Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

[
0.00
] – not rated yet
Voters
0
Comments 0

2012-04-25

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages. 5 figures

Scientific paper

We reexamine properties of the baryon antidecuplet $\Theta^+$ and $N^*$, and the $\pi N$ sigma term within the framework of a chiral soliton model, focusing on their dependence on the $\Theta^+$ mass. It turns out that the measured value of the $N^*$ mass, $M_{N^*}=1686$ MeV, is consistent with that of the $\Theta^+$ mass $M_{\Theta^+}=1524$ MeV by the LEPS collaboration. The $N^*\to N\gamma$ magnetic transition moments are almost independent of the $\Theta^+$ mass. The ratio of the radiative decay width $\Gamma_{nn^*}$ to $\Gamma_{pp^*}$ turns out to be around 5. The decay width for $\Theta^+\to NK$ is studied in the context of the LEPS and DIANA experiments. When the LEPS value of the $\Theta^+$ mass is employed, we obtain $\Gamma_{\Theta NK} =(0.5\pm0.1)$ MeV. The $\pi N$ sigma term is found to be almost independent of the $\Theta^+$ mass. In addition, we derive a new expression for the $\pi N$ sigma term in terms of the isospin mass splittings of the hyperon octet as well as that of the antidecuplet $N^*$.

**Kim Hyun-Chul**

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientist

**Yang Ghil-Seok**

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientist

No associations

LandOfFree

If you have personal experience with

$Θ^+$ baryon, $N^* (1685)$ resonance, and $πN$ sigma term in the context of the LEPS and DIANA experimentsdoes not yet have a rating. At this time, there are no reviews or comments for this scientific paper.$Θ^+$ baryon, $N^* (1685)$ resonance, and $πN$ sigma term in the context of the LEPS and DIANA experiments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and $Θ^+$ baryon, $N^* (1685)$ resonance, and $πN$ sigma term in the context of the LEPS and DIANA experiments will most certainly appreciate the feedback.

Profile ID: LFWR-SCP-O-138776

Use Google custom search:

All data on this website is collected from public sources.
Our data reflects the most accurate information available at the time of publication.