A New Measurement of Exclusive \boldmath${\rho }^{\circ }$ Photoproduction at HERA

Abstract

Exclusive ${\rho }^{\circ }$ photoproduction has been measured with high statistics by the H1 Collaboration. The kinematical range is $20<W<90$ GeV, $|t|<3$ GeV${}^2$ and $Q^2<4$ GeV${}^2$. Cross sections are measured differentially in $W$ and $t$ and allow the extraction of the Pomeron trajectory, for the first time using ${\rho }^{\circ }$ photoproduction data of one single experiment. The preliminary result, ${\alpha }_{\mathbb{P}}(t)=1.093\pm 0.003(stat.{)}_{-0.007}^{+0.008}(syst.)+(0.116\pm 0.027(stat.{)}_{-0.046}^{+0.036}(syst.)$ GeV${}^{-2}\cdot t$, deviates significantly from the canonical expectation.

4 pages, 2 figures (requires class ws-procs9x6); Talk presented in the 14th International Workshop on Deep Inelastic Scattering, April 2006, Tsukuba, Japan; To appear in the Proceedings

References in corpus (1)

• A Fast High Resolution Track Trigger for the H1 Experiment