$Σ^{+}\to p\ell^{+}\ell^{-}$ decays within the standard model and beyond
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910784764772352 |
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| author | Roy, Arnab Tandean, Jusak Valencia, German |
| author_facet | Roy, Arnab Tandean, Jusak Valencia, German |
| contents | Motivated by the LHCb measurement of the hyperon decay mode $Σ^+\to pμ^+μ^-$ and prospects for improvement, we revisit the estimates for the rate and muon forward-backward asymmetry within the standard model and beyond. The standard model prediction has a fourfold ambiguity, and we suggest ways to resolve it with other measurements, including possible studies of $Σ^+\to p e^+e^-$ in the BESIII and LHCb experiments. We use the recent BESIII measurements of $Σ^+\to p γ$ and $Σ^+\to Nπ$ to reduce the uncertainty in the long-distance contribution to $Σ^+\to pμ^+μ^-$. Beyond the standard model, we consider a general effective Hamiltonian at low energy with ten operators whose Wilson coefficients parametrize the new physics. We derive expressions for the $Σ^+\to pμ^+μ^-$ rate and the associated muon forward-backward asymmetry in terms of these coefficients. Finally, we present the constraints on these Wilson coefficients that result from both kaon and hyperon decays and emphasize their complementarity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_15268 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $Σ^{+}\to p\ell^{+}\ell^{-}$ decays within the standard model and beyond Roy, Arnab Tandean, Jusak Valencia, German High Energy Physics - Phenomenology High Energy Physics - Experiment Motivated by the LHCb measurement of the hyperon decay mode $Σ^+\to pμ^+μ^-$ and prospects for improvement, we revisit the estimates for the rate and muon forward-backward asymmetry within the standard model and beyond. The standard model prediction has a fourfold ambiguity, and we suggest ways to resolve it with other measurements, including possible studies of $Σ^+\to p e^+e^-$ in the BESIII and LHCb experiments. We use the recent BESIII measurements of $Σ^+\to p γ$ and $Σ^+\to Nπ$ to reduce the uncertainty in the long-distance contribution to $Σ^+\to pμ^+μ^-$. Beyond the standard model, we consider a general effective Hamiltonian at low energy with ten operators whose Wilson coefficients parametrize the new physics. We derive expressions for the $Σ^+\to pμ^+μ^-$ rate and the associated muon forward-backward asymmetry in terms of these coefficients. Finally, we present the constraints on these Wilson coefficients that result from both kaon and hyperon decays and emphasize their complementarity. |
| title | $Σ^{+}\to p\ell^{+}\ell^{-}$ decays within the standard model and beyond |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2404.15268 |