Probing scalar and pseudoscalar new physics using rare kaon decays
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| Format: | Preprint |
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2025
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| author | D'Ambrosio, G. Iyer, A. M. Mahmoudi, F. Neshatpour, S. |
| author_facet | D'Ambrosio, G. Iyer, A. M. Mahmoudi, F. Neshatpour, S. |
| contents | Rare kaon decays provide sensitive tests of new physics. In this work, we focus on scalar and pseudoscalar operators, analysing the $K\to π\ell^+\ell^-$ and $K\to \ell^+\ell^-$ decays. We highlight the complementary role of different modes: $K^+\toπ^+\ell^+\ell^-$, in particular the forward-backward asymmetry in the muon channel as a clean probe of scalar effects, the stringent constraints from $K_L\to μ^+μ^-$, and the discovery potential of future measurements of $K_S\to μ^+μ^-$ and $K_L\to π^0 \ell^+\ell^-$. The interplay between charged and neutral modes underscores the complementarity of NA62, the LHCb upgrade, and KOTO-II. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_16903 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing scalar and pseudoscalar new physics using rare kaon decays D'Ambrosio, G. Iyer, A. M. Mahmoudi, F. Neshatpour, S. High Energy Physics - Phenomenology Rare kaon decays provide sensitive tests of new physics. In this work, we focus on scalar and pseudoscalar operators, analysing the $K\to π\ell^+\ell^-$ and $K\to \ell^+\ell^-$ decays. We highlight the complementary role of different modes: $K^+\toπ^+\ell^+\ell^-$, in particular the forward-backward asymmetry in the muon channel as a clean probe of scalar effects, the stringent constraints from $K_L\to μ^+μ^-$, and the discovery potential of future measurements of $K_S\to μ^+μ^-$ and $K_L\to π^0 \ell^+\ell^-$. The interplay between charged and neutral modes underscores the complementarity of NA62, the LHCb upgrade, and KOTO-II. |
| title | Probing scalar and pseudoscalar new physics using rare kaon decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.16903 |