Scholarlink

<p>We investigate the co-scattering mechanism for dark matter production in an EFT framework which contains new <i>Z</i><sub>2</sub>-odd singlets, namely two fermions <i>N</i><sub>1<i>,</i>2</sub> and a real scalar <i>χ</i>. The singlet scalar <i>χ</i> is the dark matter candidate. The dimension-5 operators play a vital role to set the observed DM relic density. We focus on a nearly degenerate mass spectrum for the <i>Z</i><sub>2</sub> odd particles to allow for a significant contribution from the co-scattering or co-annihilation mechanisms. We present two benchmark points where either of the two mechanisms primarily set the DM relic abundance. The main constraint on the model at the LHC arise from the ATLAS mono-<i>γ</i> search. We obtain the parameter space allowed by the observed relic density and the mono-<i>γ</i> search after performing a scan over the key parameters, the masses <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({M}_{{N}_{\text{1,2}}}\)</EquationSource> </InlineEquation><i>, M</i><sub><i>χ</i></sub> and couplings <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({c}_{3}{\prime},{y}_{\text{11,22}}{\prime}\)</EquationSource> </InlineEquation>. We find the region of parameter space where the relic abundance is set primarily by the co-scattering mechanism while being allowed by the LHC search. We also determine how the model can be further probed at the HL-LHC via the mono-<i>γ</i> signature.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Illuminating scalar dark matter co-scattering in EFT with monophoton signatures

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月2日

查看全文
  • Geneviève Bélanger,
  • Manimala Mitra,
  • Rojalin Padhan,
  • Abhishek Roy

摘要

We investigate the co-scattering mechanism for dark matter production in an EFT framework which contains new Z2-odd singlets, namely two fermions N1,2 and a real scalar χ. The singlet scalar χ is the dark matter candidate. The dimension-5 operators play a vital role to set the observed DM relic density. We focus on a nearly degenerate mass spectrum for the Z2 odd particles to allow for a significant contribution from the co-scattering or co-annihilation mechanisms. We present two benchmark points where either of the two mechanisms primarily set the DM relic abundance. The main constraint on the model at the LHC arise from the ATLAS mono-γ search. We obtain the parameter space allowed by the observed relic density and the mono-γ search after performing a scan over the key parameters, the masses \({M}_{{N}_{\text{1,2}}}\) , Mχ and couplings \({c}_{3}{\prime},{y}_{\text{11,22}}{\prime}\) . We find the region of parameter space where the relic abundance is set primarily by the co-scattering mechanism while being allowed by the LHC search. We also determine how the model can be further probed at the HL-LHC via the mono-γ signature.