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Full-Text Articles in Physics
Deeply Virtual Compton Scattering Off The Neutron, M. Mazouz, Timothy Holmstrom, Jefferson Lab Hall A Collaboration
Deeply Virtual Compton Scattering Off The Neutron, M. Mazouz, Timothy Holmstrom, Jefferson Lab Hall A Collaboration
Chemistry & Physics Faculty Publications
The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e⃗,e′γ)X cross section measured at Q2=1.9 GeV2 and xB=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to Eq, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.
Investigation Of Proton-Proton Short-Range Correlations Via The (12)C(E,E′Pp) Reaction, R. Shneor, Timothy Holmstrom, Jefferson Hall Lab A Collaboration
Investigation Of Proton-Proton Short-Range Correlations Via The (12)C(E,E′Pp) Reaction, R. Shneor, Timothy Holmstrom, Jefferson Hall Lab A Collaboration
Chemistry & Physics Faculty Publications
We investigated simultaneously the 12C(e,e′p) and 12C(e,e′pp) reactions at Q2=2 (GeV/c)2, xB=1.2, and in an (e, e′p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing momentum greater than the Fermi momentum of nucleons in a nucleus and far from the delta excitation, short-range nucleon-nucleon correlations are predicted to dominate the reaction. For (9.5±2)% of the 12C(e,e′p) events, a recoiling partner proton was observed back-to-back to the 12C(e,e′p) missing-momentum vector, an experimental signature of correlations.
Search For Σ(5)(0), N(5)(0), And Θ++ Pentaquark States, Y. Qiang, Timothy Holmstrom, Jefferson Lab Hall Collaboration
Search For Σ(5)(0), N(5)(0), And Θ++ Pentaquark States, Y. Qiang, Timothy Holmstrom, Jefferson Lab Hall Collaboration
Chemistry & Physics Faculty Publications
A high-resolution (σinstr.=1.5 MeV) search for narrow states (ΓMeV) with masses of Mx≈1500–1850 MeV in ep→e′K+X,e′K-X, and e′π+X electroproduction at small angles and low Q2 was performed. These states would be candidate partner states of the reported Θ+(1540) pentaquark. No statistically significant signal was observed in any of the channels at 90% C.L. Upper limits on forward production were determined to be between 0.8% and 4.9% of the Λ(1520) production cross section, depending on the channel and the assumed mass and …