Ab initio three-loop calculation of the W-exchange contribution to nonleptonic decays of double charm baryons

被引：40

作者：

Gutsche, Thomas ^{[1
]}

Ivanov, Mikhail A. ^{[2
]}

Koerner, Juergen G. ^{[3
]}

Lyubovitskij, Valery E. ^{[1
,4
,5
,6
,7
]}

Tyulemissov, Thomart ^{[2
]}

机构：

[1] Univ Tubingen, Inst Theoret Phys, Kepler Ctr Astro & Particle Phys, Morgenstelle 14, D-72076 Tubingen, Germany

[2] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

[3] Johannes Gutenberg Univ Mainz, Inst Phys, PRISMA Cluster Excellence, D-55099 Mainz, Germany

[4] Univ Tecn Federico Santa Maria, Dept Fis, Casilla 110-5, Valparaiso, Chile

[5] Univ Tecn Federico Santa Maria, Ctr Cient Tecnol Valparaiso CCTVal, Casilla 110-5, Valparaiso, Chile

[6] Tomsk State Univ, Dept Phys, Tomsk 634050, Russia

[7] Tomsk Polytech Univ, Lab Particle Phys, Tomsk 634050, Russia

来源：

PHYSICAL REVIEW D | 2019年 / 99卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.99.056013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have made an ab initio three-loop quark model calculation of the W-exchange contribution to the nonleptonic two-body decays of the doubly charmed baryons Xi(++)(cc) and Omega(+)(cc). The W-exchange contributions appear in addition to the factorizable tree graph contributions and are not suppressed in general. We make use of the covariant confined quark model previously developed by us to calculate the tree graph as well as the W-cxchange contribution. We calculate hclicity amplitudes and quantitatively compare the tree graph and W-exchange contributions. Finally, we compare the calculated decay widths with those from other theoretical approaches when they are available.

引用

页数：7

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