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Physics news on the Internet (based on electronic preprints)

A new particle, the exotic meson, has been detected at the National Brookhaven Laboratory's accelerator after 5 years of searching in the framework of the E852 experiment using a multiparticle spectrometer to study the reaction products of particle collisions with a liquid hydrogen target. The meson is a gluon-string-held quark-antiquark pair. While in ordinary mesons the string is in its non-oscillating ground state, exotic mesons with an oscillating string have been predicted which are now believed to have been detected. Alternatively, a ground-state 4-quark model may account for the new particle. The finding will serve as a further check on the Standard Model of elementary particles and will set the mathematical scales for future studies. An international team including Russian physicists from the Institute of High Energy Physics and Moscow State University reports the discovery. Source: http://www.pubaf.bnl.gov/