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Aug 16 – 21, 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Possible interpretation of N(1685)

Aug 21, 2019, 9:55 AM
20m
Ludi Room (Guilin Bravo Hotel, Guilin, China)

Ludi Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 2: Baryon spectroscopy Session 2: Baryon sepctroscopy

Speaker

Kai Xu (Suranaree University of Technology)

Description

$N(1685)$ was firstly reported in the photoproduction of $\eta$ meson off the quasi-free neutron. Unlike other low-lying nucleon resonances whose Breit-Wigner (BW) widths are at least $100 {\;\rm MeV}$, the BW width of the $N(1685)$ is less than $30 {\;\rm MeV}$. The interpretation of the $N(1685)$ is still an open question. The non-strange pentaquark mass of all quark configurations is evaluated in a constituent quark model, where the Cornell potential is employed and all model parameters are predetermined by comparing the theoretical and experimental masses of low-lying baryons which are believed to be mainly $3q$ states. The state with the $[31]_{FS}[22]_{F}[31]_{S}(q^4 \overline q)$ configuration and quantum numbers $I(J^P)=\frac1{2}(\frac1{2}^{-})$ is predicted to be the lowest pentaquark state. Its mass is derived about $1670 {\;\rm MeV}$, which encourages one to expect that the $N(1685)$ could be the lowest pentaquark state.

Primary author

Kai Xu (Suranaree University of Technology)

Co-authors

Attaphon Kaewsnod (S) Mr Sorakrai Srisuphaphon (Department of Physics, Faculty of Science, Burapha University, Chonburi 20131, Thailand) Yupeng Yan (Suranaree University of Technology)

Presentation materials