Exploration of the Muon g-2 and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam
arxiv(2024)
摘要
We report on a search for a new Z' (L_μ-L_τ) vector boson performed
at the NA64 experiment employing a high energy muon beam and a missing
energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton
Synchrotron with a momentum of 160 GeV/c are directed to an active target. A
signal event is a single scattered muon with momentum < 80 GeV/c in the final
state, accompanied by missing energy, i.e. no detectable activity in the
downstream calorimeters. For a total statistic of (1.98±0.02)×10^10
muons on target, no event is observed in the expected signal region. This
allows us to set new limits on part of the remaining (m_Z', g_Z')
parameter space which could provide an explanation for the muon (g-2)_μ
anomaly. Additionally, our study excludes part of the parameter space suggested
by the thermal Dark Matter relic abundance. Our results pave the way to explore
Dark Sectors and light Dark Matter with muon beams in a unique and
complementary way to other experiments.
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