arXiv:hep-ph/9805234·v2·High Energy Physics — Phenomenology
Off-diagonal helicity density matrix elements for heavy vector mesons inclusively produced in N-N, gamma-N, l-N interactions
M. Anselmino (1)🇮🇹 · M. Bertini (1 and 2)🇮🇹 · F. Murgia (3)🇮🇹 · B. Pire (4) ((1) University and INFN, Torino, Italy, (2) IPN, Lyon, France, (3) University and INFN, Cagliari, Italy, (4) CPhT, Ecole Polytechnique, France)🇫🇷
Abstract
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 V produced in current jets, with a large energy fraction x_E; the value of rho_(1,-1)(V) is related to the hard constituent dynamics and tests unusual properties of it. Some recent data on phi, K^* and D^* produced in e^+ e^- annihilations at LEP show such effects. Predictions are given here for rho_(1,-1) of heavy mesons produced in nucleon-nucleon, gamma-nucleon and lepton-nucleon interactions.
Comments: LaTeX, 10 pages, 1 postscript figure, uses epsfig.sty. Revised version, to be published on Phys. Lett. B. Some statements added to clarify text