A5049252748- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Electron and X-Ray Spectroscopy Techniques
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Markov Chains and Monte Carlo Methods
- Advanced Chemical Physics Studies
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Statistical Methods and Bayesian Inference
University of Virginia
2017-2024
Stony Brook University
2015-2024
State University of New York
2021-2024
Williams (United States)
2024
Thomas Jefferson National Accelerator Facility
2024
William & Mary
2024
Charles University
2020-2023
Banaras Hindu University
2018-2023
PHENIX laboratory
2020-2023
Kurchatov Institute
2023
We report a precision measurement of the parity-violating asymmetry $A_{PV}$ in elastic scattering longitudinally polarized electrons from $^{208}$Pb. measure $A_{PV}=550\pm 16 {\rm (stat)}\pm 8\ (syst)}$ parts per billion, leading to an extraction neutral weak form factor $F_W(Q^2 = 0.00616\ GeV}^2) 0.368 \pm 0.013$. Combined with our previous measurement, extracted neutron skin thickness is $R_n-R_p=0.283 0.071$~fm. The result also yields first significant direct interior density...
We report a precise measurement of the parity-violating (PV) asymmetry A_{PV} in elastic scattering longitudinally polarized electrons from ^{48}Ca. measure A_{PV}=2668±106(stat)±40(syst) parts per billion, leading to an extraction neutral weak form factor F_{W}(q=0.8733 fm^{-1})=0.1304±0.0052(stat)±0.0020(syst) and charge minus F_{ch}-F_{W}=0.0277±0.0055. The resulting neutron skin thickness R_{n}-R_{p}=0.121±0.026(exp)±0.024(model) fm is relatively thin yet consistent with many model...
The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high transfer is presented. These data, taken with the H1 detector HERA, are corrected for effects using an unbinned machine learning algorithm (multifold), which considers eight observables simultaneously this application. unfolded cross sections compared calculations performed within context collinear or transverse-momentum-dependent factorization quantum chromodynamics as well...
The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by MARATHON experiment from measurements deep inelastic scattering electrons ^{3}H and ^{3}He nuclei. was performed in Hall A Facility Jefferson Lab using two high-resolution spectrometers for electron detection, a cryogenic target system which included low-activity tritium cell. data analysis used novel technique exploiting mirror symmetry nuclei, essentially eliminates many theoretical uncertainties...
In this document the PHENIX collaboration proposes a major upgrade to detector at Relativistic Heavy Ion Collider. This upgrade, sPHENIX, enables an extremely rich jet and beauty quarkonia physics program addressing fundamental questions about nature of strongly coupled quark-gluon plasma (QGP), discovered experimentally RHIC be perfect fluid. The startling dynamics QGP on fluid-like length scales is emergent property quantum chromodynamics (QCD), seemingly implicit in Lagrangian but...
Results are presented from data recorded in 2009 by the PHENIX experiment at Relativistic Heavy Ion Collider for double-longitudinal spin asymmetry, $A_{LL}$, $\pi^0$ and $\eta$ production $\sqrt{s} = 200$ GeV polarized $p$$+$$p$ collisions. Comparison of results with different theory expectations based on fits other published showed a preference small positive values gluon polarization, $\Delta G$, proton probed Bjorken $x$ range. The effect adding new \pz to recent global analysis...
We present the first measurements of long-range angular correlations and transverse momentum dependence elliptic flow $v_2$ in high-multiplicity $p$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. A comparison these results with previous $d$$+$Au $^3{\rm He}$$+$Au demonstrates a relation between initial collision eccentricity $\varepsilon_2$, suggesting that observed momentum-space azimuthal anisotropies small systems have collective origin reflect geometry. Good agreement is measured...
Asymmetric nuclear collisions of $p+\mathrm{Al}$, $p+\mathrm{Au}$, $d+\mathrm{Au}$, and $^{3}\mathrm{He}+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ provide an excellent laboratory for understanding particle production, as well exploring interactions among these particles after their initial creation in the collision. We present measurements charged hadron production $d{N}_{\text{ch}}/d\ensuremath{\eta}$ all such collision systems over a broad pseudorapidity range...
