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Radiative decays of theΣ0(1385)andΛ(1520)hyperons
Taylor, S.,Mutchler, G. S.,Adams, G.,Ambrozewicz, P.,Anciant, E.,Anghinolfi, M.,Asavapibhop, B.,Asryan, G.,Audit, G.,Avakian, H.,Bagdasaryan, H.,Ball, J. P.,Barrow, S.,Batourine, V.,Battaglieri, M.,Be American Physical Society 2005 PHYSICAL REVIEW C - Vol.71 No.5
Dharmawardane, K.V.,Kuhn, S.E.,Bosted, P.,Prok, Y.,Adams, G.,Ambrozewicz, P.,Anghinolfi, M.,Asryan, G.,Avakian, H.,Bagdasaryan, H.,Baillie, N.,Ball, J.P.,Baltzell, N.A.,Barrow, S.,Batourine, V.,Battag Elsevier 2006 Physics letters: B Vol.641 No.1
<P><B>Abstract</B></P><P>We report results for the virtual photon asymmetry <SUB>A1</SUB> on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton (NH315) and deuteron (ND315) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present Letter, we concentrate on our results for <SUB>A1</SUB>(x,<SUP>Q2</SUP>) and the related ratio <SUB>g1</SUB>/<SUB>F1</SUB>(x,<SUP>Q2</SUP>) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer <SUP>Q2</SUP> from 0.05 to 5.0<SUP>(GeV/c)2</SUP> and in final-state invariant mass <I>W</I> up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong <SUP>Q2</SUP>-dependence of <SUB>A1</SUB>(x,<SUP>Q2</SUP>) for <I>W</I> below 2 GeV. At higher <I>W</I>, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but <SUB>A1</SUB>(x,<SUP>Q2</SUP>) is not strictly <SUP>Q2</SUP>-independent. We add significantly to the world data set at high <I>x</I>, up to x=0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative <I>d</I>-quark polarization up to our highest <I>x</I>. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.</P>
Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS
Mayer, M.,Kuhn, S. E.,Adhikari, K. P.,Akbar, Z.,Anefalos Pereira, S.,Asryan, G.,Avakian, H.,Badui, R. A.,Ball, J.,Baltzell, N. A.,Battaglieri, M.,Bedlinskiy, I.,Biselli, A. S.,Boiarinov, S.,Bosted, P. American Physical Society 2017 Physical Review C Vol.95 No.2
<P>Conclusions: Final-state interactions seem to play a lesser role for polarization observables in deuteron two-body electrodisintegration than for absolute cross sections. Our data, while limited in statistical power, indicate that PWIA models work reasonably well to understand the asymmetries at lower missing momenta. In turn, this information can be used to extract the product of beam and target polarization (PbPt) from quasielastic electron-deuteron scattering, which is useful for measurements of spin observables in electron-neutron inelastic scattering. However, at the highest missing (neutron) momenta, FSI effects become important and must be accounted for.</P>
Measurement of semi-inclusiveπ+electroproduction off the proton
Osipenko, M.,Ripani, M.,Ricco, G.,Avakian, H.,De Vita, R.,Adams, G.,Amaryan, M. J.,Ambrozewicz, P.,Anghinolfi, M.,Asryan, G.,Bagdasaryan, H.,Baillie, N.,Ball, J. P.,Baltzell, N. A.,Barrow, S.,Battagli American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.3
Moments of the spin structure functions g1p and g1d for 0.05<<sup>Q2</sup><3.0<sup> GeV2</sup>
Prok, Y.,Bosted, P.,Burkert, V.D.,Deur, A.,Dharmawardane, K.V.,Dodge, G.E.,Griffioen, K.A.,Kuhn, S.E.,Minehart, R.,Adams, G.,Amaryan, M.J.,Anghinolfi, M.,Asryan, G.,Audit, G.,Avakian, H.,Bagdasaryan, Elsevier 2009 Physics letters: B Vol.672 No.1
<P><B>Abstract</B></P><P>The spin structure functions <SUB>g1</SUB> for the proton and the deuteron have been measured over a wide kinematic range in <I>x</I> and <SUP>Q2</SUP> using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH<SUB>3</SUB> and ND<SUB>3</SUB> targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05<<SUP>Q2</SUP><5<SUP> GeV2</SUP> and W<3 GeV. The first moments of <SUB>g1</SUB> for the proton and deuteron are presented – both have a negative slope at low <SUP>Q2</SUP>, as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong <SUP>Q2</SUP> dependence at low <SUP>Q2</SUP>. Our analysis of the <SUP>Q2</SUP> evolution of the first moment of <SUB>g1</SUB> shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest <SUP>Q2</SUP>.</P>
Bosted, P. E.,Biselli, A. S.,Careccia, S.,Dodge, G.,Fersch, R.,Guler, N.,Kuhn, S. E.,Pierce, J.,Prok, Y.,Zheng, X.,Adhikari, K. P.,Adikaram, D.,Akbar, Z.,Amaryan, M. J.,Anefalos Pereira, S.,Asryan, G. American Physical Society 2016 Physical Review C Vol.94 No.5
<P>Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive pi(+) and quasiexclusive pi(-) electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for pi(+)) and deuterons (for pi(-)) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q(2) < 5 GeV2, with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for pi(+) from free protons and 15 000 bins for pi(-) production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for W < 1.7 GeV and Q(2) < 0.5 GeV2, with discrepancies increasing at higher values of Q(2), especially for W > 1.5 GeV. Very large target-spin asymmetries are observed for W > 1.6 GeV. When combined with cross-section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.3 GeV.</P>