image and η measurement with photon conversions in ALICE in proton-proton collisions at image

We present a measurement of the image transverse momentum spectrum and of the image ratio in proton-proton collisions at image at the CERN LHC. In this analysis the reconstruction of image and η mesons has been done via photon conversions in the central tracking system of ALICE. Therefore, this method is completely independent from the electromagnetic calorimeters. It makes the image (η) measurement possible down to image with a very good resolution and a very small background. For 108 pp collisions the image reach is 7 GeV/c. The results are compared to NLO pQCD calculations.