Prospects in the search for a new light $Z^{\prime }$ boson with the NA64$\mu$ experiment at the CERN SPS

Abstract

A light $Z^{\prime }$ vector boson coupled to the second and third lepton generations through $L_{\mu }-L_{\tau }$ current with mass below 200 MeV provides a very viable explanation in terms of new physics to the recently confirmed $(g-2{)}_{\mu }$ anomaly. This boson can be produced in the bremsstrahlung reaction $\mu N\to \mu N{Z}^{\prime }$ after a high energy muon beam collides with a target. NA64$\mu$ is a fixed-target experiment using a 160 GeV muon beam from the CERN Super Proton Synchrotron accelerator looking for the $Z^{\prime }$ production and its subsequent decays, $Z^{\prime }\to invisible$. In this paper, we present the study of the NA64$\mu$ sensitivity to search for such a $Z^{\prime }$. This includes a realistic beam simulation, the detailed detectors description and a discussion about the main potential background sources. A pilot run is scheduled in order to validate the simulation results. If those are confirmed, NA64$\mu$ will be able to explore all the remaining phase space which could provide an explanation for the $g-2$ muon anomaly.

References in corpus (49)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The anomalous magnetic moment of the muon in the Standard Model
• The muon $g-2$ and $\alpha (M_Z^2)$: a new data-based analysis
• Complete Tenth-Order QED Contribution to the Muon g-2
• Refinements in electroweak contributions to the muon anomalous magnetic moment
• Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g-2 and alpha(mZ) using newest hadronic cross-section data
• Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment revisited
• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
• Two-pion contribution to hadronic vacuum polarization
• A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to $\mathbf{\alpha }({\mathbf{m}}_{\mathbf{Z}}^2)$
• The electroweak contributions to (g-2)_μ after the Higgs boson mass measurement
• Neutrino Trident Production: A Powerful Probe of New Physics with Neutrino Beams
• The COMPASS Experiment at CERN
• Remarks on higher-order hadronic corrections to the muon g-2
• Dispersion relation for hadronic light-by-light scattering: two-pion contributions
• The hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD
• Three-pion contribution to hadronic vacuum polarization
• Dispersion relation for hadronic light-by-light scattering: pion pole
• Pseudoscalar-pole contribution to the $(g_{\mu }-2)$: a rational approach
• Short-distance constraints for the HLbL contribution to the muon anomalous magnetic moment
• Lattice calculation of the pion transition form factor with $N_f=2+1$ Wilson quarks
• Longitudinal short-distance constraints for the hadronic light-by-light contribution to $(g-2{)}_{\mu }$ with large-$N_c$ Regge models
• Cosmology With a Very Light $L_{\mu }-L_{\tau }$ Gauge Boson
• Search for a muonic dark force at BABAR
• The muon anomalous magnetic moment and a new light gauge boson
• Coherent Propagation of PeV Neutrinos and the Dip in the Neutrino Spectrum at IceCube
• M${}^3$: A New Muon Missing Momentum Experiment to Probe $(g-2{)}_{\mu }$ and Dark Matter at Fermilab
• Muon g-2 and searches for a new leptophobic sub-GeV dark boson in a missing-energy experiment at CERN
• Neutrino Tridents at DUNE
• Phenomenology of $U(1{)}_{L_{\mu }-L_{\tau }}$ charged dark matter at PAMELA/FERMI and colliders
• Muon Beam Experiments to Probe the Dark Sector
• Search for MeV dark photons in a light-shining-through-walls experiment at CERN
• Comment on "Is Dark Matter with Long-Range Interactions a Solution to All Small-Scale Problems of ΛCDM Cosmology?"
• Probing the muon g_μ-2 anomaly, L_μ - L_τ gauge boson and Dark Matter in dark photon experiments
• $Z^{\prime }$s in neutrino scattering at DUNE
• On the possibility of search for $L_{\mu }-L_{\tau }$ gauge boson at Belle-II and neutrino beam experiments
• Confirming $U(1{)}_{L_{\mu }-L_{\tau }}$ as a solution for $(g-2{)}_{\mu }$ with neutrinos
• Combined search for light dark matter with electron and muon beams at NA64
• GENFIT - a Generic Track-Fitting Toolkit
• Probing millicharged particles with NA64 experiment at CERN
• Search for an invisibly decaying $Z^{\prime }$ boson at Belle II in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}(e^{\pm }{\mu }^{\mp })$ plus missing energy final states
• Muon $(g-2)$ and XENON1T Excess with Boosted Dark Matter in $L_{\mu }-L_{\tau }$ Model
• Fully Geant4 compatible package for the simulation of Dark Matter in fixed target experiments
• Implication of the hidden sub-GeV bosons for the $(g-2{)}_{\mu }$, ${}^8$Be-${}^4$He anomaly, proton charge radius, EDM of fermions and dark axion portal
• Deep inelastic $e-\tau$ and $\mu -\tau$ conversion in the NA64 experiment at the CERN SPS
• Dark Sector first results at Belle II
• Studies for New Experiments at the CERN M2 Beamline within "Physics Beyond Colliders": AMBER/COMPASS++, NA64mu, MuonE
• Probing Hidden Sectors with a muon beam: Total and differential cross-sections for vector boson production in muon bremsstrahlung

Cited by in corpus (23)

• Systematically Testing Singlet Models for $(g-2{)}_{\mu }$
• Probing New Gauge Forces with a High-Energy Muon Beam Dump
• Axial vectors in DarkCast
• Implication of the dark axion portal for the EDM of fermions and dark matter probing with NA64$e$, NA64$\mu$, LDMX, $\mbox{M}^3$, and BaBar
• Constraining Light Thermal Inelastic Dark Matter with NA64
• On $(g-2{)}_{\mu }$ From Gauged $\mathrm{U}(1{)}_X$
• Supernova Limits on Muonic Dark Forces
• Search for a light muon-philic $Z^{\prime }$ with the NA64-$e$ experiment at CERN
• Probing light mediators at the MUonE experiment
• Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams
• Probing the $L_{\mu }$-$L_{\tau }$ Gauge Boson at the MUonE Experiment
• Searching for Muonphilic Dark Sectors with Proton Beams
• Passage of millicharged particles in the electron beam-dump: refining constraints from SLACmQ and estimating sensitivity of NA64e
• Probing for chiral $Z^{\prime }$ gauge boson through scattering measurement experiments
• Probing some photon portals to new physics at intensity frontier experiments
• New Searches for Muonphilic Particles at Proton Beam Dump Spectrometers
• Leptonic scalar portal: Origin of muon $g-2$ anomaly and dark matter?
• Probing hidden spin-2 mediator of dark matter with NA64e, LDMX, NA64$\mu$ and M${}^3$
• Resonant probing spin-0 and spin-2 dark matter mediators with fixed target experiments
• Prospects of five-dimensional $L_{\mu }-L_{\tau }$ gauge interactions in the light of elastic neutrino-electron scatterings: The scope of the DUNE near detector
• The $L_{\mu }-L_{\tau }$ solution to the IceCube Ultra High Energy neutrino deficit in light of NA64
• Exploring the Null Results in the Direct Detection Experiments, $(g-2{)}_{\ell }$ and Neutrino Mass in an Extended $U(1{)}_{L_{\mu }-L_{\tau }}$ Model Constrained through the $Z\to {\ell }^{+}{\ell }^{-}$ Decays
• Muon Beam Dump Experiments probe five-dimensional nature of $U(1{)}_{L_{\mu }-L_{\tau }}$