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