HEPData Search

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Measurement of cross-section for gamma gamma ---> p anti-p

The CLEO collaboration Artuso, M. ; He, D. ; Goldberg, M. ; et al.

Phys.Rev.D 50 (1994) 5484-5490, 1994.

Inspire Record 358510 DOI 10.17182/hepdata.47137

A measurement of the cross section for γγ→pp¯ is performed at two-photon center-of-mass energies between 2.00 and 3.25 GeV. These results are obtained using e+e−→e+e−pp¯ events selected from 1.31 fb−1 of data taken with the CLEO II detector. The measured cross section is in reasonable agreement with previous measurements and is in excellent agreement with recent calculations based on a diquark model. However, leading order QCD calculations performed using the Brodsky-Lepage formalism are well below the measured cross section.

3 data tables

Table 1

Data read from graph.

Table 2

Data read from graph.

Table 3

Data read from graph.

Measurements of the electric and magnetic form-factors of the neutron from Q2 = 1.75-GeV/c2 to 4-GeV/c**2

Lung, A. ; Stuart, L.M. ; Bosted, Peter E. ; et al.

Phys.Rev.Lett. 70 (1993) 718-721, 1993.

Inspire Record 342252 DOI 10.17182/hepdata.19739

Quasielastic e-d cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain RL and RT at Q2=1.75, 2.50, 3.25, and 4.00 (GeV/c)2. The neutron form factors GEn and GMn have been extracted using a nonrelativistic model. The sensitivity to deuteron wave function, relativistic corrections, and models of the inelastic background are reported. The results for GMn are consistent with the dipole form, while GEn is consistent with zero. Comparisons are made to theoretical models based on vector meson dominance, perturbative QCD, and QCD sum rules, as well as constituent quarks.

2 data tables

Table 1

Magnetic form factors.

Table 2

Electric form factors.