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

• DOI: 10.1007/jhep12(2024)197
• Publication Date: 2025-01-06T23:21:24Z
• Authors: Afiq Anuar; Anke Biekötter; Thomas Biekötter; Alexander Grohsjean; Sven Heinemeyer; Laurids Jeppe; Christian Schwane...; Georg Weiglein
• Keywords: interference: effect; interpretation of experiments: CERN LHC Coll; spin: correlation; dip; 610; FOS: Physical sciences; Top Quark; QC770-798; interpretation of experiments: CMS; 530; mass spectrum; High Energy Physics - Phenomenology (hep-ph); Nuclear and particle physics. Atomic energy. Radioactivity; TeV; Axions and ALPs; info:eu-repo/classification/ddc/530; pseudoscalar; Specific BSM Phenomenology; two-photon; angular correlation; Physics; ddc:530; gluon; sensitivity; High Energy Physics - Phenomenology; axion-like particles; top: pair production; Multi-Higgs Models; new particle

A bstract We present an analysis of the sensitivity current and future LHC searches for new spin-0 particles in top–anti-top-quark $$ \left(t\overline{t}\right) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfenced> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:mfenced> </mml:math> final states, focusing on generic axion-like (ALPs) that are coupled to top quarks gluons. As a first step, we derive limits effective ALP Lagrangian terms Wilson coefficients c t {c}_{\overset{\sim }{G}} <mml:msub> <mml:mi>c</mml:mi> <mml:mi>G</mml:mi> <mml:mo>~</mml:mo> </mml:msub> based results CMS search using 35 . 9 fb − 1 data, collected at \sqrt{s} <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> = 13 TeV. then investigate how production with couplings gluons can be distinguished from pseudoscalar which couples exclusively via top-quark loop. To this end, make use invariant t\overline{t} mass distribution angular correlations sensitive spin correlation. Using 400 GeV as example, find already data during Run 2 3 provides interesting underlying nature possible particle. also analyze prospects anticipated high-luminosity phase LHC. Finally, compare obtained existing experimental bounds narrow di-photon resonances, measurements four quarks, global analyses ALP–SMEFT interference effects.