The discovery of some baryon-antibaryon resonances has led us to consider 3q 3 " q systems as possible candidates. We predict their spectrum in the framework of a constituent model, where the chromomagnetic interaction plays the main role. The relevant parameters are fixed by the present knowledge of tetraquarks. The emerging scenario complies well with experiment; besides the description of the baryonantibaryon resonances, we find evidence for new tetraquark states, namely, the a 0 ðYÞ in the hidden strangeness sector and the Yð4140Þ and Xð4350Þ in the cscs sector. A detailed account of the spectra and the decay channels is provided for future comparisons with data.
The BRST anomaly which may be present in the induced $W_n$ gravity quantized
on the light-cone is evaluated in the geometrical framework of Zucchini. The
cocycles linked by the cohomology of the BRST operator to the anomaly are
straightforwardly calculated thanks to the analogy between this formulation and
the Yang-Mills theory. We give also a conformally covariant formulation of
these quantities including the anomaly, which is valid on arbitrary Riemann
surfaces. The example of the $W_3$ theory is discussed and a comparison with
other candidates for the anomaly available in the literature is presented.Comment: Latex, no figures, 12 pages (To appear on Physics Letters B.
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