新山　雅之
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2021/09
形態種別 その他
標題 QCD and the strange baryon spectrum
執筆形態 その他
掲載誌名 PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
出版社・発行元 ELSEVIER
巻・号・頁 120
著者・共著者 Tetsuo Hyodo,Masayuki Niiyama
概要 The strange quark plays a unique role in QCD, reflecting its intermediate
mass between the light and heavy quarks. In recent years, remarkable progress
has been made in the spectroscopy of baryons with strangeness. Many new
features of the strange baryon spectrum have been revealed by accurate
experimental data with novel techniques, as well as systematic developments of
theoretical framework to describe hadron resonances. The basic properties of
strange baryons, namely, the pole positions, spin and parity, and decay
branching ratios, are being determined accurately. As a consequence, the
Particle Data Group have added new entries in the particle listings, such as
the $\Lambda(1380)$ and the $\Omega(2012)$. The developments of the
spectroscopy stimulate intensive discussion on the exotic internal structure of
strange baryons beyond the ordinary three-quark configuration. In this review,
we introduce the basics of QCD, the scattering theory, and the exotic internal
structure of hadrons, emphasizing the importance of the pole positions of the
scattering amplitude for the characterization of hadron resonances. We then
summarize the current status of selected strange baryon resonances;
$\Lambda(1405)$, $\Lambda(1670)$, $\Xi(1620)$, $\Xi(1690)$, and $\Omega(2012)$,
from theoretical and experimental viewpoints.
DOI 10.1016/j.ppnp.2021.103868
ISSN 0146-6410/1873-2224
PermalinkURL http://arxiv.org/abs/2010.07592v2
researchmap用URL http://arxiv.org/pdf/2010.07592v2