New physics at the MUonE experiment at CERN

Abstract

A confirmation of the long-standing muon $g$-2 discrepancy requires both experimental and theoretical progress. On the theory side, the hadronic corrections are under close scrutiny, as they induce the leading uncertainty of the Standard Model prediction. Recently, the MUonE experiment has been proposed at CERN to provide a new determination of the leading hadronic contribution to the muon $g$-2 via the measurement of the differential cross section of muon-electron scattering. The precision expected at this experiment raises the question whether possible new-physics (NP) could affect its measurements. We address this issue studying possible NP signals in muon-electron collisions due to heavy or light mediators, depending on whether their mass is higher or lower than $\mathcal{O}(1\mathrm{GeV})$. We analyze the former in a model-independent way via an effective field theory approach, whereas for the latter we focus on scenarios with light scalar and vector bosons. Using existing experimental bounds, we show that possible NP effects in muon-electron collisions are expected to lie below MUonE's sensitivity. This result confirms and reinforces the physics case of the MUonE proposal.

arXiv comment10 pages. V2: few typos corrected, two references added. V3: published version

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Cited by in corpus (33)

• The anomalous magnetic moment of the muon in the Standard Model
• Resolving electron and muon $g-2$ within the 2HDM
• Dark matter assisted lepton anomalous magnetic moments and neutrino masses
• QED at NNLO with McMule
• Solving the electron and muon $g-2$ anomalies in $Z^{\prime }$ models
• Muon-electron scattering at NNLO
• Status of the MUonE experiment
• Towards muon-electron scattering at NNLO
• NNLO virtual and real leptonic corrections to muon-electron scattering
• The LBK theorem to all orders
• New physics behind the new muon $g$-2 puzzle?
• Model Independent Tests of the Hadronic Vacuum Polarization Contribution to the Muon $g$$-$$2$
• Probing light mediators at the MUonE experiment
• Probing the $L_{\mu }$-$L_{\tau }$ Gauge Boson at the MUonE Experiment
• Single ${\pi }^0$ production in $\mu e$ scattering at MUonE
• Probing for chiral $Z^{\prime }$ gauge boson through scattering measurement experiments
• Dark Photons and Displaced Vertices at the MUonE Experiment
• MUonE, muon $g-2$ and electroweak precision constraints within 2HDMs
• Timelike and spacelike kernel functions for the hadronic vacuum polarization contribution to the muon anomalous magnetic moment
• Lepton pair production in muon-nucleus scattering
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• High-energy frontier of the muon g-2 at a muon collider
• Conceptual Design of the Muonium-to-Antimuonium Conversion Experiment (MACE)
• Multiple soft-photon emission at next-to-leading power to all orders
• Electroweak effects in polarized muon-electron scattering
• Probing the muon (g-2) anomaly at the LHC in final states with two muons and two taus
• Theory for the MUonE experiment
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• New Physics contamination to precision luminosity measurements at future $e^{+}{e}^{-}$ colliders
• New Physics Searches at Kaon and Hyperon Factories
• Universal structure of radiative QED amplitudes at one loop
• Towards NNLO corrections to muon-electron scattering
• Status of the MUonE experiment