Electric dipole moments of charged leptons in the split fermion scenario in the two Higgs doublet model

We predict the charged lepton electric dipole moments in the split fermion scenario in the framework of the two Higgs doublet model. We observe that the numerical value of the muon (tau) electric dipole moment is of the order of the magnitude of 10^-22 e cm (10^-20 e cm) and there is an enhancement in the case of two extra dimensions, especially for the tau lepton electric dipole moment. Received: 15 July 2005, Published online: 6 October 2005     

Charged lepton electric dipole moments with localized leptons and new Higgs doublet in the two Higgs doublet model

We study the electric dipole moments of the leptons in the split fermion scenario, in the two Higgs doublet model, where the new Higgs scalars are localized around the origin in the extra dimension, with the help of the localizer field. We observe that the numerical value of the electric dipole moment of the electron (muon, tau) is of the order of the magnitude of 10^-31 (10^-24, 10^-22) (e cm), and this quantity is sensitive to the new Higgs localization in the extra dimension.     

Roton dipole moment

The roton excitation in the superfluid ⁴He does not possess a stationary dipole moment. However, a roton has an instantaneous dipole moment, such that at any given moment one can find it in the state either with positive or with negative dipole moment projection on its momentum direction. The instantaneous value of electric dipole moment of roton excitation is evaluated. The result is in reasonable agreement with recent experimental observation of the splitting of microwave resonance absorption line at roton frequency under external electric field.     

Resuscitation of the three-scalar doublet model with spontaneous CP violation

We show that the three-scalar doublet model with spontaneous CP violation and natural flavor conservation can be made consistent with the recent measurements of $\text{?′}\text{?}$ provided an interesting hierarchy among the vacuum expetation values present in the model is assumed. Simultaneously ΔM(K_L?K_S), the ? parameter and the electric dipole moment of the neutron are consistent with the experimental data.     

Electric and weak electric dipole form factors for heavy fermions in a general two Higgs doublet model

The electric and weak electric dipole form factors for heavy fermions are calculated in the context of the most general two Higgs doublet model (2HDM). We find that a large top mass can produce a significant enhancement of the electric dipole form factor in the case of the b and c quarks. This effect can be used to distinguish between different 2HDM scenarios. Received: 30 April 1999 / Revised version: 23 Juny 1999 / Published online: 14 October 1999     

The methyl doublet splitting in N,N-dimethylformamide

The methyl doublet splitting of N,N-dimethylformamide (DMF) at infinite dilution in selected solvents consisting of non-polar, isotropic molecules varies linearly with (ε - 1)(2ε + n ²)^-1, where ε is the dielectric constant of the solvent and n is the refractive index of the DMF. Extrapolation to unit dielectric constant suggests that in an isolated DMF molecule (at room temperature, where a planar geometry exists) there is no methyl doublet splitting. In other words the well-known methyl doublet splitting is entirely solvent-induced. Assuming a reaction field model it is possible to calculate from the slope of the line that the direction of the molecular electric dipole of DMF is at 30° to the C-N bond and approximately parallel to the carbonyl bond. This agrees with predictions made from the observed direction of the moment in the formamide molecule.     

Electric dipole moment of Dirac fermionic dark matter

The direct limit of electric dipole moment and direct searches for dark matter by electric dipole interaction are investigated with including the electromagnetic nuclear form factor, in case that the dark matter candidate is a Dirac particle. The electric dipole moment of dark matter constrained by direct searches must be lower than 7×¹⁰−22e cm for dark matter mass of 100 GeV to satisfy the current experimental exclusion limits at XENON10 and CDMS II. The CP violation of electric dipole moment and the dark matter discovery by electric dipole interaction in the future are considered.     

Time-reversal-violating generation of static magnetic and electric fields and a problem of electric dipole moment measurement

It is shown that in the experiments for the search of the electric dipole moment of an electron (atom, molecule) the T-odd magnetic moment induced by an electric field and the T-odd electric dipole moment induced by a magnetic field will be also measured. How to distinguish these contributions is discussed here.     

Electric Dipole Moment Function of the OH Molecule

The electric dipole moment function of the OH radical in the ground electronic state is constructed for internuclear distances R [0, ]. The electric dipole moment function is represented as a piecewise continuous function satisfying physically exact asymptotes and experimental values of the electric dipole moment and its derivatives for equilibrium positions of nuclei of the radical. The Padé form for the electric dipole moment function of the OH radical is also approximated. Electric dipole moment functions obtained are compared with the results of ab initio calculations.     

