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题名: P-odd and CP-odd four-quark contributions to neutron EDM
作者: An, Haipeng ;  Ji, Xiangdong ;  Xu, Fanrong
刊名: JOURNAL OF HIGH ENERGY PHYSICS
出版日期: 2010
期号: 2, 页码:-
关键词: ELECTRIC-DIPOLE MOMENT ;  QCD SUM-RULES ;  QUANTUM CHROMODYNAMICS ;  SUPERSYMMETRIC MODELS ;  FIELD-THEORY ;  VIOLATION ;  CONSERVATION ;  CONSTRAINTS ;  INVARIANCE ;  NUCLEONS
学科分类: Physics
通讯作者: An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA
部门归属: [An, HP; Ji, XD] Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA; [An, HP; Ji, XD] Univ Maryland, Dept Phys, College Pk, MD 20742 USA; [Ji, XD] Shanghai Jiao Tong Univ, Inst Particle Phys & Cosmol, Dept Phys, Shanghai 200240, Peoples R China; [Ji, XD] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China; [Ji, XD] Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China; [Xu, FR] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
英文摘要: In a class of beyond-standard-model theories, CP-odd observables, such as the neutron electric dipole moment, receive significant contributions from flavor-neutral P-odd and CP-odd four-quark operators. However, considerable uncertainties exist in the hadronic matrix elements of these operators strongly affecting the experimental constraints on CP-violating parameters in the theories. Here we study their hadronic matrix elements in combined chiral perturbation theory and nucleon models. We first classify the operators in chiral representations and present the leading-order QCD evolutions. We then match the four-quark operators to the corresponding ones in chiral hadronic theory, finding symmetry relations among the matrix elements. Although this makes lattice QCD calculations feasible, we choose to estimate the non-perturbative matching coefficients in simple quark models. We finally compare the results for the neutron electric dipole moment and P-odd and CP-odd pion-nucleon couplings with the previous studies using naive factorization and QCD sum rules. Our study shall provide valuable insights on the present hadronic physics uncertainties in these observables.
资助者: U.S. Department of Energy[DE-FG02-93ER-40762]; China
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000275223100043
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5174
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
An, Haipeng,Ji, Xiangdong,Xu, Fanrong. P-odd and CP-odd four-quark contributions to neutron EDM[J]. JOURNAL OF HIGH ENERGY PHYSICS,2010(2):-.
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