Off-diagonal helicity density matrix elements for heavy vector mesons inclusively produced in N-N, gamma-N, l-N interactions
Abstract
Final state interactions in quark fragmentation may give origin to non zero values of the off-diagonal element rho(1,-1) of the helicity density matrix of vector mesons V produced in current jets, with a large energy fraction xE; the value of rho(1,-1)(V) is related to the hard constituent dynamics and tests unusual properties of it. Some recent data on phi, K* and D* produced in e+ e- annihilations at LEP show such effects. Predictions are given here for rho(1,-1) of heavy mesons produced in nucleon-nucleon, gamma-nucleon and lepton-nucleon interactions.
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