Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production
High Energy Physics - Phenomenology
2007-05-23 v1
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.
Keywords
Cite
@article{arxiv.hep-ph/9810226,
title = {Quark fragmentation and off-diagonal helicity density matrix elements for vector meson production},
author = {M. Anselmino and M. Bertini and F. Murgia and P. Quintairos},
journal= {arXiv preprint arXiv:hep-ph/9810226},
year = {2007}
}
Comments
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