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[en] This is a brief account of the recent developments on the determination of the mass and widths of the much debated scalar mesons, paying particular attention to the causes of major revision of the σ or f0(500) meson in the last edition of the Review of Particle Physics, which has finally acknowledged that the situation concerning the mass and width of this controversial state has been settled, although this was already well-known to scalar meson practitioners for about a decade. I will briefly comment on the dispersive approach, followed by several groups, which seems to have been the most decisive in support of the existence and precise determinations of scalar meson properties
[en] There are strong arguments favoring a four-quark interpretation of sub-GeV light scalar mesons and the diquark-antidiquark body-plan of the tetraquark seems to provide the most convincing picture. The building diquarks of these particles are assumed to be spin zero objects. In this Letter we explore the possibility that radially excited aggregations of spin zero or spin one diquarks might exist and discuss the possibility of the Y(2175) state observed by BaBar and confirmed by BES being one such state
[en] I will briefly review in this talk the most significant developments in light scalars spectroscopy that have occurred since the last edition of this Conference, although I will comment on the updates of the mass and width of different light scalar mesons in the latest edition of the Particle Data Tables, I will be mostly focusing on the major revision of the f_0(500) meson, also known as σ meson. I will explain how this major update has been driven both by new data and rigorous dispersive analysis. (author)
[en] First, recent work on light scalar mesons, which is of possible interest in connectionwith the strong coupling region of QCD, is briefly discussed. Then a very shorthighlighting of a paper concerned with an application to the eta --> 3pi problem ispresented.
[en] The author studies the radiative decay mode of the ω-meson into a hypothetical light scalar boson χ. The author obtains that the rate for this decay is extremely small. The author proposes the theoretical project for the Crystal Barrel Collaboration to detect the χ-boson
[en] In a model-independent approach the data on ππ → ππ, K , ηη, ηη′ in the I G J PC = 0+0++ channel and on the Kπ scattering in the channel are analyzed jointly for studying the status and QCD nature of the f 0- and the K*0-mesons. It is shown that in the 1500-MeV region, there are two states, wide (interpreted as a glueball) and narrow (q ). In the Kπ-scattering data analysis, the proof for the K*0(900) is given.
[en] We consider the decays of the scalar (J/sup P/ = 0+) mesons and the pseudovector A1 (J/sup P/ = 1+) meson in the nonlocal quark model. We investigate the hypotheses of these mesons being two- or four-quark states. The present experimental data favor two-quark states