Reviews of topical problems

Exotic mesons

State Research Center Institute ofHigh Energy Physics, ul. Pobedy 1, Protvino, Moscow Region, 142280, Russian Federation

A review is given of the current state of searches for, and investigations of, exotic mesonic states in hadronic reactions, $J/\psi$ decays, and $\gamma$, $\gamma$ collisions. These experiments have led in recent years to the discovery of a number of mesonic states whose properties do not fit into the simple quark model of ``ordinary'' ($\mathrm{q\bar q}$) mesons. The new particles appear to be very serious candidates for exotic hadrons. The current state of the E/iota problem and the nature of the E(1420) meson are discussed.

PACS: 13.25.Gv, 14.40.Cs, 13.40.Hq, 13.75.Gx, 12.38.−t (all)
DOI: 10.1070/PU1990v033n03ABEH002551
Citation: Landsberg L G "Exotic mesons" Sov. Phys. Usp. 33 (3) 169–203 (1990)
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:    « » 160 (3) 1–56 (1990); DOI: 10.3367/UFNr.0160.199003a.0001

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