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An, Haipeng; Ji, Xiangdong; Xu, Fanrong; An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA
P-odd and CP-odd four-quark contributions to neutron EDM
Source PublicationJOURNAL OF HIGH ENERGY PHYSICS
KeywordElectric-dipole Moment Qcd Sum-rules Quantum Chromodynamics Supersymmetric Models Field-theory Violation Conservation Constraints Invariance Nucleons
AbstractIn 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.
2010
ISSN1126-6708
Issue2Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationU.S. Department of Energy[DE-FG02-93ER-40762]; China ; U.S. Department of Energy[DE-FG02-93ER-40762]; China ; U.S. Department of Energy[DE-FG02-93ER-40762]; China ; U.S. Department of Energy[DE-FG02-93ER-40762]; China
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5174
Collection理论物理所科研产出_SCI论文
Corresponding AuthorAn, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA
Recommended Citation
GB/T 7714
An, Haipeng,Ji, Xiangdong,Xu, Fanrong,et al. P-odd and CP-odd four-quark contributions to neutron EDM[J]. JOURNAL OF HIGH ENERGY PHYSICS,2010(2):-.
APA An, Haipeng,Ji, Xiangdong,Xu, Fanrong,&An, HP , Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA.(2010).P-odd and CP-odd four-quark contributions to neutron EDM.JOURNAL OF HIGH ENERGY PHYSICS(2),-.
MLA An, Haipeng,et al."P-odd and CP-odd four-quark contributions to neutron EDM".JOURNAL OF HIGH ENERGY PHYSICS .2(2010):-.
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