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<p>We assume the coupling of Axion-like particle (ALP) to diphoton <i>g</i><sub><i>aγγ</i></sub> ~ 0 and accomplish detailed analyses for the <i>γZ</i> decay mode of such heavy photophobic ALPs at the high luminosity-Large Hadron Collider (HL-LHC). ALPs are produced with two jets via both the <i>s</i>-channel vector boson exchange and vector boson fusion processes, with the signal process <i>pp</i> → <i>jja</i>(→ <i>γZ</i>(→ <i>ℓ</i><sup>+</sup><i>ℓ</i><sup><i>−</i></sup>)) for <i>ℓ</i> = <i>e</i>, <i>μ</i>. Signal and background events are simulated at the detector-level. Preselection criteria target events with one photon, two oppositely charged electrons or muons, and two non-<i>b</i>-tagged jets. The ALP mass is reconstructed, and kinematic observables are input into a machine learning-based multivariate analysis for optimal background rejection. Discover sensitivities on the ALP’s coupling to di-<i>W</i> boson, <i>g</i><sub><i>aWW</i></sub>, are presented in the mass range from 100 to 4000 GeV at center-of-mass energy <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26403_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="30" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msqrt> <mi>s</mi> </msqrt> </math></EquationSource> <EquationSource Format="TEX">\( \sqrt{s} \)</EquationSource> </InlineEquation> = 14 TeV and integrated luminosity <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26403_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">L</mi> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{L} \)</EquationSource> </InlineEquation> = 3 ab<sup><i>−</i>1</sup> and 140 fb<sup><i>−</i>1</sup>. Sensitivities on the production cross section <i>σ</i>(<i>pp → jja</i>) times the branching ratio Br(<i>a → γZ</i>) are also presented.</p>

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Search for the γZ decay mode of heavy photophobic axion-like particles at the LHC

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  • 发表日期：

    2025年6月11日

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  • Zilong Ding,
  • Ying-nan Mao,
  • Kechen Wang

摘要

We assume the coupling of Axion-like particle (ALP) to diphoton gaγγ ~ 0 and accomplish detailed analyses for the γZ decay mode of such heavy photophobic ALPs at the high luminosity-Large Hadron Collider (HL-LHC). ALPs are produced with two jets via both the s-channel vector boson exchange and vector boson fusion processes, with the signal process pp → jja(→ γZ(→ ℓ+ℓ−)) for ℓ = e, μ. Signal and background events are simulated at the detector-level. Preselection criteria target events with one photon, two oppositely charged electrons or muons, and two non-b-tagged jets. The ALP mass is reconstructed, and kinematic observables are input into a machine learning-based multivariate analysis for optimal background rejection. Discover sensitivities on the ALP’s coupling to di-W boson, gaWW, are presented in the mass range from 100 to 4000 GeV at center-of-mass energy s \( \sqrt{s} \) = 14 TeV and integrated luminosity L \( \mathcal{L} \) = 3 ab−1 and 140 fb−1. Sensitivities on the production cross section σ(pp → jja) times the branching ratio Br(a → γZ) are also presented.