arXiv subjects

Dmitry Zhuridov

Publications and source records attributed to Dmitry Zhuridov.

18 recordsLinked to original sources

arXiv2026

Second-Order Perturbative Correction for Neutrino Oscillation Tomography of the Earth

The Earth's interior at depths exceeding present direct probing limit, which is just one five-hundredth of its radius, remains unknown to a significant extent due to existing ambiguities in predicting the distribution of temperature, pressure and chemical composition on the basis of seismic and geophysical observations. Scanning the Earth with neutrinos can provide independent information for refinement of existing seismological models. However, neutrinos interact with medium extremely weakly. Only tiny TeV-energy component of the atmospheric neutrino flux is noticeably absorbed while traversing the Earth, which provides limited statistical data. Flux reduction for much more common neutrinos with energies of the order of 1 GeV is vanishing. However, on their way through the planet they undergo sizable flavor oscillations that depend on the electron number density, which provides a link to seismological models. Accurate calculation of the matter effect in these oscillations is required for successful neutrino oscillation tomography of the Earth besides growing power of neutrino experiments, e. g., KM3NeT, DUNE and Hyper-Kamiokande. We obtained relevant neutrino oscillation probabilities in the second order of perturbation theory. Our results are valid for a neutrino potential that is not necessarily symmetric along the neutrino path. This allowed us to implement a multi-shell evolution scheme to better account for the density jumps between various layers of the Earth.

hep-ph↗

arXiv2025

Two-step focusing anamorphic catadioptric telescope and componentwise aberration compensations

Aberration compensation with emphasis on the generalized spherical aberration components is discussed for plane-symmetric and anamorphic optical systems. A narrow field-of-view double-plane symmetric telescope objective containing reflective and refractive subsystems, which focus light separately in the two dimensions of the image plane, is introduced. Analytical derivation of the compensation rules is discussed for the telescope being composed of a Cassegrain-type cylindrical reflective subsystem and an economical refractive one that is determined by up to six essential parameters. Performance of a more advanced version of this telescope, which contains a less aberrative nine-parameter refractive subsystem, is studied using the ray-tracing simulator CODE~V. The telescopes of the introduced type provide two independent focal distances for the discussed focusings in the orthogonal dimensions allowing to set up a favorable field of view, and potentially can be used to achieve larger effective aperture area and resolution on a small spacecraft.

physics.optics↗

arXiv2025

Optical systems with translational invariance

The leading order monochromatic aberrations are investigated for the optical systems, which obey single-plane symmetry and translational invariance. These aberrations are classified from the symmetry principles for the wave aberration function. The Fermat's Principle is applied for a system made of generic cylindrical surfaces and a complete set of the aberration coefficients required for calculation of the aberrations for any paraxial ray is obtained. To demonstrate the applied value of the analytical results obtained the criteria of compensation of the leading aberrations for cylindrical analog of the Cassegrain telescope were found.

physics.optics↗

arXiv2023

Monte Carlo event generation of neutrino-electron scattering

We describe an extension of the NuWro Monte Carlo neutrino event generator with the neutrino-electron scattering processes. This new dynamical channel includes the charged current and neutral current interactions, together with their interference, for $ν_\ell e$ and $\barν_\ell e$ ($\ell=e,μ,τ$) scatterings, resulting in ten possible final states. We illustrate the performance of the new functionality on few physical examples, including an estimation of the background in the T2K $ν_μ\rightarrowν_e$ oscillation experiment. We show that the background events arising from the neutrino-electron interactions occupy mostly a distinct region of the phase space and can be easily separated.

hep-ph↗

arXiv2019

Standard Model radiative corrections in the pion form factor measurements do not explain the $a_μ$ anomaly

In this letter, we address the question of whether the almost four standard deviations difference between theory and experiment for the muon anomalous magnetic moment $a_μ$ can be explained as a higher-order Standard Model perturbation effect in the pion form factor measurements. This question has, until now, remained open, obscuring the source of discrepancies between the measurements. We calculate the last radiative corrections for the extraction of the pion form factor, which were believed to be potentially substantial enough to explain the data within the Standard Model. We find that the corrections are too small to diminish existing discrepancies in the determination of the pion form factor for different kinematical configurations of low-energy BABAR, BESS-III and KLOE experiments. Consequently, they cannot noticeably change the previous predictions for $a_μ$ and decrease the deviations between theory and direct measurements. To solve the above issues, new data and better understanding of low-energy experimental setups are needed, especially as new direct $a_μ$ measurements at Fermilab and J-PARC will provide new insights and substantially shrink the experimental error.

hep-ph↗

arXiv2016

Excited lepton baryogenesis

The excited leptons that share the quantum numbers with the Standard Model leptons but have larger masses are widespread in many promising new physics theories. A subclass of excited leptons that at low energies interact with the SM fermions dominantly through the effective coupling to lepton and fermion-antifermion pair can be referred as leptomesons. I introduce possible generation of the baryon asymmetry of the universe using these new particles. The discussed baryogenesis mechanisms do not contradict to the small neutrino masses and the proton stability, and can be interesting for the collider experiments.

hep-ph↗

arXiv2016

Baryogenesis from leptomesons

Various new physics models, e.g., theories of compositeness, can accommodate the color singlet excited leptons that interact with the leptons, quarks, leptoquarks, etc. A particular type of excited lepton, which at low energies interacts with the Standard Model fermions mainly through the four-fermion coupling to lepton and quark-antiquark (or lepton-antilepton) pair, we call leptomeson. These new particles may contribute to variety of the experimental anomalies such as the discrepancy in the muon g-2. We propose that the leptomesons can generate also the baryon asymmetry that explains the imbalance in ordinary matter and antimatter in the observable universe. We consider the two types of scenarios for this baryogenesis via leptogenesis to occur from either leptomeson oscillations or decays. Both possibilities do not contradict to the small masses of the observable neutrinos and the proton stability. Moreover they can be relevant for the near future collider experiments and do not suffer from the gravitino problem.

