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11 papers · 2 filters
Search for a Theta++ Pentaquark State
H. G. Juengst
Recent reports about the Theta+ (formerly known as Z+), a pentaquark state, have awakened considerable interest. We report our findings in search of a Theta++ state over a wide ran…
Helicity-Dependent Angular Distributions in Double-Charged-Pion Photoproduction
S. Strauch
Two-pion photoproduction in the reaction gamma + p -> p + pi^+ + pi^- has been studied at Jefferson Lab Hall B using a circularly-polarized tagged photon beam in the energy range b…
Medium Modification of the Proton Form Factor
S. Strauch
I argue that the double ratio of proton-recoil polarization-transfer coefficients, P'_x and P'_z, of the quasielastic 4He(e,e'p)3H reaction with respect to the elastic 1H(e,e'p) re…
Two-Nucleon Momentum Distributions Measured in 3He(e,e'pp)n
CLAS Collaboration, R. A. Niyazov, L. B. Weinstein
We have measured the 3He(e,e'pp)n reaction at 2.2 GeV over a wide kinematic range. The kinetic energy distribution for `fast' nucleons (p > 250 MeV/c) peaks where two nucleons each…
Does the Sigma(1580)3/2- resonance exist?
Crystal Ball Collaboration, J. Olmsted, S. Prakhov +34
Precise new data for the reaction are presented in the c.m. energy range 1565 to 1600 MeV. Our analysis of these data sheds new light on claims for the $Σ(1580){3…
Study of polarized-e polarized-p --> e-prime p pi0 in the Delta(1232) mass region using polarization asymmetries
A. Biselli
Measurements of the angular distributions of target and double spin asymmetries for the Delta(1232) in the exclusive channel (polarized-p polarized-e,e-prime p)pi0 obtained at Jeff…