LHC spots particle that may be new form of matter - physics-math - 10 April 2014 - New Scientist: Now that Z(4430)'s existence is confirmed, the next challenge is to work out whether it really is a tetraquark.
There is at least one reason why physicists can be hopeful. The other suspected tetraquarks might simply be loosely bound pairs of mesons, says Marek Karliner, a theorist at Tel Aviv University in Israel, who was not part of the team. Z(4430) is different because its mass does not seem to allow for this.
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