Polarization observables in semileptonic $V\to P$ decays of quarkonia
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915361343930368 |
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| author | Tran, Chien-Thang Ivanov, Mikhail A. Nguyen, Ngoc-Dung Vo, Quang-Chau |
| author_facet | Tran, Chien-Thang Ivanov, Mikhail A. Nguyen, Ngoc-Dung Vo, Quang-Chau |
| contents | We investigate the weak semileptonic decays of the charmonium $J/ψ$ and bottomonium $Υ(1S)$ into a pseudoscalar meson, namely, the $J/ψ\to D_{(s)}\ell\barν_\ell$ and $Υ(1S)\to B_{(c)}\ell\barν_\ell$ decays. We focus on the polarization observables including the forward-backward asymmetry, final lepton polarization, and lepton-side convexity parameter. In order to define these quantities, we apply the helicity amplitude method and obtain a twofold angular decay distribution for a general $V\to P\ell\barν_\ell$ case. The hadronic form factors are taken from our previous work, where they were calculated in the Covariant Confined Quark Model. We provide theoretical predictions for the polarization observables and compare them with the literature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21902 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarization observables in semileptonic $V\to P$ decays of quarkonia Tran, Chien-Thang Ivanov, Mikhail A. Nguyen, Ngoc-Dung Vo, Quang-Chau High Energy Physics - Phenomenology We investigate the weak semileptonic decays of the charmonium $J/ψ$ and bottomonium $Υ(1S)$ into a pseudoscalar meson, namely, the $J/ψ\to D_{(s)}\ell\barν_\ell$ and $Υ(1S)\to B_{(c)}\ell\barν_\ell$ decays. We focus on the polarization observables including the forward-backward asymmetry, final lepton polarization, and lepton-side convexity parameter. In order to define these quantities, we apply the helicity amplitude method and obtain a twofold angular decay distribution for a general $V\to P\ell\barν_\ell$ case. The hadronic form factors are taken from our previous work, where they were calculated in the Covariant Confined Quark Model. We provide theoretical predictions for the polarization observables and compare them with the literature. |
| title | Polarization observables in semileptonic $V\to P$ decays of quarkonia |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.21902 |