arXiv:hep-ph/9904205·v1·High Energy Physics — Phenomenology
Off-diagonal helicity density matrix elements for vector mesons produced in polarized e+e- processes
M. Anselmino (1)🇮🇹 · M. Bertini (2)🇸🇪 · F. Caruso (3)🇧🇷 · F. Murgia (4)🇮🇹 · P. Quintairos (5) ((1) University and INFN, Torino, Italy, (2) Lund University, Sweden, (3) CBPF and UERJ, Rio de Janeiro, Brazil, (4) INFN and University, Cagliari, Italy, (5) UNESP, Sao Paulo, Brazil)🇧🇷
Abstract
Final state quark-antiquark interactions 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, D^* and K^*'s. New predictions are given for rho_{1,-1} of several mesons produced at large x_E and small p_T -- i.e. collinear with the parent jet -- in the annihilation of polarized e+ and e-; the results depend strongly on the elementary dynamics and allow further non trivial tests of the Standard Model.
Comments: LaTeX, 20 pages, 6 ps figures, uses epsfig.sty