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Nonresonant Searches for Axion-Like Particles in Vector Boson Scattering Processes at the LHC
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abstract
We propose a new search for Axion-Like Particles (ALPs), targeting Vector Boson Scattering (VBS) processes at the LHC. We consider nonresonant ALP-mediated VBS, where the ALP participates as an off-shell mediator. This process occurs whenever the ALP is too light to be produced resonantly, and it takes advantage of the derivative nature of ALP interactions with the electroweak Standard Model bosons. We study the production of $ZZ$, $Z\gamma$, $W^\pm \gamma$, $W^\pm Z$ and $W^\pm W^\pm$ pairs with large diboson invariant masses in association with two jets. Working in a gauge-invariant framework, upper limits on ALP couplings to electroweak bosons are obtained from a reinterpretation of Run 2 public CMS VBS analyses. The constraints inferred on ALP couplings to $ZZ$, $Z\gamma$ and $W^\pm W^\pm$ pairs are very competitive for ALP masses up to 100 GeV. They have the advantage of being independent of the ALP coupling to gluons and of the ALP decay width. Simple projections for LHC Run 3 and HL-LHC are also calculated, demonstrating the power of future dedicated analyses at ATLAS and CMS.
Forward citations
Cited by 9 Pith papers
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ALP pair production at the LHC
Non-resonant gg→aa→4γ production could constrain the dimension-6 ALP-gluon coupling down to ~10^-3 TeV^-2 at 300 fb^-1, but the allowed parameter space remains unbounded along multiple flat directions.
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A global analysis of ALP-mediated multiboson production at the LHC
A global fit to LHC multiboson data constrains the three ALP-gauge couplings to cG below 0.41, cW below 1.09 and cB below 1.78 at 2 sigma, for fa equal to 1 TeV.
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Comprehensive ALP Searches in Meson Decays
A new open-source tool, ALPaca, computes axion-like particle constraints from meson decays and finds that only the non-universal DFSZ model with large tan beta can explain the Belle II B+ to K+ plus missing energy exc...
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Analysis of axion-like particles in a top-quark pair production at the CLIC
A simulation shows the CLIC gamma-gamma mode could exclude ALP-top couplings down to about 0.11 TeV^-1 for ALP masses near 10 GeV.
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ALP and $Z^\prime$ boson at the Electron-Ion collider
Projected EIC tri-electron searches would constrain electron-coupled ALPs and Z' bosons more strongly than current experiments at masses of about 10-100 GeV and 10-30 GeV, respectively.
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Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC
Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.
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GeV ALP from TeV Vector-like leptons
A TeV-scale model with vector-like leptons and a Peccei-Quinn scalar predicts a GeV ALP with tunable couplings, while resolving the muon g-2 and neutrino-mass puzzles.
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Axions and Axion-like particles: collider searches
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
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