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Particle physicists discover new meson Physicists may have discovered the first "hybrid meson" at the KEK laboratory in Japan. The meson, first predicted over 25 years ago, appears to contain a gluon in addition to the quark and antiquark that are usually found in mesons (S-K Choi et al. 2005 Phys. Rev. Lett. 94 182002). The new meson is currently known as the Y(3940) because it has a mass of 3940 MeV/c2.
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