Located at CERN's North Area and receiving beams from the Super Proton Synchrotron (SPS), the NA64 and NA62 experiments search for dark matter, complementing searches at the LHC, as they cover a different energy range. Both experiments have recently published new results. The research is published on the arXiv preprint server.
Schematic side view of the NA62 beamline and detector used in 2018. Credit:Located at CERN's North Area and receiving beams from the Super Proton Synchrotron , the NA64 and NA62 experiments search for dark matter, complementing searches at the LHC, as they cover a different energy range. Both experiments have recently published new results. The research is published on theDark matter does not seem to interact with our visible world but makes up most of our universe.
The NA62 experiment, which was designed to study the ultra-rare kaon decay into a charged pion and two neutrinos, has now searched for possible contributions fromparticles to another rare kaon decay. The researchers used a beam consisting mainly of pions and kaons, produced by firing the 400 GeV/c SPS proton beam onto a beryllium target.
The rare kaon decay into a pion and a pair of photons, subsequently decaying into two electron-positron pairs, is particularly interesting, as hypothetically, dark bosons would decay into the same final states as Standard Model photons. Although the experimentalists did not find evidence for such a rare decay, nor for a dark boson, they placed the most stringent upper limits to date by analyzing data recorded in 2017 and 2018. In addition, the experimentalists excluded the axion as a possible explanation for the 17 MeV/c2 ATOMKI anomaly and thus confirmedThe NA64 collaboration hunts for invisible light dark-matter particles that interact with Standard Model particles through a possible dark photon.
Their data set excludes leading sub-GeV dark-matter candidates with a coupling between the dark-matter particle and the dark photon for a range of dark-matter particle masses, ruling out both models. To obtain these results, the NA64 experiment used a 100 GeV/c electron beam generated from protons interacting with a fixed target.
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