Plasma Polarization Around Dust Particle in an External Electric Field

The effect of plasma polarization around a negatively charged dust particle is investigated with the help of Monte Carlo simulation of ion trajectories in the electric field of the dust particle and an external electric field. The induced dipole moment of such a system was estimated in a wide range of dust particle and plasma parameters. It is shown that the dipole moment is very large, and has a non‐monotonous dependence on the external electric field. For a small external electric field, it weakly depends on the charge of the dust particle. The dipole moment reduces with the decrease of ion mean free path (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Measurement of the electric dipole moment of NO (X2 Π ν = 0,1) by mid-infrared laser magnetic resonance spectroscopy

A pair of parallel Stark plates are added to a CO laser magnetic resonance spectrometer to apply electric field in the absorption cell. This apparatus is used to measure the molecular electric dipole moment via Zeeman and Stark effects simultaneously. The saturated absorption spectra of NO (X²Π_3/2, ν = 1 ← 0) was observed and the electric dipole moments of NO were directly measured in the presence of an electric field. The dipole moments are determined as μ₀(ν = 0) = 0.1595(15) D, μ₁ (ν = 1) = 0.1425(16) D. The electric dipole moment of the vibrationally excited state (ν = 1) is determined for the first time. The dependence of the electric dipole moments on its nuclear distances is interpreted.     

Schiff moment of the mercury nucleus and the proton dipole moment

We calculated the contribution of internal nucleon electric dipole moments to the Schiff moment of (199) Hg. The contribution of the proton electric dipole moment was obtained via core polarization effects that were treated in the framework of random phase approximation with effective residual forces. We derived a new upper bound |d(p)|<5.4 x 10(-24)e cm of the proton electric dipole moment.     

Strong <Emphasis Type="Italic">CP</Emphasis> violation and the neutron electric dipole form factor

We calculate the neutron electric dipole form factor induced by the CP-violating θ term of QCD within a perturbative chiral quark model which includes pion and kaon clouds. On this basis, we derive the neutron electric dipole moment and the electron—neutron Schiff moment. From the existing experimental upper limits on the neutron electric dipole moment, we extract constraints on the θ parameter and compare our results with other approaches. The text was submitted by the authors in English.     

The electric moment of a spherical particle,with the conductivity of the particle and medium taken into account

The behavior of a solid particle in an inhomogeneous electric field depends on the size and sign of the electric dipole moment of the particle. The dipole moment of a spherical particle is calculated, taking into account the conductivity of the particle and the surrounding medium.     

Polarized electric dipole moment of well-deformed reflection asymmetric nuclei

The expression for polarized electric dipole moment of well-deformed reflection asymmetric nuclei is obtained in the framework of the liquid-drop model in the case of geometrically similar proton and neutron surfaces. The expression for polarized electric dipole moment consists of the first- and second-order terms. It is shown that the second-order correction terms of the polarized electric dipole moment are important for well-deformed nuclei.     

R-parity violating contribution to the neutron electric dipole moment at one-loop order

We present the full result for the down squark mass-squared matrix in the complete theory of supersymmetry without R parity where all kinds of R-parity violating terms are admitted without bias using an optimal parametrization. The major result is a new contribution to LR squark mixing, involving both bilinear and trilinear R-parity violating couplings. Among other things, the latter leads to neutron electric dipole moment at one-loop level. Similar mechanisms lead to electron electric dipole moment at the same level. We present here a short report on major features of neutron electric dipole moment from supersymmetry without R parity and give the interesting constraints obtained.     

Control of the motion of nanoelectromechanical systems based on carbon nanotubes

A new method is proposed for controlling the motion of nanoelectromechanical systems based on carbon nanotubes. In this method, a single-walled nanotube acquires an electric dipole moment owing to the chemical adsorption of atoms or molecules at open ends of the nanotube and, then, the electric dipole moment thus induced can be set in motion under the effect of a nonuniform electric field. The electric dipole moments of chemically modified nanotubes are calculated for the first time. The possibility of controlling the motion of nanotube-based nanoelectromechanical systems with the proposed method is demonstrated using a gigahertz oscillator as an example. The operating characteristics of the gigahertz oscillator and the controlling electric field are calculated.     

Frequency and intensity measurements in the fundamental infrared band of HD

The fundamental band of HD has been studied at room temperature and 0.6 atm pressure with a 48-m absorption path and a resolution of 0.01 cm^?1. The frequencies of nine electric dipole and three electric quadrupole transitions were measured with an accuracy of 0.001 cm^?1, and their analysis gives improved molecular parameters for the v = 0 and 1 states of HD. The intensities of the dipole transitions were measured in order to determine the v = 1-0 electric dipole transition moment. These measurements extend earlier experiments to higher J values, thus refining the determination of the rotational dependence of the transition moment.     

The electric dipole moment of the neutron in the Kobayashi-Maskawa model

A possible mechanism for producing a neutron electric dipole moment to order G_F² in the Kobayashi-Maskawa model is proposed; the consequent order of magnitude of the dipole moment would be 10^?30 cm in units of the electric charge.     

A model for a large electric dipole moment of the neutron

It is shown that a mixing of ordinary quarks and mirror quarks could induce a large electric dipole moment, d_n, for the neutron. For an about 1% mixing the prediction is |d_n| ≅ 10⁻²⁵ e cm. Recent results of two experimental groups, one at the Leningrad Nuclear Physics Institute and the other at the Institute Laue-Langevin, Grenoble, indicate that the dipole moment may have such a high value.