Roper-like resonances with various flavor contents and their two-pion emission decays

被引：16

作者：

Arifi, A. J. ^{[1
]}

Nagahiro, H. ^{[1
,2
]}

Hosaka, A. ^{[1
,3
]}

Tanida, K. ^{[3
]}

机构：

[1] Osaka Univ, Res Ctr Nucl Phys RCNP, Ibaraki, Osaka 5670047, Japan

[2] Nara Womens Univ, Dept Phys, Nara 6308506, Japan

[3] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW D | 2020年 / 101卷 / 11期

关键词：

XI;

D O I：

10.1103/PhysRevD.101.111502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the three-body decay of the newly observed bottom baryon Lambda(b)*(6072) by LHCb; Lambda(b)*(6072) -> Delta(b)pi pi. Its mass about 500 MeV above the ground state Lambda(b) and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon N(1440). In terms of sequential processes going through Sigma(b) and Sigma(b)*, we find that the observed invariant mass distribution is reproduced assuming its spin and parity J(P) = 1/2(+). We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.

引用

页数：5

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