<p>We propose a new class of dark-shower signatures in Standard Model extensions featuring Hidden Valleys or dark sectors coupled through an s-channel mediator. In this framework, unstable dark pions appear as long-lived particles (LLPs), with their lifetimes treated as free parameters. The resulting signatures, which we term semi-visible emerging jets (SVEJ), continuously interpolate between the established semi-visible and emerging jet regimes. We outline an analysis strategy optimized for dark pion lifetimes of order <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>10</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{O}(10) $</EquationSource> </InlineEquation> mm, and reinterpret existing LLP searches targeting lifetimes of <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>100</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{O}(100) $</EquationSource> </InlineEquation>–<InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>1000</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{O}(1000) $</EquationSource> </InlineEquation> mm. Our proposed SVEJ search, exploiting the current ATLAS emerging-jet trigger, achieves sensitivity to cross sections of <InlineEquation ID="IEq4"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>0.1</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{O}(0.1) $</EquationSource> </InlineEquation> fb for lifetimes around <InlineEquation ID="IEq5"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <mn>10</mn> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{O}(10) $</EquationSource> </InlineEquation> mm. Finally, we advocate a more detailed study, including hadronisation uncertainties and detector-level effects.</p>

Semi-visible emerging jets

期刊论文
出版模式：

开放获取
发表日期：

2026年7月23日

查看全文

Juliana Carrasco,
Suchita Kulkarni,
Wei Liu,
Joshua Lockyer,
Jose Zurita

摘要

We propose a new class of dark-shower signatures in Standard Model extensions featuring Hidden Valleys or dark sectors coupled through an s-channel mediator. In this framework, unstable dark pions appear as long-lived particles (LLPs), with their lifetimes treated as free parameters. The resulting signatures, which we term semi-visible emerging jets (SVEJ), continuously interpolate between the established semi-visible and emerging jet regimes. We outline an analysis strategy optimized for dark pion lifetimes of order $O (10)$ $ \mathcal{O}(10) $ mm, and reinterpret existing LLP searches targeting lifetimes of $O (100)$ $ \mathcal{O}(100) $ – $O (1000)$ $ \mathcal{O}(1000) $ mm. Our proposed SVEJ search, exploiting the current ATLAS emerging-jet trigger, achieves sensitivity to cross sections of $O (0.1)$ $ \mathcal{O}(0.1) $ fb for lifetimes around $O (10)$ $ \mathcal{O}(10) $ mm. Finally, we advocate a more detailed study, including hadronisation uncertainties and detector-level effects.