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Electric dipole moments and polarizability in the quark-diquark model of the neutron

Y. N. Srivastava, University of Perugia, Italy; Northeastern University; INFN, Italy
A. Widom, Northeastern University
J. Swain, Northeastern University
O. Panella, INFN, Italy

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Originally posted at http://arxiv.org/abs/1006.0579v1.

Abstract

For a bound state internal wave function respecting parity symmetry, it can be rigorously argued that the mean electric dipole moment must be strictly zero. Thus, both the neutron, viewed as a bound state of three quarks, and the water molecule, viewed as a bound state of ten electrons two protons and an oxygen nucleus, both have zero mean electric dipole moments. Yet, the water molecule is said to have a nonzero dipole moment strength $d=e\Lambda $ with $\Lambda_{H_2O} \approx 0.385\ \dot{A}$. The neutron may also be said to have an electric dipole moment strength with $\Lambda_{neutron} \approx 0.612\ fm$. The neutron analysis can be made experimentally consistent, if one employs a quark-diquark model of neutron structure.

Suggested Citation

Y. N. Srivastava, A. Widom, J. Swain, and O. Panella. "Electric dipole moments and polarizability in the quark-diquark model of the neutron" 2010
Available at: http://works.bepress.com/jswain/15

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