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Differential cross sections and photon beam asymmetries for the gamma p ->pi+ n reaction have been measured for 0.6<cos(theta)<1 and Egamma=1.5-2.95 GeVat SPring-8/LEPS. The cross sections monotonically decrease as the photon beamenergy increases for 0.6<cos(theta)<0.9. However, the energy dependence of thecross sections for 0.9<cos(theta)<1 and Egamma=1.5-2.2 GeV (W=1.9-2.2 GeV) isdifferent, which may be due to a nucleon or Delta resonance. The present crosssections agree well with the previous cross sections measured by other groupsand show forward peaking, suggesting significant t-channel contributions inthis kinematical region. The asymmetries are found to be positive, which can beexplained by rho-exchange in the t-channel. Large positive asymmetries in thesmall |t| region, where the rho-exchange contribution becomes small, could beexplained by introducing pi-exchange interference with the s-channel.

Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV