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We present an effective-Lagrangian description for forward-angle K+ Lambdaphotoproduction from the proton, valid for photon lab energies from thresholdup to 16 GeV. The high-energy part of the amplitude is modeled in terms oft-channel Regge-trajectory exchange. The sensitivity of the calculatedobservables to the Regge-trajectory phase is investigated in detail. The modelis extended towards the resonance region by adding a number of s-channelresonances to the t-channel background. The proposed hybrid``Regge-plus-resonance'' (RPR) approach allows one to exploit thep(gamma,K+)Lambda data in their entirety, resulting in stronger constraints onboth the background and resonance couplings. The high-energy data can be usedto fix the background contributions, leaving the resonance couplings as thesole free parameters in the resonance region. We compare variousimplementations of the RPR model, and explore to what extent the description ofthe data can be improved by introducing the ``new'' resonances D13(1900) andP11(1900). Despite its limited number of free parameters, the proposed RPRapproach provides an efficient description of the p(gamma,K+)Lambda dynamics inand beyond the resonance region.Comment: 31 pages, 9 figures, accepted for publication in PRC. Section IIIB  modified to include the most recent data; discussion of results and  conclusions changed accordingl

physical review. c. nuclear physics/physical review. c, nuclear physics

Forward-angle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mi>Λ</mml:mi></mml:mrow></mml:math>photoproduction in a Regge-plus-resonance approach

Forward-angleK+Λphotoproduction in a Regge-plus-resonance approach