Search for a light muon-philic Z' with the NA64-e experiment at CERN
arxiv(2024)
摘要
The inclusion of an additional U(1) gauge L_μ - L_τ symmetry would
release the tension between the measured and the predicted value of the
anomalous muon magnetic moment: this paradigm assumes the existence of a new,
light Z' vector boson, with dominant coupling to μ and τ and
interacting with electrons via a loop mechanism. The L_μ - L_τ model
can also explain the Dark Matter relic abundance, by assuming that the Z'
boson acts as a "portal" to a new Dark Sector of particles in Nature, not
charged under known interactions. In this work we present the results of the
Z' search performed by the NA64-e experiment at CERN SPS, that collected ∼ 9 × 10^11 100-GeV electrons impinging on an active thick target.
Despite the suppressed Z' production yield with an electron beam, the limits
sets by NA64-e are competitive with other experimental searches, and
partially exclude the g-2 preferred model parameter values for Z' masses
lighter than 2 MeV. This result proves the complementarity of this search with
NA64-μ, the parallel effort of the NA64 collaboration with a muon beam.
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