Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Astroparticle Physics II

HK 43.3: Talk

Thursday, March 30, 2017, 15:00–15:15, F 073

Search for Invisible Dark Photon Decays — •Martin Ripka and Achim Denig for the BESIII collaboration — KPH JGU Mainz

The direct detection of dark matter is still an open topic of highest interest in particle- and astrophysics. While the experimental search is ongoing, more and more parts of the parameter-space of many intuitive extensions to the Standard Model like super-symmetry are ruled out. Newer state of the art theories attempt to describe the dark sector more generally. A kinetic mixing of the Standard Model photon with a proposed dark photon opens the so called vector-portal to the dark sector. The dark photon may be heavier than other dark matter particles, such that it would predominantly decay invisibly. We report a search for invisible decays of dark photons with the BESIII detector at the BEPCII storage ring in Beijing, China. The dark photons are produced in the Initial State Radiation (ISR) method. Since the dark photon decays into light dark matter particles that cannot be detected, we look for narrow structures in the recoil mass spectrum of the ISR photon. The available data allow for a search of the dark photon with masses between 0-3 GeV. We can set an upper limit at the 90% confidence level on the mixing parameter of the dark photon, which completely excludes an invisibly decaying dark photon as an explanation of the Muon g-2 puzzle.

Supported by DFG under contract No SFB 1044