Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production

Details Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production

1998-10-02

arxiv.org/abs/hep-ph/9810226v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, LaTeX, no figures, uses sprocl.sty. Talk delivered by F. Murgia at the XIII International Symposium on High Energy Sp

Scientific paper

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.

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