Reconstructing Sigma0 decays in STAR
  Typical experimental measurements do not separate the contributions of Sigma state decays from (anti)Lambda yields. An ongoing analysis in STAR is resolving the contribution from excited Sigma states, but the primary contribution comes from electromagnetic decays of the (anti)Sigma0.   Photon conversions into e+e- pairs in detector material have been used by STAR to identify photons from pi0 decays. A similar technique has been used here to identify photons from (anti)Sigma0 decays in conjunction with STAR's excellent PID capabilities for finding the associated (anti)Lambda daughters. We report here on progress toward measuring the (anti)Sigma0 yields in various nuclear collisions at RHIC. 
G. Van Buren (for the STAR Collaboration)