Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
The note includes plots presented in the vector meson discussion session of the Workshop of Low-x Physics (june 1999), Tel-Avi
Scientific paper
A compilation of H1 and ZEUS cross section measurements for elastic vector meson production is presented as a function of the scale $K^2 = (Q^2+M_V^2)/4$, where Q^2 is the exchanged photon virtuality and M_V is the mass of the vector meson. The ratio of longitudinal to transverse cross sections R = $\sigma_L/\sigma_T$ is presented as a function of Q^2/M^2_V. The cross sections are separated in a transverse and a longitudinal component, and are presented as a function of K^2. The intercept $\alpha(0)$ -- 1 governing the energy dependence of the vector meson cross sections is compared with the $\lambda$ parameter measured in inclusive F_2 analysis. For $\rho$ meson production, the helicity amplitude ratios $|T_{ij}|/|T_{00}|$, extracted from the H1 and ZEUS measurements of the spin density matrix elements are presented as a function of Q^2 and W and are compared to recent predictions.
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