Speaker
Dr
Paolo Crivelli
(ETH Zurich, Institute for Particle Physics)
Description
In this talk, we will report the results of our direct search for sub-GeV dark photons (A') which might be produced in the reaction
e Z -> e Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The A's would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75x10^9 electrons on target [1]. We set new limits on the gamma-A' mixing strength and exclude the invisible A' with a mass <100 MeV as an explanation of the muon g-2 anomaly. The future prospects and physics program of the NA64 experiment will be briefly presented.
[1] NA64 collaboration, Phys. Rev. Lett. 118, 011802 (2017)
Primary author
Dr
Paolo Crivelli
(ETH Zurich, Institute for Particle Physics)
