arXiv:hep-ph/9704420·v1·High Energy Physics — Phenomenology
Off-diagonal Helicity Density Matrix Elements for Vector Mesons Produced at LEP
Mauro Anselmino (1) · Marc Bertini (1,2) · Francesco Murgia (3) · Paulo Quintairos (1,4) ((1) University and INFN, Torino, Italy, (2) IPN, Lyon, France, (3) INFN, Cagliari, Italy, (4) CBPF, Rio de Janeiro, Brazil)
Abstract
Final state quark-antiquark interactions 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, as confirmed by recent OPAL data on phi and D^*'s. Predictions are given for rho_{1,-1} of several mesons produced at large z and small p_T, i.e. collinear with the parent jet; the values obtained for phi and D^* are in agreement with data.
Comments: LaTeX, 12 pages, no figures