Status for 2019, CERN NA63

Abstract

In the NA63 experiment of April 2018 data was taken for 20, 40 and 80 GeV electrons and positrons aligned to the h100i axis of a diamond crystal of thickness 1.5 mm, as well as for 40 and 80 GeV electrons on a 1.0 mm thick diamond aligned to the h100i axis. Off-line analysis has shown that the direction of the crystallographic axis cannot be found with certainty for the 2018 data for 20 GeV, and thus this data set has been discarded. However, the comparison between data and theoretical simulations performed for several angular settings for the 40 and 80 GeV data show remarkable agreement with calculations including the Landau Lifshitz force with a few quantum corrections. A draft of a paper for submission will be finished within the coming month. For the 2017 data, the analysis is finished, shows good results, and a draft of a paper for submission will be finished within the coming month