Neutron electric dipole moment from QCD sum rules

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Neutron electric dipole moment from QCD sum rules

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Title: Neutron electric dipole moment from QCD sum rules
Author: Chan, Chuan-Tsung, 1965-
Abstract: The electric dipole moments of nucleons (NEDM, $d\sb{N}$) are calculated using the method of QCD sum rules. Our calculations are based on the parity ($/\!\!\!P$) and time reversal ($/\!\!\!T$) violating parameter $\bar\Theta$ in QCD and establish a functional dependence of the NEDM on $\bar\Theta$, without assuming a perturbative expansion of this symmetry breaking parameter. The results obtained from the QCD sum rules approach are shown to be consistent with the general symmetry constraints on $/\!\!\!P$ and $/\!\!\!T$ in QCD; including the necessity of quark masses, spontaneous chiral symmetry breaking, and the $U\sb{A}$(1) anomaly. Given the current experimental upper bound on the neutron electric dipole moment (nEDM), $d\sb{n}\le 10\sp{-26}e\cdot cm$, we find $\bar\Theta\le 10\sp{-10}$. This is compatible with previous calculations of nEDM using different techniques.
Description: Thesis (Ph. D.)--University of Washington, 1996
URI: http://hdl.handle.net/1773/9708

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