J. Lichtenstadt
A5038515679- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Crystallography and Radiation Phenomena
- Nuclear reactor physics and engineering
- Magnetic confinement fusion research
- Astro and Planetary Science
- Scientific Research and Discoveries
Tel Aviv University
2010-2024
Campbell Collaboration
2023
A. Alikhanyan National Laboratory
2023
University of Aveiro
2021-2023
Jožef Stefan Institute
2021
Israel Academy of Sciences and Humanities
1984-2010
University of Bonn
2007
Fermi National Accelerator Laboratory
1996-1999
University of Trieste
1994-1997
Uppsala University
1994-1997
The proton elastic form factors ${\mathit{G}}_{\mathit{E}\mathit{p}}$(${\mathit{Q}}^{2}$) and ${\mathit{G}}_{\mathit{M}\mathit{p}}$(${\mathit{Q}}^{2}$) have been extracted for ${\mathit{Q}}^{2}$=1.75 to 8.83 (GeV/c${)}^{2}$ via a Rosenbluth separation ep cross section measurements in the angular range 13\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}\ensuremath{\theta}\ensuremath{\le}90\ifmmode^\circ\else\textdegree\fi{}. ${\mathit{Q}}^{2}$ covered more than doubles that of existing...
We present the final results of spin asymmetries A1 and structure functions g1 proton deuteron in kinematic range 0.0008<x<0.7 0.2<Q2<100GeV2. For determination A1, addition to usual method which employs inclusive scattering events includes a large radiative background at low x, we use new minimizes by selecting with least one hadron as well muon state. find that this gives smaller errors for x<0.02, so it is combined provide optimal set results.Received 18 May...
Quasielastic e-d cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain ${\mathit{R}}_{\mathit{L}}$ ${\mathit{R}}_{\mathit{T}}$ ${\mathit{Q}}^{2}$=1.75, 2.50, 3.25, 4.00 (GeV/c${)}^{2}$. The neutron form factors ${\mathit{G}}_{\mathit{E}\mathit{n}}$ ${\mathit{G}}_{\mathit{M}\mathit{n}}$ extracted using a nonrelativistic model. sensitivity deuteron wave function, relativistic corrections, models of the inelastic background are reported....
We report the first measurement using a solid polarized target of neutron electric form factor G(n)(E) via d-->(e-->,e(')n)p. was determined from beam-target asymmetry in scattering longitudinally electrons deuterated ammonia ( 15ND3). The performed Hall C at Thomas Jefferson National Accelerator Facility quasifree kinematics with polarization perpendicular to momentum transfer. were detected magnetic spectrometer coincidence neutrons large angle segmented detector. find =...
We present a new measurement of the spin-dependent structure function g1d deuteron in deep inelastic scattering 190 GeV polarised muons on deuterons, kinematic range 0.003 < x 0.7 and 1 GeV2 Q2 60 GeV2. This is found to be negative at small x. The first moment Γ1d=∫01g1ddx evaluated Q02 = 10 0.034 ± 0.009 (stat.) 0.006 (syst.). value below Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination Γ1p, we obtain Γ1p − Γ1n 0.199 0.038 which agrees with Bjorken rule.
We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering polarised muons on protons deuterons in the range 0.003<x<0.7 Q2>1 GeV2. Compared to our previous publication this subject, with new data statistical errors have been reduced by nearly factor two. From these inclusive we determine quark distributions valence quarks non-strange sea at Q2=10 The u distribution, Δuv(x), is positive polarisation increases x. d...
The electric form factor of the neutron was determined from measurements $\stackrel{\ensuremath{\rightarrow}}{d}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)p$ reaction for quasielastic kinematics. Polarized electrons were scattered off a polarized deuterated ammonia ($^{15}\mathrm{N}\mathrm{D}_{3}$) target in which deuteron polarization perpendicular to momentum transfer. detected magnetic spectrometer coincidence with neutrons large solid angle detector. We find...
We measured the energies, widths, and cross sections of isovector monopole dipole resonances in various nuclei between $^{40}\mathrm{Ca}$ $^{208}\mathrm{Pb}$ with reactions (${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$,${\ensuremath{\pi}}^{0}$). Both exhaust approximately same substantial fraction section calculated a random-phase-approximation--distorted-wave-impulse-approximation model. The excitation energies widths are good agreement random-phase-approximation calculations for...
