October 13, 2025Open Access

Roper resonance N^* (1440) from charmonium decays

Key Points

The study shows evidence of the Roper resonance N*(1440) through charmonium decay observations.
Initial observation occurred 40 years after its discovery, now clarified by charmonium decays.
These findings contribute to our understanding of the multiquark nature of the resonance.
Charmonium decay processes have provided significant insights into the nature of N*(1440).

Abstract

The Roper resonance N^* (1440) was discovered by David Roper in 1964 through sophisticated partial-wave analyses of πN scattering data. However the first direct observation of the Roper resonance peak in the πN invariant mass spectrum was only realized 40 years later from the charmonium decay J/ψ pnπ^+ +c. c. at Beijing Electron-Positron Collider. The further observations of the Roper resonance production from various charmonium decays helped to reveal its multiquark nature with large σN component.

Ask AI

Helpful

Bookmark

View Full Paper

Cite This Study

Bing-Song Zou (Sun,) studied this question.

synapsesocial.com/papers/68ecfebf950606aabec09405 https://doi.org/https://doi.org/10.48550/arxiv.2509.11290

Ask AI

Helpful

Bookmark

View Full Paper