Off-diagonal Helicity Density Matrix Elements for Vector Mesons Produced at LEP
Abstract
Final state quark-antiquark interactions may give origin to non zero values of the off-diagonal element rho1,-1 of the helicity density matrix of vector mesons produced in e+e- annihilations, as confirmed by recent OPAL data on phi and D*'s. Predictions are given for rho1,-1 of several mesons produced at large z and small pT, i.e. collinear with the parent jet; the values obtained for phi and D* are in agreement with data.
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