1 research outputs found
Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production
As confirmed by some recent LEP data on phi, K^* and D^*0 production, 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 produced in e^+ e^- annihilations: we give estimates for rho_{1,-1} of
vector mesons with a large x_E and collinear with the parent jet, relating its
size and sign to the associated hard constituent dynamics. We mention possible
non-zero values of rho_{1,-1} in several other processes