Differential cross section and recoil polarization measurements for the γpK+Λ reaction using CLAS at Jefferson Lab

Phys. Rev. C 81, 025201 – Published 11 February 2010
M. E. McCracken et al. (CLAS Collaboration)

Abstract

We present measurements of the differential cross section and Λ recoil polarization for the γpK+Λ reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+pπ- and K+p (missing π-) final-state topologies; results from these analyses were found to exhibit good agreement. These differential-cross-section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300-MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500-MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of nonresonant K+Λ photoproduction mechanisms at all production angles.

DOI: http://dx.doi.org/10.1103/PhysRevC.81.025201

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  • Received 21 December 2009
  • Published 11 February 2010

© 2010 The American Physical Society

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