Baker, S.L.
DSIG/DOMEGA
[1.676]
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$\pi^+$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV

The CLAS collaboration Dugger, M. ; Ritchie, B.G. ; Ball, J.P. ; et al.
Phys.Rev.C 79 (2009) 065206, 2009.
Inspire Record 814847 DOI 10.17182/hepdata.51952

Differential cross sections for the reaction $\gamma p \to n \pi^+$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.725 to 2.875 GeV. Where available, the results obtained here compare well with previously published results for the reaction. Agreement with the SAID and MAID analyses is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been made up to 2.7 GeV. Resonance couplings have been extracted and compared to previous determinations. With the addition of these cross sections to the world data set, significant changes have occurred in the high-energy behavior of the SAID cross-section predictions and amplitudes.

11 data tables
Table 1

Differential cross sections for incident photon energies 0.725, 0.775, 0.825and 0.875 GeV.

Table 2

Differential cross sections for incident photon energies 0.925, 0.975, 1.025and 1.075 GeV.

Table 3

Differential cross sections for incident photon energies 1.125, 1.175, 1.225and 1.275 GeV.

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Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer

Dalton, M.M. ; Adams, G.S. ; Ahmidouch, A. ; et al.
Phys.Rev.C 80 (2009) 015205, 2009.
Inspire Record 783943 DOI 10.17182/hepdata.50548

The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. This quantity appears to begin scaling as 1/Q3, a predicted signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

39 data tables
Table 1

Total cross section for the lower Q**2 data as a function of W. The errors are statistics and systematic added in quadrature.

Table 2

Total cross section for the higher Q**2 data as a function of W. The errors are statistics and systematic added in quadrature.

Table 3

Lower Q**2 extracted differential cross section at W = 1.500 GeV and cos(theta(eta) = -0.917, -0.750 and -0.583.

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Separated structure functions for the exclusive electroproduction of K+ Lambda and K+ Sigma0 final states.

The CLAS collaboration Ambrozewicz, P. ; Carman, D.S. ; Feuerbach, R.J. ; et al.
Phys.Rev.C 75 (2007) 045203, 2007.
Inspire Record 732363 DOI 10.17182/hepdata.4994

We report measurements of the exclusive electroproduction of $K^+\Lambda$ and $K^+\Sigma^0$ final states from a proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions $\sigma_T$, $\sigma_L$, $\sigma_{TT}$, and $\sigma_{LT}$ were extracted from the $\Phi$- and $\epsilon$-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first $\sigma_L/\sigma_T$ separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from $0.5\leq Q^2\leq 2.8$ GeV$^2$ and invariant energy from $1.6\leq W\leq 2.4$ GeV, while spanning nearly the full center-of-mass angular range of the kaon. The separated structure functions reveal clear differences between the production dynamics for the $\Lambda$ and $\Sigma^0$ hyperons. These results provide an unprecedented data sample with which to constrain current and future models for the associated production of strangeness, which will allow for a better understanding of the underlying resonant and non-resonant contributions to hyperon production.

531 data tables
Table 1

Cross sections for incident energy 2.567 GeV for the Q**2 range 0.5 to 0.8 GeV**2 and W range 1.6 to 1.7 GeV.

Table 2

Cross sections for incident energy 2.567 GeV for the Q**2 range 0.5 to 0.8 GeV**2 and W range 1.70 to 1.75 GeV.

Table 3

Cross sections for incident energy 2.567 GeV for the Q**2 range 0.5 to 0.8 GeV**2 and W range 1.75 to 1.80 GeV.

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The Reaction $\pi^- p \to K^0 \Lambda^0$ Up to 1334-{MeV}/$c$

Baker, R.D. ; Blissett, J.A. ; Bloodworth, I.J. ; et al.
Nucl.Phys.B 141 (1978) 29-47, 1978.
Inspire Record 130523 DOI 10.17182/hepdata.34954

New data on differential cross sections and polarisation are presented at nine incident momenta up to 1334 MeV/ c . An energy-dependent phase-shift analysis has been made and resonance parameters are given.

21 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Positive pion - proton elastic scattering at 895-MeV/c, 945-MeV c, 995-MeV/c, and 1040-MeV/c

Baker, S.L. ; Dornan, P.J. ; Gopal, G.P. ; et al.
Nucl.Phys.B 18 (1970) 29-44, 1970.
Inspire Record 63038 DOI 10.17182/hepdata.7920

The differential cross section for π + p elastic scattering at 895, 945, 995 and 1040 MeV/ c has been measured in a hydrogen bubble chamber. The results are in good agreement with previous measurements using counter techniques except at extreme backward angles where significantly lower cross sections are obtained.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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