P-odd and CP-odd four-quark contributions to neutron EDM
文献类型：期刊论文
| 作者 | Ji, Xiangdong; An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA; An, Haipeng; Xu, Fanrong |
| 刊名 | JOURNAL OF HIGH ENERGY PHYSICS
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| 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 |
| ISSN号 | 1126-6708 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000275223100043 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5174]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA |
| 推荐引用方式 GB/T 7714 | Ji, Xiangdong,An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA,An, Haipeng,et al. P-odd and CP-odd four-quark contributions to neutron EDM[J]. JOURNAL OF HIGH ENERGY PHYSICS,2010(2):-. |
| APA | Ji, Xiangdong,An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA,An, Haipeng,&Xu, Fanrong.(2010).P-odd and CP-odd four-quark contributions to neutron EDM.JOURNAL OF HIGH ENERGY PHYSICS(2),-. |
| MLA | Ji, Xiangdong,et al."P-odd and CP-odd four-quark contributions to neutron EDM".JOURNAL OF HIGH ENERGY PHYSICS .2(2010):-. |
入库方式： OAI收割
来源：理论物理研究所
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