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Publication Citation: Constraints on Monopole-Dipole Interactions of Wisps from Polarized Gas Relaxation Time

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Author(s): Changbo Fu; Thomas R. Gentile; W M. Snow;
Title: Constraints on Monopole-Dipole Interactions of Wisps from Polarized Gas Relaxation Time
Published: August 31, 2011
Abstract: Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A P-odd, T-odd, spin-dependent interaction between polarized and unpolarized matter is one such possibility. Such a monopole-dipole interaction can be induced by the exchange of spin-0 particles. The presence of a possible monopole-dipole interaction between fermion spins and unpolarized matter would cause an decreased transverse spin relaxation time T2 for a confined gas of polarized nuclei. By reanalyzing previously existing data on the spin relaxation times of polarized 3He in gas cells with pressure in the millibar range and applying the well-established theory of spin relaxation for magnetic field gradients to gradients in a possible monopole-dipole field, we present new laboratory constraints on the strength and range of such an interaction. These constraints represent to our knowledge the best limits on such interactions for the neutron with ranges between 0.01 cm and 1 cm
Proceedings: Proceedings of the Fifth Meeting on CPT and Lorenz Asymmetry
Pages: pp. 244 - 249
Location: Bloomington, IN
Dates: June 28-July 2, 2010
Keywords: monopole-dipole; polarized gas
Research Areas: Nuclear Physics