Electric dipole moment of light nuclei in chiral effective field theory

CP-violating interactions at quark level generate CP-violating nuclear interactions and currents, which could be revealed by looking at the presence of a permanent nuclear electric dipole moment. Within the framework of chiral effective field theory, we discuss the derivation of the CP-violating nuclear potential up to next-to-next-to leading order (N2LO) and the preliminary results for the charge operator up to next-to leading order (NLO). Moreover, we introduce some renormalization argument which indicates that we need to promote the short-distance operator to the leading order (LO) in order to reabsorb the divergences generated by the one pion exchange. Finally, we present some selected numerical results for the electric dipole moments of 2H, 3He and 3H discussing the systematic errors introduced by the truncation of the chiral expansion.

Моделирование источника ультрахолодных нейтронов на реакторе ПИК

The paper presents the simulation of a complex of reserch with ultracold neutrons at the reactor PIK (Gatchina, Russia). The complex is being built on the basis of a high-intensity source of ultracold neutrons at the channel GEK-4. A Monte Carlo model has been developed, which includes a source, a neutron guide system and an experimental setup for search for the electric dipole moment of a neutron, taking into account their real location in the main hall of the reactor. Using the developed computer model the density of ultracold neutrons in the setup was obtained, which is 200 ^-3. It is 50 times higher than at the source at the Institut Laue-Langevin (Grenoble, France). This density will allow to achieve a sensitivity of measurements in the experiment of 1·10^-27 е·cm/year.

Передача крутящего момента проводящей частице с использованием силы Лоренца

In the paper the concept of conductive particle rotation in DC electric field with including the Lorentz force providing generation of electric dipole moment of the particle is for the first time discussed. Some models of the torque transfer to spherical and cylindrical particles based on of the Hall effect at usual geometry and with additional electric field application and also in the case of implementation of the photoelectromagnetic effect are presented.

Electromagnetic Information Transfer (EMIT) by Ultra High Diluted (UHD) solutions: the suggestive hypothesis of an epigenetic action.

The aim of this work is to confirm the theoretical possibility of an epigenetic mechanism shared between EMIT and UHD. The presentation will be divided in three sections: 1. Water aggregates with an electric dipole moment (UHD succussed solutions) as mediators of weak specific bioelectromagnetic signals on target stem cells. Recent experimental works confirm the developing concept of water mediated Electromagnetic Information Transfer (EMIT) of specific molecular signals, picked up from the source biological effector, on target stem cells with evident effect on their proliferation [1]. Similar Electromagnetic (EM) emission and consequences are also reported by the scientific literature on rotational excited aggregates with an electric dipole moment, created in polar liquids by Ultra High Diluted (UHD) or High Diluted (HD) succussed solutions. These aggregates are composed of solvent molecules only or a combination of these and solute particles [2]. 2. DNA mediated physiopathological effects of ELF EMFs In detail, according to the International Agency for Research on Cancer (IARC), the extremely low-frequency (ELF) electromagnetic fields (EMFs) are classified as "possible carcinogenic" based on their effects [3-5], although most scientists agree that they are too weak to kill cells or to cause mutations and thus initiate cancer. Besides the prevailing paradigm of the environmentally-induced acute and chronic diseases involving either cell killing (cytotoxicity) or gene/chromosome mutations (genotoxicity), many studies concerning the biological and health consequences of ELF-EM exposure report that alteration of the expression of genetic information at the transcriptional, translational, or posttranslational levels has the potential to contribute to various diseases. 3. Epigenetic mechanism shared between EMIT and UHDs The latter referred mechanism, denoted as "epigenetic" (that affects gene expression rather than gene structure), is characterized by threshold-like action, multiple biochemical pathways and it needs chronic regular exposures to be effective [6]. Epigenetic factors affect one of four potential cell states, namely alteration of cell proliferation, cell differentiation, programmed cell death (apoptosis) or adaptive responses of differentiated cells, and probably they act as co-inductors of DNA damage rather than as a genotoxic agents per se. At the present time, studies on genomic and functional genetic are identifying many genes and gene variants that potentially modulate the fundamental molecular mechanisms underpinning both physiological and pathological processes.

Method to evaluate systematic uncertainties due to magnet misalignments in Electric Dipole Moment measurements using a storage ring

Various scenarios of measurements of Electric Dipole Moment (EDM) of light hadrons with the use of a storage ring were proposed. Most of these methods are based on the measurement of the vertical spin component for an initially horizontal polarized beam. Since the expected EDM effect is very small, one has to payattention to various sources of systematic uncertainties. One of the most important sources are misalignments of the magnets forming the storage ring lattice, which may produce an effect that mimics an EDM. This false signal could be much larger than the expected EDM signal, even for very small magnet misalignments. This paper describes a novel method for the determination of the contribution of magnets misalignments to the expected EDM signal. It is shown that the magnitude of this effect could be estimated via a Fourier analysis of the time-dependent vertical polarization. This could be achieved by sampling the vertical polarization with a frequency larger than the beam revolution frequency, which corresponds to polarization measurements in at least two positions in the storage ring. The presented method can be applied to any scenario proposed for EDM measurements using a storage ring.

Neutron Oscillations and the Parity Doubling Theorem

We review several aspects of parity and CP violation in the framework of neutron-antineutron oscillations. We focus on the parity doubling theorem, which provides a criterion for neutron oscillation in the general theory with ΔB=2 baryon number-violating interactions. We prove by explicit calculations that the violation of the conventional parity symmetry with P2=1 is the necessary condition for neutron oscillations to happen. While the CP violation is not manifest in the oscillation, it is nevertheless intrinsic to the system, and it is transferred, by the mixing matrix, to the neutron interactions and potentially observable as a contribution to the electric dipole moment.