Speaker
Denis Veretennikov
Description
The beam-spin induced polarization of Λ and anti-Λ hyperons produced in deep-inelastic scattering of longitudinally polarized positrons from unpolarized nucleons has been investigated by the HERMES experiment at a positron beam energy of 27.6 GeV. Here, preliminary results are reported from data taken in the years
1999 to 2007, including in particular the two high-luminosity periods of 2006 and 2007 enlarging significantly the data set compared to previous HERMES analyses. The two spin-transfer coefficients D_LX and D_LZ, i.e., transverse and along the hyperon momentum direction, are extracted and studied as function of the relevant kinematic variables.
