Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-06-26
Progress in High Energy Physics, Vol. 3 (2009)
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 2 figures, to appear in the proceedings of the XVII International Workshop on Deep Inelastic Scattering and Related S
Scientific paper
10.3360/dis.2009.165
Based on data on elastic $\rho^0$ photoproduction from the H1, Omega and ZEUS collaborations, a fit has been performed to extract the value $\alpha_P (t)$ of the pomeron trajectory at fixed values of t from the W dependence of the differential $\gamma p$ cross section $d \sigma_{\gamma p} (W) / d t$. The data used in the fit cover the range of $8.3 \le W \le 94 GeV$ in $\gamma p$ centre-of-mass energy and $0.01 \le |t| \le 0.95 GeV^2$ in momentum transfer. A linear fit to the resulting values of $\alpha_P (t)$ yields $\alpha_{P,0} =1.0871 \pm 0.0026 (stat.) \pm 0.0030 (syst.)$ for the intercept and $\alpha'_P = 0.126 \pm 0.013 (stat.) \pm 0.012 (syst.) GeV^{-2}$ for the slope of the pomeron trajectory. The data are also compatible with the Donnachie-Landshoff trajectory $\alpha_P (t) = 1.0808 + 0.25 GeV^{-2}\cdot t$ at low values $|t| \lesssim 0.3 GeV^2$ and with a constant value of $\alpha_P (t)$ at larger values of $|t|$.
for the H1 Collaboration
List Benno
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