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<p>We investigate a novel collider signature within the minimal Left-Right Symmetric Model, featuring a Higgs sector composed of a bi-doublet and two triplets. Our study focuses on a region of the parameter space where the SU(2)<sub><i>R</i></sub> charged gauge boson <i>W</i><sub><i>R</i></sub> lies in the multi-TeV regime (3–100 TeV) and the additional Higgs states play a significant role. In this scenario, a heavy neutral Higgs boson ∆ with a dominant SU(2)<sub><i>R</i></sub> triplet component can be produced in association with either a Standard Model Higgs boson or a massive weak boson. The subsequent decay of the heavy Higgs into Majorana neutrinos <i>N</i> results in displaced lepton signatures, providing a striking manifestation of lepton number violation. Additionally, we explore how the production of <i>b</i>-jets in these processes can enhance hadron-collider sensitivity to such signals. A particularly compelling channel, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26570_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="93" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="italic">pp</mi> <mo>→</mo> <mi>b</mi> <mover accent="true"> <mi>b</mi> <mo stretchy="true">¯</mo> </mover> <mi mathvariant="italic">NN</mi> </math></EquationSource> <EquationSource Format="TEX">\( pp\to b\overline{b} NN \)</EquationSource> </InlineEquation>, offers the exciting possibility of simultaneously probing the spontaneous mass origin of both Dirac fermions and Majorana states. Based on an optimised event selection strategy and state-of-the-art Monte Carlo simulations, we outline the expected reach at the HL-LHC and future colliders. Our findings demonstrate that this channel probes a region of parameter space where the neutral Higgs triplet and heavy neutrino masses are relatively light (<i>m</i><sub>∆</sub> ≲ 250 GeV, <i>m</i><sub><i>N</i></sub> ≲ 80 GeV), indirectly constraining the <i>W</i><sub><i>R</i></sub> boson to the deep multi-TeV domain, with sensitivity extending up to 70–80 TeV, effectively turning the LHC into a precision machine.</p>

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Beautiful Majorana Higgses at colliders

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月26日

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  • Benjamin Fuks,
  • Jonathan Kriewald,
  • Miha Nemevšek,
  • Fabrizio Nesti

摘要

We investigate a novel collider signature within the minimal Left-Right Symmetric Model, featuring a Higgs sector composed of a bi-doublet and two triplets. Our study focuses on a region of the parameter space where the SU(2)R charged gauge boson WR lies in the multi-TeV regime (3–100 TeV) and the additional Higgs states play a significant role. In this scenario, a heavy neutral Higgs boson ∆ with a dominant SU(2)R triplet component can be produced in association with either a Standard Model Higgs boson or a massive weak boson. The subsequent decay of the heavy Higgs into Majorana neutrinos N results in displaced lepton signatures, providing a striking manifestation of lepton number violation. Additionally, we explore how the production of b-jets in these processes can enhance hadron-collider sensitivity to such signals. A particularly compelling channel, pp → b b ¯ NN \( pp\to b\overline{b} NN \) , offers the exciting possibility of simultaneously probing the spontaneous mass origin of both Dirac fermions and Majorana states. Based on an optimised event selection strategy and state-of-the-art Monte Carlo simulations, we outline the expected reach at the HL-LHC and future colliders. Our findings demonstrate that this channel probes a region of parameter space where the neutral Higgs triplet and heavy neutrino masses are relatively light (m∆ ≲ 250 GeV, mN ≲ 80 GeV), indirectly constraining the WR boson to the deep multi-TeV domain, with sensitivity extending up to 70–80 TeV, effectively turning the LHC into a precision machine.