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<p>Two-body decays like <i>K</i> → <i>πa</i> rank among the most constraining collider probes for new, low-mass, feebly interacting pseudoscalar particles <i>a</i>. We explore an alternative class of kaon decay modes, specifically three-body decays to <i>ππa</i> or <i>μμa</i>. The former occur at tree level, while the latter is loop-suppressed yet accidentally finite. These modes specifically leverage the accurate tracking capabilities at LHCb. We present an estimation approach for the sensitivity achievable in future searches within these channels. Our argument uses the current <i>uncertainty</i> in leading irreducible backgrounds identified for each channel. Our findings suggest that dedicated searches could probe <i>f</i><sub><i>a</i></sub> scales between 10<sup>4</sup> and 10<sup>6</sup> TeV, highlighting their strong potential. A direct comparison with actual searches, only available in the <i>K</i><sup>+</sup> → <i>π</i><sup>+</sup><i>π</i><sup>0</sup><i>a</i> channel, supports this conclusion. Finally, we show that, in these searches, reconstruction efficiency maps are such that large efficiencies are naturally aligned with regions of higher yields in Dalitz plots.</p>

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Probing QCD Axions or axion-like particles in three-body K decays

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月4日

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  • Maël Cavan-Piton,
  • Diego Guadagnoli,
  • Axel Iohner,
  • Diego Martínez Santos,
  • Ludovico Vittorio

摘要

Two-body decays like K → πa rank among the most constraining collider probes for new, low-mass, feebly interacting pseudoscalar particles a. We explore an alternative class of kaon decay modes, specifically three-body decays to ππa or μμa. The former occur at tree level, while the latter is loop-suppressed yet accidentally finite. These modes specifically leverage the accurate tracking capabilities at LHCb. We present an estimation approach for the sensitivity achievable in future searches within these channels. Our argument uses the current uncertainty in leading irreducible backgrounds identified for each channel. Our findings suggest that dedicated searches could probe fa scales between 104 and 106 TeV, highlighting their strong potential. A direct comparison with actual searches, only available in the K+ → π+π0a channel, supports this conclusion. Finally, we show that, in these searches, reconstruction efficiency maps are such that large efficiencies are naturally aligned with regions of higher yields in Dalitz plots.