A5054234610- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Particle Accelerators and Free-Electron Lasers
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Nonlinear Photonic Systems
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Nonlinear Waves and Solitons
- Astrophysics and Cosmic Phenomena
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Advanced Chemical Physics Studies
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
Boston University
2020-2023
Budker Institute of Nuclear Physics
2010-2017
Russian Academy of Sciences
2014-2015
Novosibirsk State University
2014
Siberian Branch of the Russian Academy of Sciences
2012-2014
Novosibirsk State Technical University
2008-2009
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
Numerous theories extending beyond the standard model of particle physics predict existence bosons that could constitute dark matter (DM) permeating universe. In halo (SHM) galactic velocity distribution bosonic DM field defines a characteristic coherence time $\tau_c$. Until recently, laboratory experiments searching for fields have been in regime where measurement $T$ significantly exceeds $\tau_c$, so null results interpreted as constraints on coupling to particles with amplitude $\Phi_0$...
The ratio of the elastic ${e}^{+}p$ to ${e}^{\ensuremath{-}}p$ scattering cross sections has been measured precisely, allowing determination two-photon exchange contribution these processes. This neglected is believed be cause discrepancy between Rosenbluth and polarization transfer methods measuring proton electromagnetic form factors. experiment was performed at VEPP-3 storage ring beam energies 1.6 1.0 GeV lepton angles 15\ifmmode^\circ\else\textdegree\fi{}...
We report the results of an experimental search for ultralight axion-like dark matter in mass range 162 neV to 166 neV. The detection scheme our Cosmic Axion Spin Precession Experiment (CASPEr) is based on a precision measurement $^{207}$Pb solid-state nuclear magnetic resonance polarized ferroelectric crystal. Axion-like can exert oscillating torque spins via electric-dipole moment coupling $g_d$, or gradient $g_{\text{aNN}}$. calibrated detector and characterized excitation spectrum...
We derive spectral line shapes of the expected signal for a haloscope experiment searching axionlike dark matter. The knowledge these is needed to optimize an experimental design and data analysis procedure. extend previously known results axion-photon axion-gluon couplings case gradient (axion-fermion) coupling. A unique feature interaction its dependence not only on magnitudes but also directions velocities galactic halo particles, which leads directional sensitivity corresponding...
This paper describes a new multipurpose event generator, ESEPP, which has been developed for the Monte Carlo simulation of unpolarized elastic scattering charged leptons on protons. The generator takes into account lowest-order QED radiative corrections to Rosenbluth cross section including first-order bremsstrahlung without using soft-photon or ultrarelativistic approximations. ESEPP can be useful several significant ongoing and planned experiments.
Ultralight bosonic dark matter (UBDM) can be described by a classical wave-like field oscillating near the Compton frequency of bosons. If measurement scheme for direct detection UBDM interactions is sensitive to signature quadratic in field, then there near-zero-frequency (dc) component signal. Thus, detector with given finite bandwidth used search bosons frequencies many orders magnitude larger than its bandwidth. This opens possibility analogous Hanbury Brown and Twiss intensity...
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q^{2}) up to 15.75 (GeV/c)^{2}. Combined with existing data, these provide an improved extraction proton magnetic form factor at high Q^{2} and double range over which a longitudinal or transverse separation can be performed. The difference between our results polarization data agrees that observed lower attributed hard two-photon exchange (TPE) effects, extending 8...
We present a reanalysis of the data from Stanford Linear Accelerator Center (SLAC) experiments E140 [R. C. Walker et al., Phys. Rev. D 49, 5671 (1994)] and NE11 [L. Andivahis 50, 5491 on elastic electron-proton scattering. This work is motivated by recent progress in calculating corresponding radiative corrections apparent discrepancy between Rosenbluth polarization transfer measurements proton electromagnetic form factors. New, corrected values for scattering cross sections are presented,...
Nuclear magnetic resonance is a promising experimental approach to search for ultra-light axion-like dark matter. Searches such as the cosmic axion spin-precession experiments (CASPEr) are ultimately limited by quantum-mechanical noise sources, in particular, spin-projection noise. We discuss how fundamental limits can potentially be reached. consider circuit model of experiment and quantify three sources: noise, thermal amplifier Calculation total spectrum takes into account modification...
A puzzling discrepancy exists between the values of proton charge radius obtained using different experimental techniques: elastic electron-proton scattering and spectroscopy electronic muonic hydrogen. The is defined through slope electric form factor, $G_E(Q^2)$, at zero four-momentum transfer, which inaccessible in experiments. We propose a novel method for extracting from data over broad $Q^2$ range rather than attempting to directly determine $G_E$ $Q^2 = 0$. This relates its transverse...
Linear time evolution is one of the fundamental postulates quantum theory. Past theoretical attempts to introduce nonlinearity into have violated causality. However, a recent theory has introduced nonlinear state-dependent terms in field theory, preserving causality [D. E. Kaplan and S. Rajendran, Phys. Rev. D 105, 055002 (2022)PRVDAQ2470-001010.1103/PhysRevD.105.055002]. We report results an experiment that searches for such terms. Our approach, inspired by Everett many-worlds...
We give an overview of the activity in studying photoprocesses on a tensor-polarized deuterium target, which is carried out at VEPP–3 electron storage ring. Recent experimental results tensor asymmetries two-body deuteron photodisintegration photon energy up to 500 MeV, and coherent pion photoproduction are presented. Plans upgrade facility future experiments discussed. Further progress connected with installation tagging system for almost-real photons. This would allow us extend...
New manifestly gauge-invariant forms of two-dimensional generalized dispersive long-wave and Nizhnik-Veselov-Novikov systems integrable nonlinear equations are presented. It is shown how in different gauges from such famous generalization system equations, modified other known new arise. Miura-type transformations between considered.
We describe a precise measurement of the ratio (e+ p) to (e− elastic scattering cross sections. This comparison is sensitive effect two-photon exchange contributions which may be cause for inconsistent extractions proton form factors obtained using different methods. The experiment was performed at storage ring VEPP–3, Novosibirsk energies positron/electron beams 1.0 and 1.6 GeV with electron/positron angles θ = 65÷105° first case 15÷25° 55÷75° second case. Details preliminary results are presented.