CP-violating magnetic moments of atoms and molecules
نویسندگان
چکیده
We develop a theory of electric-field-induced magnetization of a medium. The relevant polarizability, βCP , simultaneously violates the inversion symmetry (parity), the time-reversal symmetry, and the combined CP symmetry. We focus on two fundamental mechanisms mediating the appearance of βCP — the electric dipole moment of the electron (eEDM) and the electron-nucleus pseudo-scalar weak neutral currents. Measuring βCP may reveal so-far elusive eEDM and these neutral currents. We start with computing βCP for rare-gas atoms and demonstrate that βCP scales steeply as Z5 with the nuclear charge Z. Further, we show that βCP manifests itself in permanent CP-violating magnetic moments of molecules. A macroscopic sample of polarized molecules would exhibit a magnetization correlated with the direction of the externally-applied polarizing electric field. We numerically estimate this unconventional moment for diamagnetic molecules. Finally, we introduce a thermallyinduced CP-violating magnetization of a sample of paramagnetic molecules. In all cases, we evaluate the feasibility of an experimental search for eEDM. We find that paramagnetic molecules HgH embedded in a rare-gas matrix at a temperature of a few Kelvin have a remarkable sensitivity to eEDM. We conclude, that experiments with such “artificial solids” can push the current limit on the eEDM by several orders of magnitude, deep into the domain of predictions of competing extensions to the Standard Model of elementary particles.
منابع مشابه
Molecular CP-violating magnetic moment
A concept of CP-violating T,P-odd permanent molecular magnetic moments CP is introduced. We relate the moments to the electric dipole moment of electron eEDM and estimate CP for several diamagnetic polar molecules. The moments exhibit a steep, Z5, scaling with the nuclear charge Z of the heavier molecular constituent. A measurement of the CP-violating magnetization of a polarized sample of heav...
متن کاملAtomic CP-violating polarizability
Searches for CP-violating effects in atoms and molecules provide important constrains on competing extensions to the standard model of elementary particles. In particular, CP violation in an atom leads to the CP-odd T,P-odd polarizability CP: a magnetic moment CP is induced by an electric field E0 applied to an atom, CP= E0. We estimate the CP-violating polarizability for rare-gas diamagnetic a...
متن کاملElectric Dipole Moments: A Global Analysis
We perform a global analysis of searches for the permanent electric dipole moments (EDMs) of the neutron, neutral atoms, and molecules in terms of six leptonic, semileptonic, and nonleptonic interactions involving photons, electrons, pions, and nucleons. Translating the results into fundamental CP-violating effective interactions through dimension six involving Standard Model particles, we obta...
متن کاملبررسی خواص مغناطیسی تک اتمهای فلزات واسط 3d افزوده شده بر روی بورن نیتراید شش گوشی دوبعدی
In the frame work of relativistic density functional theory, using full potential local orbital band structure scheme (FPLO), the magnetic properties of single 3d transition metals (3d-TM) adsorbed on 2D hexagonal boron nitride (2D h-BN) are investigated. Binding energies between 3d-TM adatoms and 2D h-BN in three different compositions, local spin magnetic moments of 3d-TM and total spin magne...
متن کاملCP-violating phenomenology of flavor conserving two Higgs doublet models
We analyze the constraints on CP-violating, flavor conserving two Higgs doublet models implied by measurements of Higgs boson properties at the Large Hadron Collider (LHC) and by the nonobservation of permanent electric dipole moments (EDMs) of molecules, atoms, and neutrons. We find that the LHC and EDM constraints are largely complementary, with the LHC studies constraining the mixing between...
متن کامل