ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $t\bar{t}$ production

Abstract

We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top-anti-top-quark ($t\bar{t}$) final states, focusing on generic axion-like particles (ALPs) that are coupled to top quarks and gluons. As a first step, we derive new limits on the effective ALP Lagrangian in terms of the Wilson coefficients $c_t$ and $c_{\tilde{G}}$ based on the results of the CMS search using $35.9$ fb${}^{-1}$ of data, collected at $\sqrt{s}=13$ TeV. We then investigate how the production of an ALP with generic couplings to gluons and top quarks can be distinguished from the production of a pseudoscalar which couples to gluons exclusively via a top-quark loop. To this end, we make use of the invariant $t\bar{t}$ mass distribution and angular correlations that are sensitive to the $t\bar{t}$ spin correlation. Using a mass of 400 GeV as an example, we find that already the data collected during Run 2 and Run 3 of the LHC provides an interesting sensitivity to the underlying nature of a possible new particle. We also analyze the prospects for data anticipated to be collected during the high-luminosity phase of the LHC. Finally, we compare the limits obtained from the $t\bar{t}$ searches to existing experimental bounds from LHC searches for narrow di-photon resonances, from measurements of the production of four top quarks, and from global analyses of ALP-SMEFT interference effects.

28 pages, 9 figures

References in corpus (37)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• The landscape of QCD axion models
• Collider Probes of Axion-Like Particles
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Beyond the Minimal Composite Higgs Model
• HiggsBounds-5: Testing Higgs Sectors in the LHC 13 TeV Era
• Axion Kinetic Misalignment Mechanism
• The Low-Energy Effective Theory of Axions and ALPs
• Flavor probes of axion-like particles
• Recent Progress in the Physics of Axions and Axion-Like Particles
• Quark Flavor Phenomenology of the QCD Axion
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• Top pair invariant mass distribution: a window on new physics
• Anomalous solutions to the strong CP problem
• The High Quality QCD Axion and the LHC
• Running in the ALPs
• Top Quark Pairs at High Invariant Mass - A Model-Independent Discriminator of New Physics at the LHC
• Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations
• Minimal Flavor Violation with Axion-like Particles
• Challenges and opportunities for heavy scalar searches in the $t\bar{t}$ channel at the LHC
• A Composite Higgs with a Heavy Composite Axion
• Displaced or invisible? ALPs from $B$ decays at Belle II
• Analyzing the CP Nature of a New Scalar Particle via S->Zh Decay
• Grand Color Axion
• Interference Effects in $t\bar{t}$ Production at the LHC as a Window on New Physics
• Supersizing axions with small size instantons
• Top Secrets: Long-Lived ALPs in Top Production
• A global analysis of axion-like particle interactions using SMEFT fits
• Probing the Interactions of Axion-Like Particles with Electroweak Bosons and the Higgs Boson in the High Energy Regime at LHC
• Enhanced EDMs from Small Instantons
• Precise tests of the axion coupling to tops
• The shift-invariant orders of an ALP
• Aiming for Tops of ALPs with a Muon Collider
• Higgs interference effects in top-quark pair production in the 1HSM
• Prospects for probing axionlike particles at a future hadron collider through top quark production
• Dark Matter Searches with Top Quarks

Cited by in corpus (4)

• Interplay of ALP Couplings at a Muon Collider
• Top-quark spin correlations as a tool to distinguish pseudoscalar $A\to ZH$ and scalar $H\to ZA$ signatures in $Zt\bar{t}$ final states at the LHC
• Search for dark matter produced in association with one or two top quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Top observables as precise probes of the ALP