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Update analysis of $\psi(3686)\to p\bar{p}$

High Energy Physics - Phenomenology 2026-04-23 v4
Authors: Zhi Gao , Ronggang Ping , Minggang Zhao
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Abstract

We present an updated analysis of the angular distribution for ψ(3686)→ppˉ\psi(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+αcos⁡2θ1+\alpha\cos^2\theta form. We focus on the interference between the ψ(3686)\psi(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 cos⁡θ\cos\theta distribution of ψ(3686)→ppˉ\psi(3686)\to p\bar{p} yields α=1.00±0.03\alpha = 1.00 \pm 0.03, consistent with previous results. Our model predicts a significant sin⁡(2ϕ)\sin(2\phi) 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.

Keywords

angular distribution charmonium decay transverse beam polarization interference effects forward-backward asymmetry

Cite

@article{arxiv.2602.20526,
  title  = {Update analysis of $\psi(3686)\to p\bar{p}$},
  author = {Zhi Gao and Ronggang Ping and Minggang Zhao},
  journal= {arXiv preprint arXiv:2602.20526},
  year   = {2026}
}

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