hep-ph↗

arXiv2016

Earth Matter Effect on Democratic Neutrinos

The neutrino propagation through the Earth is investigated in the framework of the democratic neutrino theory. In this theory the neutrino mixing angle theta-1-3 is approximately determined, which allows one to make a well defined neutrino oscillogram driven by the 1-3 mixing in the matter of the Earth. Significant differences in this oscillogram from the case of models with relatively small theta-1-3 are discussed.

hep-ph↗

arXiv2016

Leptomeson contribution to the muon g-2

Many models on the market allow for particles carrying both lepton number and color, e.g., leptoquarks and leptogluons. Some of the models with this feature can also accommodate color-singlet leptohadrons. We have found that the long-standing discrepancy between the experimental result and the Standard Model prediction for the muon anomalous magnetic moment can be explained by the effect of leptomesons within the wide allowed range of their masses and couplings. These new particles are testable at the current run of the LHC.

hep-ph↗

arXiv2015

Leptogluons in dilepton production at LHC

In the composite models with colored substructure of the fermions the color singlet leptons are accompanied by a composite color octet partners, which are known as leptogluons. We consider the effect of leptogluons in the dilepton production at the LHC and show that in the reachable parameter range this effect is typically dominated by t-channel leptogluon exchange (indirect channel). We show that this channel alone can give a sizable contribution to the dimuon production at the LHC for TeV scale values of the invariant mass of the muon-antimuon pairs.

hep-ph↗

arXiv2014

Neutrino Democratic Masses, Mixing and Incoherence

It is shown that the well established and confirmed neutrino experimental results, such as atmospheric neutrino oscillations and solar neutrino deficit, can be easily explained for "democratic" left-handed Majorana neutrinos, taking into account the effect of incoherence. In this model the absolute values of the neutrino masses can be extracted from the atmospheric neutrino oscillation data, which gives the mass spectrum close to {0.03 eV, 0.03 eV, 0.06 eV}. The predictions of the considered model and its further testing are discussed.

hep-ph↗

arXiv2014

Democratic Neutrino Theory

New theory of neutrino masses and mixing is introduced. This theory is based on a simple S_3 symmetric democratic neutrino mass matrix, and predicts the neutrino mass spectrum of normal ordering. Taking into account the matter effect and proper averaging of the oscillations, this theory agrees with the variety of atmospheric, solar and accelerator neutrino data. Moreover, the absolute scale of the neutrino masses m of 0.03 eV is determined in this theory, using the atmospheric neutrino oscillation data. In case of tiny perturbations in the democratic mass matrix only one this scale parameter m allows to explain the mentioned above neutrino results, and the theory has huge predictive power.

hep-ph↗

arXiv2014

New Results on Neutrino Magnetic Moments and on Democratic Neutrinos

I discuss the two separate issues on neutrino physics. First, the new bounds on tensorial couplings of neutrinos to charged fermions from the existing limits on neutrino transition magnetic moments. Second, explanation of the atmospheric and solar neutrino data in the democratic neutrino theory with only one free parameter (in the leading order), using the effect of incoherence.

hep-ph↗

arXiv2014

Nonstandard neutrino interactions and transition magnetic moments

We constrain generic nonstandard neutrino interactions with existing experimental data on neutrino transition magnetic moments and derive strong bounds on tensorial couplings of neutrinos to charged fermions. We also discuss how some of these tensorial couplings can be constrained by other experiments, e.g., on neutrino-electron and neutrino-nucleus scattering.

hep-ph↗

arXiv2013

Reality of Manned Flying Reactor

New concept for reducing dose radiation exposure, which helps to decrease the duration and cost of deep space human missions is introduced. This concept can be efficiently realized, using modern materials, such as carbon nanotube composites.

physics.space-ph↗

arXiv2012

Secret of Neutrino Oscillations

The new effect of partial and full destruction of the neutrino oscillation pattern due to the neutrino wave packets separation in the transverse plane to the direction of the neutrino propagation is investigated. It is shown that this effect is significant in the real oscillation data, in particular, for the solar neutrinos, and dramatically changes the extracted physical properties of neutrinos.

hep-ph↗

arXiv2011

New Solution for Neutrino Masses and Leptogenesis in Adjoint SU(5)

We investigate baryogenesis via leptogenesis and generation of neutrino masses and mixings through the Type I plus Type III seesaw plus an one-loop mechanism in the context of Renormalizable Adjoint SU(5) theory. One light neutrino remains massless, because the contributions of three heavy Majorana fermions ρ_0, ρ_3 and ρ_8 to the neutrino mass matrix are not linearly independent. However none of these heavy fermions is decoupled from the generation of neutrino masses. This opens a new range in parameter space for successful leptogenesis, in particular, allows for inverted hierarchy of the neutrino masses.

hep-ph↗

arXiv2011

Minimal Flavour Violation with hierarchical squark masses

In a supersymmetric model with hierarchical squark masses we analyze a pattern of flavour symmetry breaking centered on the special role of the top Yukawa coupling and, by extension, of the full Yukawa couplings for the up-type quarks. For sufficiently heavy squarks of the first and second generation this leads to effective Minimal Flavour Violation of the Flavour Changing Neutral Current amplitudes. For this to happen we determine the bounds on the masses of the heavy squarks with QCD corrections taken into account, properly including previously neglected effects. We believe that the view presented in this paper altogether strengthens the case for hierarchical sfermions.

hep-ph↗