Abstract Charged particle multiplicity distributions in positron-proton deep inelastic scattering at a centre-of-mass energy $$\sqrt{s}=319$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>319</mml:mn> </mml:mrow> </mml:math> GeV are measured. The data collected with the H1 detector HERA corresponding to an integrated luminosity of 136 pb $$^{-1}$$ <mml:msup> <mml:mrow /> <mml:mo>-</mml:mo>...
We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values Bjorken variable x_{B}. DVCS is sensitive to generalized parton distributions nucleon, which provide a three-dimensional description its internal constituents. Using exact analytic expression for all possible polarization states initial and final electron state photon, we present first experimental extraction four helicity-conserving form factors (CFFs) nucleon as function...
The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy-flavor production in minimum bias Au$+$Au collisions $\sqrt{s_{_{NN}}}=200$ GeV via yields of electrons from semileptonic decays charm and bottom hadrons. Previous electron measurements indicated substantial modification momentum distribution parent heavy quarks due to quark-gluon plasma created these collisions. For first time, using silicon vertex detector measure precision displaced tracking, relative...
The PHENIX Collaboration has measured the ratio of yields $\ensuremath{\psi}(2S)$ to $\ensuremath{\psi}(1S)$ mesons produced in $p+p$, $p+\mathrm{Al}$, $p+\mathrm{Au}$, and $^{3}\mathrm{He}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV over forward backward rapidity intervals $1.2<|y|<2.2$. We find that $p+p$ is consistent with measurements other collision energies. In nuclei, we ($p$-going or $^{3}\mathrm{He}$-going) direction, relative yield value collisions. However,...
Abstract The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. final stage is presented, a next-to-next-to-leading-order (NNLO) analysis the HERA data on inclusive deep inelastic ep scattering together with jet as published by H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously $$\alpha _s(M_Z^2)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub>...
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 report precision determinations of the beam-normal single spin asymmetries (A_{n}) in elastic scattering 0.95 and 2.18 GeV electrons off ^{12}C, ^{40}Ca, ^{48}Ca, ^{208}Pb at very forward angles where most detailed theoretical calculations have been performed. The first measurements A_{n} for ^{40}Ca ^{48}Ca are found to be similar that consistent with expectations thus demonstrating validity nuclei Z≤20. also two new momentum transfers (Q^{2}) extending previous measurement. Our data...
The PHENIX experiment reports systematic measurements at the Relativistic Heavy Ion Collider of ϕ-meson production in asymmetric Cu+Au collisions sNN=200GeV and U+U sNN=193GeV. Measurements were performed via ϕ→K+K− decay channel midrapidity |η|<0.35. Features measured Cu+Cu, Cu+Au, Au+Au, found to not depend on collision geometry, which was expected because yields are averaged over azimuthal angle follow scaling with nuclear-overlap size. elliptic flow ϕ meson scales...
The radiation pattern within high energy quark- and gluon-initiated jets (jet substructure) is used extensively as a precision probe of the strong force well an environment for optimizing event generators with numerous applications in particle nuclear physics. Looking at electron-proton collisions particular interest many complications present hadron colliders are absent. A detailed study modern jet substructure observables, angularities, presented using data recorded H1 detector HERA....
Abstract The Breit frame provides a natural to analyze lepton–proton scattering events. In this reference frame, the parton model hard interactions between quark and an exchanged boson defines coordinate system such that struck is back-scattered along virtual photon momentum direction. Quantum Chromodynamics (QCD), higher order perturbative or non-perturbative effects can change picture drastically. As Bjorken- x decreases below one half, rather peculiar event signature predicted with...
We report the first measurement of (e,e′p) three-body breakup reaction cross sections in helium-3 (3He) and tritium (3H) at large momentum transfer [⟨Q2⟩≈1.9 (GeV/c)2] xB>1 kinematics, where section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤pmiss≤500 MeV/c that, QE limit with no rescattering, equals initial probed nucleon. measured are compared state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is...