10 research outputs found

    Tensor Polarization of the phi meson Photoproduced at High t

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    As part of a measurement of the cross section of ϕ\phi meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing K+K^+ in the channel ϕK+K\phi \to K^+K^- in the ϕ\phi center-of-mass frame (the helicity frame). We find that s-channel helicity conservation (SCHC) holds in the kinematical range where tt-channel exchange dominates (up to t2.5-t \sim 2.5 GeV2^2 for EγE_{\gamma}=3.6 GeV). Above this momentum, uu-channel production of a ϕ\phi meson dominates and induces a violation of SCHC. The deduced value of the ϕNN\phi NN coupling constant lies in the upper range of previously reported values.Comment: 6 pages; 5 figure

    Erratum - First measurement of the double spin asymmetry in (e)over-right-arrow(p)over-right-arrow -> e 'pi(+)n in the resonance region

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    First measurement of transferred polarization in the exclusive epeK+Λ\vec e p \rightarrow e'K^+\vec \Lambda reaction

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    First measurement of the double spin asymmetry in epeπ+n\vec e\vec p \rightarrow e'\pi^+ n in the resonance region

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    First measurement of transferred polarization in the exclusive epeK+Λ\vec e p \rightarrow e'K^+\vec \Lambda reaction

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    Complete angular distribution measurements of two-body deuteron photodisintegration between 0.5 and 3 GeV

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    Nearly complete angular distributions of the two-body deuteron photodisintegration differential cross section have been measured using the CEBAF Large Acceptance Spectrometer detector and the tagged photon beam at the Thomas Jefferson National Accelerator Facility. The data cover photon energies between 0.5 and 3.0 GeV and center-of-mass proton scattering angles 10degrees-160degrees. The data show a persistent forward- backward angle asymmetry over the explored energy range, and are well described by the nonperturbative quark gluon string model

    Two nucleon momentum distributions measured in 3^3He (e,epp)n(e,e'pp)n

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    Two nucleon momentum distributions measured in 3^3He (e,epp)n(e,e'pp)n

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    First measurement of the double spin asymmetry in (e)over- right-arrow(p)over-right-arrow → e 'pi(+) in the resonance region

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    The double spin asymmetry in the (e) over right arrow(p) over right arrow → e' pi(+) n reaction has been measured for the first time in the resonance region for four-momentum transfer Q(2) = 0.35-1.5 GeV2. 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 phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A(1) for the F-15(1680) resonance than expected from the analysis of the unpolarized data

    Measurement of ep\rightarrowe'pπ+π\pi^+\pi^-and baryon resonance analysis

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