English

Refined analysis of $\Omega^{-} \bar{\Omega}^{+}$ polarization in electron-positron annihilation process

High Energy Physics - Phenomenology 2023-12-08 v1

Abstract

We investigate the production of spin-3/2 hyperon pairs, ΩΩˉ+\Omega^- \bar{\Omega}^+, in electron-positron annihilation within the helicity amplitude formalism. A refined selection of helicity basis matrices is proposed to relate polarization expansion coefficients and spin density matrix elements and to illuminate their inherent physical interpretations and symmetrical properties. With a novel parametrization scheme of helicity amplitudes, we perform an analysis of polarization correlation coefficients for double-tag ΩΩˉ+\Omega^- \bar{\Omega}^+ pairs. We present three sets of expressions to describe the decay of Ω\Omega^{-} hyperons, and further address the existing tension in the measurements of its decay parameters, particularly ϕΩ\phi_{\Omega}. The method and the framework developed in this paper can also be applied to studies of the production and decay mechanisms of other spin-3/2 particles.

Keywords

Cite

@article{arxiv.2312.04363,
  title  = {Refined analysis of $\Omega^{-} \bar{\Omega}^{+}$ polarization in electron-positron annihilation process},
  author = {Zhe Zhang and Jiao Jiao Song and Ya-jin Zhou},
  journal= {arXiv preprint arXiv:2312.04363},
  year   = {2023}
}

Comments

43 pages, 4 figures