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Dark Photon Search in the Mass Range Between 1.5 and 3.4 GeV/$c^2$
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arxiv 1705.04265 v2 pith:3O5GMT7C submitted 2017-05-11 hep-ex
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abstract
Using a data set of 2.93 fb$^{-1}$ taken at a center-of-mass energy $\sqrt{s}$ = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions $e^+e^-\rightarrow e^+e^-\gamma_{\rm ISR}$ and $e^+e^-\rightarrow \mu^+\mu^-\gamma_{\rm ISR}$ for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic pairs. We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/$c^{2}$ and set a 90% confidence level upper limit on the mixing strength of the dark photon and the Standard Model photon. We obtain a competitive limit in the tested mass range.
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Using LZ nuclear recoil data, the authors derive 90% CL exclusion limits on cosmic-ray-boosted sub-GeV dark matter for two U(1)' mediator models, with energy-dependent cross sections improving the lower reach versus c...
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