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Author Mennessier, G. ♦ Narison, S. ♦ Wang, X. -G
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2010-02-07
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword High Energy Physics - Phenomenology ♦ High Energy Physics - Experiment ♦ High Energy Physics - Lattice ♦ Nuclear Theory ♦ physics:hep-ex ♦ physics:hep-lat ♦ physics:hep-ph ♦ physics:nucl-th
Abstract 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.
Description Reference: Phys.Lett.B688:59-66,2010
Educational Use Research
Learning Resource Type Article
Page Count 9


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