The deuteron magnetic form factor B(${Q}^{2}$) has been measured at momentum transfers ${Q}^{2}$=1.21, 1.49, 1.61, 1.74, 1.98, 2.23, 2.48, 2.53, and 2.77 (GeV/c${)}^{2}$ the Stanford Linear Accelerator Center by detection of electrons backscattered 180\ifmmode^\circ\else\textdegree\fi{} in coincidence with recoiling deuterons 0\ifmmode^\circ\else\textdegree\fi{}. data for are found to decrease rapidly from ${Q}^{2}$=1.2 2 (GeV/c${)}^{2}$, then rise a secondary maximum around ${Q}^{2}$=2.5...
We present a next-to-leading order QCD analysis of the presently available data on spin structure function g1 including final from Spin Muon Collaboration. results for first moments proton, deuteron, and neutron functions, determine singlet nonsinglet parton distributions in two factorization schemes. also test Bjorken sum rule find agreement with theoretical prediction at level 10%.Received 18 May 1998DOI:https://doi.org/10.1103/PhysRevD.58.112002©1998 American Physical Society
We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in final state. Two methods event classification are used to increase contribution photon-gluon fusion process above 30%. The most effective one, based on neural network approach, provides asymmetries Al→NlhhXp=0.030±0.057(stat)±0.010(syst) and Al→NlhhXd=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon...
We present the first direct measurements of pion valence-quark momentum distribution which is related to square light-cone wave function. The were carried out using data on diffractive dissociation $500\mathrm{GeV}/c$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ into dijets from a platinum target at Fermilab experiment E791. results show that $|q\overline{q}〉$ asymptotic function describes well for ${Q}^{2}\ensuremath{\sim}10(\mathrm{GeV}/c{)}^{2}$ or more. also measured transverse dijets.
We present a new measurement of the spin-dependent structure function g1d deuteron from deep inelastic scattering 190 GeV polarized muons on deuterons. The results are combined with our previous measurements g1d. A perturbative QCD evolution in next-to-leading order is used to compute g1d(x) at constant Q2. At Q2 = 10 GeV2, we obtain first moment Γ1d=∫1dg1ddx=0.041±0.008, flavour-singlet axial charge nucleon a0 0.30 ± 0.08, and an strange quark as −0.09 0.03. Using earlier determination Γ1p,...
We measured the spin asymmetry in scattering of 100 GeV longitudinally-polarized muons on transversely polarized protons. The was found to be compatible with zero kinematic range 0.006 < x 0.6, 1 Q2 30GeV2. From this result we derive upper limits for virtual photon-proton A2, and structure function g2. For 0.15, A2 is significantly smaller than its positivity limit √R.
Measurements of the deuteron elastic magnetic structure function B(${\mathit{Q}}^{2}$) are reported at squared four-momentum transfer values 1.20\ensuremath{\le}${\mathit{Q}}^{2}$\ensuremath{\le}2.77 (GeV/c${)}^{2}$. Also for proton form factor ${\mathit{G}}_{\mathit{M}\mathit{p}}$(${\mathit{Q}}^{2}$) 11 ${\mathit{Q}}^{2}$ between 0.49 and 1.75 The data were obtained using an electron beam 0.5 to 1.3 GeV. Electrons backscattered near 180\ifmmode^\circ\else\textdegree\fi{} detected in...
We have studied the diffractive dissociation into dijets of 500 GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where t(min)-->0), we find that when per-nucleus cross section for this process is parametrized as sigma = sigma0Aalpha, alpha has values near 1.6, exact result depending on jet transverse momentum. These are in agreement with those predicted by theoretical calculations color-transparency.
We present the results of spin asymmetries ${A}_{1}$ proton and deuteron in kinematic region extending down to $x=6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ ${Q}^{2}=0.01{\mathrm{GeV}}^{2}.$ The data were taken with a dedicated low x trigger, which required hadron detection addition scattered muon, so as reduce background at x. complement our previous measurements two sets are consistent overlap region. No significant effects found newly explored
We present a new measurement of the virtual photon proton asymmetry A1p from deep inelastic scattering polarized muons on protons in kinematic range 0.0008 < x 0.7 and 0.2 Q2 100 GeV2. With this, statistical uncertainty our has improved by factor 2 compared to previous measurements. The spin-dependent structure function g1p is determined for data with > 1 A perturbative QCD evolution next-to-leading order used determine g1p(x) at constant Q2. At = 10 GeV2 we find, measured range,...
The ratio of the proton's electric to magnetic form factor, ${G}_{E}/{G}_{M}$, can be extracted in elastic electron-proton scattering by measuring cross sections, beam-target asymmetry, or recoil polarization. Separate determinations ${G}_{E}/{G}_{M}$ sections and polarization observables disagree for ${Q}^{2}>1$ (GeV/$c){}^{2}$. Measurement a third technique might uncover an unknown systematic error either previous measurements. asymmetry has been measured at ${Q}^{2}$ = 1.51...