A New Measurement of Exclusive Ρ @bullet Photoproduction at Hera
نویسنده
چکیده
Exclusive ρ • 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 ρ • photoproduction data of one single experiment. The preliminary result, α P (t) = 1.093 ± 0.003(stat.) −0.046 (syst.)) GeV −2 · t, deviates significantly from the canonical expectation.
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