Ξc - Ξ′c mixing from lattice QCD

被引：13
作者：
Liu, Hang [1 ]
Liu, Liuming [2 ,3 ]
Sun, Peng [2 ,3 ]
Sun, Wei [4 ]
Tan, Jin-Xin [1 ]
Wang, Wei [1 ,5 ]
Yang, Yi-Bo [3 ,6 ,7 ,8 ]
Zhang, Qi-An [9 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Particle Astrophys & Cosmol MOE, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[5] Chinese Acad Sci, Inst Modern Phys, Southern Ctr Nucl Sci Theory SCNT, Huizhou 516000, Guangdong, Peoples R China
[6] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
[7] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
[8] Int Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China
[9] Beihang Univ, Sch Phys, Beijing 102206, Peoples R China
来源：
PHYSICS LETTERS B | 2023年 / 841卷
关键词：
2ND-ORDER POWER CORRECTIONS; QUARK EFFECTIVE THEORY;
D O I：
10.1016/j.physletb.2023.137941
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In heavy quark limit, the lowest-lying charmed baryons with two light quarks can form an SU(3) triplet and sextet. The Xi(c) in the SU(3) triplet and Xi'(c) in the sextet have the same J(PC) quantum number and can mix due to the finite charm quark mass and the fact the strange quark is heavier than the up/down quark. We explore the Xi(c)-Xi'(c) mixing by calculating the two-point correlation functions of the Xi(c) and Xi'(c) baryons from lattice QCD. Based on the lattice data, we adopt two independent methods to determine the mixing angle between Xi(c) and Xi'(c). After making the chiral and continuum extrapolation, it is found that the mixing angle theta is 1.2 degrees +/- 0.1 degrees, which seems insufficient to account for the large SU(3) symmetry breaking effects found in weak decays of charmed baryons. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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页数：10
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