New Measurement Of Exclusive Rho Degrees Photoproduction At Hera

Exclusive rho degrees photoproduction has been measured with high statistics by the HI Collaboration. The kinematical range is 20 < W < 90 GeV, vertical bar t vertical bar < 3 GeV2 and Q(2) < 4 GeV2. Cross sections are measured differentially in W and t and allow the extraction of the Pomeron trajectory, for the first time using rho degrees photoproduction data of one single experiment. The preliminary result, alpha(P) (t) 1.093 +/- 0.003(stat.)(-0.007)(+0.008) (syst.) + (0.1.16 +/- 0.027(stat.)(-0.046)(+0.036) (syst.)) GeV-2.t, deviates significantly from the canonical expectation.