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New physics searches with heavy-ion collisions at the LHC
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abstract
This document summarises proposed searches for new physics accessible in the heavy-ion mode at the CERN Large Hadron Collider (LHC), both through hadronic and ultraperipheral $\gamma\gamma$ interactions, and that have a competitive or, even, unique discovery potential compared to standard proton-proton collision studies. Illustrative examples include searches for new particles -- such as axion-like pseudoscalars, radions, magnetic monopoles, new long-lived particles, dark photons, and sexaquarks as dark matter candidates -- as well as new interactions, such as non-linear or non-commutative QED extensions. We argue that such interesting possibilities constitute a well-justified scientific motivation, complementing standard quark-gluon-plasma physics studies, to continue running with ions at the LHC after the Run-4, i.e. beyond 2030, including light and intermediate-mass ion species, accumulating nucleon-nucleon integrated luminosities in the accessible fb$^{-1}$ range per month.
Forward citations
Cited by 5 Pith papers
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New physics and tau $g-2$ using LHC heavy ion collisions
Using ultraperipheral lead-lead collisions, a lepton-plus-tracks analysis could constrain the tau anomalous magnetic moment to -0.0080 < a_tau < 0.0046 at 68% CL, three times better than DELPHI.
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Probing the existence of a new charged vector boson decaying into heavy neutral leptons using ultra-peripheral heavy ion collisions at ATLAS
The paper projects that ATLAS with lead-lead ultra-peripheral collisions could exclude or discover light charged vector bosons decaying to heavy neutral leptons in the 5 to 105 GeV mass range.
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Impact of Higgs precision measurements at the LHC and FCC-ee on the spectrum of composite Higgs models
Using κ_V = cosθ and m_η = m_h/sinθ, Higgs precision data imply singlet mass bounds of about 440 GeV (Run-2), 600 GeV (HL-LHC), and 2 TeV (FCC-ee).
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Charmonium pair production in ultraperipheral collision
NLO NRQCD predictions for exclusive J/psi pair and eta_c pair production in ultraperipheral Pb-Pb and p-p collisions at HL-LHC and FCC energies, plus Low-formula estimates for the X(6900) state.
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Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
In PbPb ultraperipheral collisions at 5.02 TeV, CMS measured the Breit-Wheeler and light-by-light fiducial cross sections in agreement with QED and set the most stringent axion-like particle limits in the 5-10 GeV mass range.
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