Role of the triangle singularity in Λ(1405) production in the π- p → K0πΣ and pp → pK+ πΣ processes

被引：20

作者：

Bayar, M. ^{[1
,2
,3
]}

Pavao, R. ^{[2
,3
]}

Sakai, S. ^{[2
,3
]}

Oset, E. ^{[2
,3
]}

机构：

[1] Kocaeli Univ, Dept Phys, TR-41380 Izmit, Turkey

[2] Ctr Mixto Univ Valencia, CSIC, Dept Fis Teor, Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain

[3] Ctr Mixto Univ Valencia, CSIC, IFIC, Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain

来源：

PHYSICAL REVIEW C | 2018年 / 97卷 / 03期

关键词：

KAON-NUCLEON INTERACTIONS; CHIRAL DYNAMICS; RESONANCE; PHOTOPRODUCTION; SCATTERING; MESON;

D O I：

10.1103/PhysRevC.97.035203

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We have investigated the cross section for the pi(-) p -> K-0 pi Sigma and pp -> pK(+) pi Sigma reactions, paying attention to a mechanism that develops a triangle singularity. The triangle diagram is realized by the decay of a N* to K* Sigma and the K* decay into pi K, and the pi Sigma finally merges into Lambda (1405). The mechanism is expected to produce a peak around 2140 MeV in the K Lambda (1405) invariant mass. We found that a clear peak appears around 2100 MeV in the K Lambda (1405) invariant mass, which is about 40 MeV lower than the expectation, and that is due to the resonance peak of a N* resonance which plays a crucial role in the K* Sigma production. The mechanism studied produces the peak of the Lambda (1405) around or below 1400 MeV, as is seen in the pp -> pK(+) pi Sigma HADES experiment.

引用

页数：12