A. Berdnikov
A5065278498- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Nuclear Physics and Applications
- Stochastic processes and statistical mechanics
- Quantum, superfluid, helium dynamics
- Pediatric Urology and Nephrology Studies
- High-pressure geophysics and materials
- Statistical Methods and Bayesian Inference
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Gas Dynamics and Kinetic Theory
- Radiation Therapy and Dosimetry
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Markov Chains and Monte Carlo Methods
- Radioactive Decay and Measurement Techniques
Peter the Great St. Petersburg Polytechnic University
2015-2024
Banaras Hindu University
2016-2024
Augustana University
2016-2024
Bhabha Atomic Research Centre
2018-2024
PHENIX laboratory
2016-2023
Abilene Christian University
2018-2023
Charles University
2016-2023
Kurchatov Institute
2020-2023
Petersburg Nuclear Physics Institute
2022
Brookhaven National Laboratory
2018
Flow coefficients v_n for n = 2, 3, 4, characterizing the anisotropic collective flow in Au+Au collisions at sqrt(s_NN) 200 GeV, are measured relative to event planes \Psi_n determined large rapidity. We report as a function of transverse momentum and collision centrality, study correlations among different order n. The well described by hydrodynamic models which employ Glauber Monte Carlo initial state geometry with fluctuations, providing additional constraining power on interplay between...
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured invariant differential cross section for production of ${K}_{S}^{0}$, $\ensuremath{\omega}$, ${\ensuremath{\eta}}^{\ensuremath{'}}$, and $\ensuremath{\phi}$ mesons in $p+p$ collisions $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$. Measurements $\ensuremath{\omega}$ different decay channels give consistent results. New results are agreement with previously published data extend ${p}_{T}$ coverage. spectral shapes all...
The second Fourier component ${v}_{2}$ of the azimuthal anisotropy with respect to reaction plane is measured for direct photons at midrapidity and transverse momentum (${p}_{T}$) $1--12\text{ }\text{ }\mathrm{GeV}/c$ in $\mathrm{Au}+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\mathrm{GeV}$. Previous measurements this quantity hadrons ${p}_{T}<6\text{ indicate that medium behaves like a nearly perfect fluid, while ${p}_{T}>6\text{ reduced interpreted terms path-length dependence...
Transverse momentum distributions and yields for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, $\mathrm{p\ifmmode \bar{}\else \={}\fi{}}$ in $p+p$ collisions at $\sqrt{s}$ $=$ 200 62.4 GeV midrapidity are measured by the PHENIX experiment Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra comparisons with identified particle heavy ion RHIC. We present inverse slope parameter ${T}_{\mathrm{inv}}$, mean...
Heavy quarkonia are observed to be suppressed in relativistic heavy-ion collisions relative their production $p+p$ scaled by the number of binary collisions. In order determine if this suppression is related color screening these states produced medium, one needs account for other nuclear modifications including those cold matter. paper, we present new measurements from PHENIX 2007 data set $J/\ensuremath{\psi}$ yields at forward rapidity ($1.2<|y|<2.2$) $\text{Au}+\text{Au}$...
We present the first measurement of elliptic (v2) and triangular (v3) flow in high-multiplicity 3He+Au collisions at √sNN=200 GeV. Two-particle correlations, where particles have a large separation pseudorapidity, are compared p+p indicate that collective effects dominate second third Fourier components for correlations observed system. The behavior is quantified terms v2 v3 anisotropy coefficients measured with respect to their corresponding event planes. values comparable those previously...
Direct photons produced in relativistic heavy-ion collisions allow access to the state of matter during collision, because they do not experience strong interaction and can escape from fireball without scattering. New data PHENIX experiment at RHIC show that as a function impact parameter yield direct increases much more rapidly than particle production, which provides new evidence for emission system when it was most hot dense.
The PHENIX experiment has measured the production of ${\ensuremath{\pi}}^{0}$s in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}$ $=$ 200 GeV. new data offer a fourfold increase recorded luminosity, providing higher precision and larger reach transverse momentum, ${p}_{T}$, to 20 GeV/$c$. ratio $\ensuremath{\eta}/{\ensuremath{\pi}}^{0}$ is $0.46\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst})$, constant with ${p}_{T}$ collision...
The transverse momentum (${p}_{T}$) spectra and ratios of identified charged hadrons (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, $\overline{p}$) produced in $\sqrt{{s}_{{}_{NN}}}=200$ GeV $\mathrm{Au}+\mathrm{Au}$ $d+\text{Au}$ collisions are reported five different centrality classes for each collision species. measurements pions protons up to ${p}_{T}=6$ GeV/$c$ (5 GeV/$c$), the kaons ${p}_{T}=4$ (3.5 GeV/$c$) ($d+\text{Au}$) collisions....
A bstract Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These can, among other things, explain origin neutrino masses, generate observed matter-antimatter asymmetry in Universe and provide a dark matter candidate. The SHiP experiment will be able to search for HNLs produced decays heavy mesons travelling distances ranging between $$ \mathcal{O} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi>...
Back-to-back hadron pair yields in d+Au and p+p collisions at sqrt(s_NN)=200 GeV were measured with the PHENIX detector Relativistic Heavy Ion Collider. Rapidity separated pairs detected trigger pseudorapidity |eta|<0.35 associated forward rapidity (deuteron direction, 3.0<eta<3.8). Pairs also both hadrons rapidity; this case yield of back-to-back small impact parameters is observed to be suppressed by a factor 10 relative collisions. The kinematics these expected probe partons Au nucleus...
