P . V . Degtyarenko

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In an exclusive measurement of the reaction gammad-->K(+)K(-)pn, a narrow peak that can be attributed to an exotic baryon with strangeness S=+1 is seen in the K(+)n invariant mass spectrum. The peak is at 1.542+/-0.005 GeV/c(2) with a measured width of 0.021 GeV/c(2) FWHM, which is largely determined by experimental mass resolution. The statistical(More)
The reaction gamma p-->pi(+)K(-)K(+)n was studied at Jefferson Laboratory using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass M=1555+/-10 MeV/c(2) was observed in the nK(+) invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c(2)), and its statistical(More)
P. E. Bosted,35,* R. Fersch,39 G. Adams,31 M. Amarian,29 S. Anefalos,17 M. Anghinolfi,18 G. Asryan,40 H. Avakian,17,35 H. Bagdasaryan,29,40 N. Baillie,39 J. P. Ball,2 N. A. Baltzell,34 S. Barrow,13 V. Batourine,35 M. Battaglieri,18 K. Beard,21 I. Bedlinskiy,20 M. Bektasoglu,29 M. Bellis,5,31 N. Benmouna,14 A. S. Biselli,11 B. E. Bonner,32 S. Bouchigny,19,35(More)
Beam-helicity asymmetries for the two-pion-photoproduction reaction gammap-->ppi(+)pi(-) have been studied for the first time in the resonance region for center-of-mass energies between 1.35 and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an(More)
The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of(More)
I. Hleiqawi,1 K. Hicks,1 D. S. Carman,1,32 T. Mibe,1 G. Niculescu,20 A. Tkabladze,13 M. Amarian,26 P. Ambrozewicz,11 M. Anghinolfi,17 G. Asryan,37 H. Avakian,32 H. Bagdasaryan,26 N. Baillie,36 J. P. Ball,2 N. A. Baltzell,31 V. Batourine,21 M. Battaglieri,17 K. Beard,20 I. Bedlinskiy,19 M. Bellis,4 N. Benmouna,13 B. L. Berman,13 A. S. Biselli,4 S.(More)
The longitudinal target-spin asymmetry AUL for the exclusive electroproduction of high-energy photons was measured for the first time in ep-->e;'pgamma. The data have been accumulated at JLab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH3 target. A significant azimuthal angular dependence was observed, resulting from(More)
We investigate the transition from the nucleon-meson to the quark-gluon description of the strong interaction using the photon energy dependence of the d(gamma,p)n differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between 30 degrees and 150 degrees. A possible signature for this transition is the onset of(More)
The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic(More)
Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 with a statistical accuracy of a few percent. The scaling power for the s dependence of the cross section at fixed center-of-mass angle was found to be 8.0+/-0.2, strongly inconsistent with the prediction of perturbative(More)