Affolder, T.
Inclusive
DSIG/DOMEGA
[1.0, 2.0]
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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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CHARGE NUMBER DEPENDENCE OF PI+ PRODUCTION FROM NUCLEI BY 200-MEV ELECTRON

Shoda, K. ; Toyama, S. ; Torikoshi, M. ; et al.
Nucl.Phys.A 486 (1988) 512-525, 1988.
Inspire Record 270173 DOI 10.17182/hepdata.37011

Photopion energy distributions have been measured on 7 Li , 28 Si , 51 V and 93 Nb at θ π = 90° with 200 MeV electron. The logarithmic plot of the distributions shows a break at around 10 MeV of the residual energy. This is not explained by the quasi-free π + production. The (e, π + ) cross sections at θ π = 90° deduced by integrating the energy distribution. The result can be approximated by σ 0 Z 2 3 , where σ 0 is 0.13 times the elementary cross section of H(e, π + ) at θ π = 90°. The quasi-free π + production calculated by the Fermi-gas model with Pauli exclusion principle approximately reproduces the relative dependence on the charge number but its absolute value is about ten times as large as the experimental result. The present result for the charged photopion cross section in the threshold region is in contrast to the case in the Δ-resonance region where the cross section of π + + π − photoproduction is expressed by A 2 3 times the elementary cross sections.

1 data table
Table 1

No description provided.


REACTION ANTI-P C-12 ---> ANTI-N X AT 590-MEV/C

Nakamura, K. ; Fujii, T. ; Kageyama, T. ; et al.
Phys.Rev.C 31 (1985) 1853-1856, 1985.
Inspire Record 220552 DOI 10.17182/hepdata.26214

The antineutron angular distribution in the reaction p¯C→n¯X was measured at 590 MeV/c. The shape of the distribution is found to be similar to that of the elementary process p¯p→n¯n, which indicates that the quasi-free process is the dominant mechanism for p¯C→n¯X. The antineutron production cross section per bound proton in the carbon nucleus is 0.14 times that for a free proton.

2 data tables
Table 1

No description provided.

Table 2

No description provided.