Charmonium polarization in e+e- and heavy ion collisions
Ioffe, B. L.
Original · EN
In e+e- annihilation at √s=10.6 GeV Belle Collaboration found, that J/psi mesons are predominantly produced in association with an extra cc pair. The possible mechanisms of J/psi production are discussed and the probability of the associate production of cc pair is estimated. The choice between these mechanisms can be done by measuring J/psi polarization. It is suggested, that in case of heavy ion collisions one may expect remarkable transverse polarization of produced J/psi, if quark-gluon plasma if formed. The measurement of asymmetry of e+e-(μ+μ-) angular distribution in J/psi-> e+e-(μ+μ-) decay is a useful tool for detection of quark-gluon plasma formation in heavy ion collisions.
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