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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.20526 |
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| _version_ | 1866911613673537536 |
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| author | Gao, Zhi Ping, Ronggang Zhao, Minggang |
| author_facet | Gao, Zhi Ping, Ronggang Zhao, Minggang |
| contents | We present an updated analysis of the angular distribution for $ψ(3686) \to p\bar{p}$ decay, taking into account transverse beam polarization, to investigate potential sources of forward-backward asymmetry and azimuthal modulation beyond the simple $1+α\cos^2θ$ form. We focus on the interference between the $ψ(3686)$ resonance and the two-photon exchange continuum process, as well as the background from initial-state-final-state radiation interference. A maximum-likelihood fit to the $\cosθ$ distribution of $ψ(3686)\to p\bar{p}$ yields $α= 1.00 \pm 0.03$, consistent with previous results. Our model predicts a significant $\sin(2ϕ)$ modulation in the azimuthal angle, indicating the influence of transverse beam polarization. These findings motivate future two-dimensional angular analyses to fully disentangle the polarization and interference dynamics in charmonium decays to baryon pairs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20526 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Update analysis of $ψ(3686)\to p\bar{p}$ Gao, Zhi Ping, Ronggang Zhao, Minggang High Energy Physics - Phenomenology We present an updated analysis of the angular distribution for $ψ(3686) \to p\bar{p}$ decay, taking into account transverse beam polarization, to investigate potential sources of forward-backward asymmetry and azimuthal modulation beyond the simple $1+α\cos^2θ$ form. We focus on the interference between the $ψ(3686)$ resonance and the two-photon exchange continuum process, as well as the background from initial-state-final-state radiation interference. A maximum-likelihood fit to the $\cosθ$ distribution of $ψ(3686)\to p\bar{p}$ yields $α= 1.00 \pm 0.03$, consistent with previous results. Our model predicts a significant $\sin(2ϕ)$ modulation in the azimuthal angle, indicating the influence of transverse beam polarization. These findings motivate future two-dimensional angular analyses to fully disentangle the polarization and interference dynamics in charmonium decays to baryon pairs. |
| title | Update analysis of $ψ(3686)\to p\bar{p}$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.20526 |