-perturbative calculations |
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| Référence interne : |
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LPTA:10-007 |
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