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Light baryon spectroscopy at BESIII

Ronggang Ping

TL;DR

The paper addresses the structure of light baryon resonances that challenge conventional three-quark models by performing comprehensive partial-wave analyses of ψ(3686) decays at BESIII. It employs large data samples and off-resonance data to extract N* and Λ* contributions, constraining the N(1535) Nη coupling, confirming the Λ(1405) two-pole structure via chiral-unitary dynamics, and discovering a new Λ(2325) state with J^P = 3/2−. These results provide stringent tests of competing pictures such as molecular-like dynamically generated states and pentaquark configurations, and showcase the efficacy of e+e− colliders in probing non-perturbative QCD in the light-baryon sector. The findings have significant implications for understanding baryon spectroscopy, exotic generation mechanisms, and the role of strangeness content in nucleon resonances, guiding future BESIII studies.

Abstract

Based on the data sample of $2.7\times 10^{9}$ $ψ(3686)$ events collected with the BESIII detector, this contribution presents recent advances in baryon spectroscopy. Key results from amplitude analyses of the decay channels $ψ(3686) \to p\bar{p}π^{0}$, $ψ(3686) \to p\bar{p}η$, and $ψ(3686) \to Λ\barΣ^{0}π^{0} + c.c.$ are summarized. Prospects for future baryon spectroscopy studies at BESIII are also discussed.

Light baryon spectroscopy at BESIII

TL;DR

The paper addresses the structure of light baryon resonances that challenge conventional three-quark models by performing comprehensive partial-wave analyses of ψ(3686) decays at BESIII. It employs large data samples and off-resonance data to extract N* and Λ* contributions, constraining the N(1535) Nη coupling, confirming the Λ(1405) two-pole structure via chiral-unitary dynamics, and discovering a new Λ(2325) state with J^P = 3/2−. These results provide stringent tests of competing pictures such as molecular-like dynamically generated states and pentaquark configurations, and showcase the efficacy of e+e− colliders in probing non-perturbative QCD in the light-baryon sector. The findings have significant implications for understanding baryon spectroscopy, exotic generation mechanisms, and the role of strangeness content in nucleon resonances, guiding future BESIII studies.

Abstract

Based on the data sample of events collected with the BESIII detector, this contribution presents recent advances in baryon spectroscopy. Key results from amplitude analyses of the decay channels , , and are summarized. Prospects for future baryon spectroscopy studies at BESIII are also discussed.

Paper Structure

This paper contains 4 sections, 1 equation, 2 figures.

Table of Contents

  1. Introduction
  2. Experimental Study of $N(1535)$ in $\psi(3686) \to p\bar{p}\pi^0$ and $p\bar{p}\eta$ Decays
  3. Partial Wave Analysis of $\psi(3686)\to\Lambda\bar{\Sigma}^{0}\pi^{0}$
  4. Summary and Outlook

Figures (2)

  • Figure 1: Projections of the PWA fits for $\psi(3686) \to p\bar{p}\pi^0$ on (a) $M_{p\bar{p}}$, (b) $M_{p\pi^0}$, (c) $M_{\bar{p}\pi^0}$ and for $\psi(3686) \to p\bar{p}\eta$ on (d) $M_{p\bar{p}}$, (e) $M_{p\eta}$, (f) $M_{\bar{p}\eta}$.
  • Figure 2: Projections of the PWA fits for $\psi(3686) \to \Lambda\bar{\Sigma}\pi^0$ on $M_{\Lambda\bar{\Sigma}^0}$, $M_{\pi^0\Lambda}$, and $M_{\pi^0\bar{\Sigma}^0}$.