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A new narrow state
The Babar collaboration has observed a narrow state decaying to D_s pi^0 at a mass
of 2.32 GeV
(hep-ex/0304021).
It appears hard to interpret this state as a meson, see
Simple heavy-quark arguments: Eichten-Hill-Quigg,
PRL 71,
4116 (1993)
Lattice mass estimates: Di Pierro & Eichten,
hep-ph/0104208.
Chris Quigg talked about possible exotic QCD explanations, see
Hybrid mesons: Barnes-Close-de Viron,
NP B224, 241 (1983)
Four-quark states: Jaffe, PRD 15, 267, 281 (1977)
Short course on color-spin in Chris Quigg's 1981 Les Houches
lecture notes, pp. 747-751.
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