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

1998/10/02 by M. Anselmino, M. Bertini, Anselmino, M. +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9810226

3 pages, LaTeX, no figures, uses sprocl.sty. Talk delivered by F. Murgia at the XIII International Symposium on High Energy Spin Physics (SPIN98), September 8-12, 1998, Protvino, Russia

arxiv created 1998/10/02 · arxiv updated 2009/11/30

Abstract

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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