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Enhanced contribution to quark and neutron electric dipole moments with small mixing of rig

We study the light quark and the neutron electric dipole moments (EDMs) under the assumptions that the CP source is still in the usual CKM matrix and that there is a small mixing of right-handed charged currents in the quark sector. We find that the EDMs a

a r X i v :h e p -p h /9906245v 2 8 D e c 1999TUIMP-TH-99/107

AS-ITP-99-13

Enhanced contribution to quark and neutron electric dipole moments with small mixing of right-handed currents and CKM CP violation Yi Liao Department of Modern Applied Physics,Tsinghua University,Beijing 100084,P.R.China Xiaoyuan Li Institute of Theoretical Physics,The Chinese Academy of Sciences,Beijing 100080,P.R.China Abstract We study the light quark and the neutron electric dipole moments (EDMs)under the assumptions that the CP source is still in the usual CKM matrix and that there is a small mixing of right-handed charged currents in the quark sector.We ?nd that the EDMs arise already at two loop order that are much larger than the standard model (SM)result even for a small mixing.Keywords:electric dipole moment,right-handed current,CP violation

PACS Numbers:11.30.Er http://doc.xuehai.net 13.40.Em

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