Exploring scalar contributions with $K^+ \to π^+ \ell^+ \ell^-$
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916306679234560 |
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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 | The rare kaon decay $K^+ \to π^+\ell^+\ell^-$ offers insights into Standard Model (SM) physics and beyond. Driven by vector form factor in the SM, it can also probe non-standard contributions. In this letter we study the scalar contribution, $f_S$. Using differential decay width and Forward-Backward Asymmetry we propose a simultaneous fit to vector and scalar contributions which is necessary for a consistent analysis. Novel bounds on $|f_S|$ are presented for the first time through a reinterpretation of the E865, NA48/2, and NA62 experimental results. The analysis results in the most precise bound $f_S < 7.9\times 10^{-6}$ at 90$\%$ confidence level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03643 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring scalar contributions with $K^+ \to π^+ \ell^+ \ell^-$ D'Ambrosio, G. Iyer, A. M. Mahmoudi, F. Neshatpour, S. High Energy Physics - Phenomenology High Energy Physics - Experiment The rare kaon decay $K^+ \to π^+\ell^+\ell^-$ offers insights into Standard Model (SM) physics and beyond. Driven by vector form factor in the SM, it can also probe non-standard contributions. In this letter we study the scalar contribution, $f_S$. Using differential decay width and Forward-Backward Asymmetry we propose a simultaneous fit to vector and scalar contributions which is necessary for a consistent analysis. Novel bounds on $|f_S|$ are presented for the first time through a reinterpretation of the E865, NA48/2, and NA62 experimental results. The analysis results in the most precise bound $f_S < 7.9\times 10^{-6}$ at 90$\%$ confidence level. |
| title | Exploring scalar contributions with $K^+ \to π^+ \ell^+ \ell^-$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2404.03643 |