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured 2nd and 3rd order Fourier coefficients of azimuthal distributions direct photons emitted midrapidity in Au$+$Au collisions $\sqrt{s_{_{NN}}}=200$ GeV for various collision centralities. Combining two different analysis techniques, results were obtained transverse momentum range $0.4
Measurements of midrapidity charged-particle multiplicity distributions, $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$, and transverse-energy $d{E}_{T}/d\ensuremath{\eta}$, are presented for a variety collision systems energies. Included distributions $\mathrm{Au}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, 7.7 GeV, $\mathrm{Cu}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}\mathrm{Cu}$...
We have measured the azimuthal anisotropy of pi0's for 1 < pT 18 GeV/c Au+Au collisions at sqrt s_NN = 200 GeV. The observed shows a gradual decrease in 3 7 - 10 GeV/c, but remains positive beyond GeV/c. magnitude this is under-predicted, up to least by current perturbative QCD (pQCD) energy-loss model calculations. An estimate increase expected from initial-geometry modification due gluon saturation effects and fluctuations insufficient account discrepancy. Calculations which implement path...
We present measurements of $J/\ensuremath{\psi}$ yields in $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ recorded by the PHENIX experiment and compare them with $p+p$ same energy per nucleon-nucleon collision. The cover a large kinematic range rapidity ($\ensuremath{-}2.2<y<2.4$) high statistical precision are compared two theoretical models: one nuclear shadowing combined final state breakup coherent gluon saturation effects. In order to remove model...
The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has performed systematic measurements of phi meson production in K+K- decay channel midrapidity p+p, d+Au, Cu+Cu and Au+Au collisions sqrt(S_NN)=200 GeV. Results are presented on invariant yield nuclear modification factor R_AA for Cu+Cu, R_dA d+Au collisions, studied as a function transverse momentum (1<p_T<7 GeV/c) centrality. In central mid-central exhibits suppression relative to expectations from binary scaled p+p...
The PHENIX experiment presents results from the RHIC 2006 run with polarized $p+p$ collisions at $\sqrt{s}=62.4\text{ }\text{ }\mathrm{GeV}$, for inclusive ${\ensuremath{\pi}}^{0}$ production midrapidity. Unpolarized cross section are measured transverse momenta ${p}_{T}=0.5$ to $7\text{ }\mathrm{GeV}/c$. Next-to-leading order perturbative quantum chromodynamics calculations compared data, and while consistent measurements, next-to-leading logarithmic corrections improve agreement. Double...
Differential measurements of the elliptic (v_2) and hexadecapole (v_4) Fourier flow coefficients are reported for charged hadrons as a function transverse momentum (p_T) collision centrality or number participant nucleons (N_part) Au+Au collisions at sqrt(s_NN)=200 GeV. The v_{2,4} pseudorapidity |\eta|<=0.35 obtained with four separate reaction plane detectors positioned in range 1.0<|\eta|<3.9 show good agreement, indicating absence significant \eta-dependent nonflow perturbations. Sizable...
We report on charmonium measurements [$J/\ensuremath{\psi}$ (1S), ${\ensuremath{\psi}}^{\ensuremath{'}}$ (2S), and ${\ensuremath{\chi}}_{c}$ (1P)] in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$. find that the fraction of $J/\ensuremath{\psi}$ coming from feed-down decay midrapidity region ($|y|<0.35$) is $9.6\ifmmode\pm\else\textpm\fi{}2.4%$ $32\ifmmode\pm\else\textpm\fi{}9%$, respectively. also present ${p}_{T}$ rapidity dependencies yield measured via dielectron dimuon...
The momentum distribution of electrons from semileptonic decays charm and bottom quarks for midrapidity $|y|<0.35$ in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ is measured by the PHENIX experiment Relativistic Heavy Ion Collider over transverse range $2<{p}_{T}<7\text{ }\mathrm{GeV}/c$. ratio yield to that presented. determined using partial $D/\overline{D}\ensuremath{\rightarrow}{e}^{\ifmmode\pm\else\textpm\fi{}}{K}^{\ensuremath{\mp}}X$ ($K$ unidentified)...
The PHENIX experiment has measured electrons and positrons at midrapidity from the decays of hadrons containing charm bottom quarks produced in d+Au p+p collisions sqrt(s_NN)=200 GeV Relativistic Heavy Ion Collider, transverse-momentum range 0.85 < pT 8.5 GeV/c. In central collisions, nuclear modification factor R_dA 1.5 5 GeV/c displays evidence enhancement these electrons, relative to those shows that mass-dependent Cronin observed RHIC extends heavy-D-meson family. A comparison with...
Measurements of transverse-single-spin asymmetries (${A}_{N}$) in $p+p$ collisions at $\sqrt{s}=62.4$ and 200 GeV with the PHENIX detector Relativistic Heavy Ion Collider are presented. At midrapidity, ${A}_{N}$ is measured for neutral pion eta mesons reconstructed from diphoton decay, and, forward rapidities, pions using both diphotons electromagnetic clusters. The neutral-pion measurement midrapidity consistent zero uncertainties a factor 20 smaller than previous publications, which will...