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Photoproduction cross sections for $\pi^+$ and $K^+$ mesons at 3.4 to 4.0 {GeV} and their comparison with {SU(3)}

Elings, V.B. ; Cohen, K.J. ; Garelick, D.A. ; et al.

Phys.Rev. 156 (1967) 1433-1443, 1967.

Inspire Record 51624 DOI 10.17182/hepdata.406

The differential cross sections for the photoproduction reactions γ+p→π++n, γ+p→K++Λ0, and γ+p→K++Σ0 have ben measured for incident laboratory photon energies between 3.4 and 4.0 GeV and for meson center-of-mass angles from about 25° to 45°. The reactions were studied by observing only the charged mesons. The momenta, velocities, and angles of the mesons were measured with a magnetic spectrometer, and the equivalent of nearly monochromatic gamma rays was obtained by performing bremsstrahlung subtractions. The cross sections agree with the inequality predicted from unbroken SU(3). The measured behavior of dσdt as a function of t shows similarities to that observed in studies of mesonnucleon scattering.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Total Hadronic Photoabsorption Cross-Sections on Hydrogen and Complex Nuclei from 4-GeV to 18-GeV

Caldwell, David O. ; Elings, V.B. ; Hesse, W.P. ; et al.

Phys.Rev.D 7 (1973) 1362, 1973.

Inspire Record 83727 DOI 10.17182/hepdata.22181

Final total cross sections are given for a counter experiment at SLAC on hadronic photon absorption in hydrogen, deuterium, carbon, copper, and lead at incident energies from 3.7 to 18.3 GeV. Some of the nucleon cross sections have been revised and the C, Cu, and Pb data from 3.7 to 7.4 GeV have not been reported previously. The cross sections for complex nuclei vary approximately as A0.9 in our energy range, indicating that the photon interacts, at least partially, as a strongly interacting particle. The energy dependences of the proton and neutron cross sections are also similar to those of hadron-nucleon cross sections and hence may be fitted by a typical Regge parametrization, yielding σT(γp)=(98.7±3.6)+(65.0±10.1)ν−12 μb and σT(γn)=(103.4±6.7)+(33.1±19.4)ν−12 μb, where ν is the photon energy in GeV. These extrapolate to the same value at infinite energy, consistent with Pomeranchukon exchange, and the energy-dependent part yields an isovector-to-isoscalar-exchange ratio of 0.18 ± 0.06. While these observations are qualitatively consistent with vector meson dominance, quantitatively vector dominance fails in relating our results to ρ photo-production on hydrogen or to experiments determining the ρ-nucleon cross section. Vector dominance cannot be rescued by assuming that the ρ-photon coupling constant depends on the photon mass. Instead, an additional short-range interaction is apparently required, possibly due to a heavy (≳ 2 GeV / c2) vector meson or to a bare-photon interaction. The additional interaction accounts for approximately 20% of the total photoabsorption cross section.

3 data tables

Table 1

DATA ARE GROUPED IN SETS OF FOUR TAGGING ENERGIES FOR EACH INCIDENT POSITRON ENERGY.

Table 2

CROSS SECTIONS FOR EACH INCIDENT POSITRON ENERGY AVERAGED OVER THE FOUR TAGGING ENERGIES.

Table 3

TOTAL CROSS SECTION, EFFECTIVE NUCLEON NUMBER (A-EFF) AND EFFECTIVE ATTENUATION (A-EFF/A) FOR CARBON, COPPER AND LEAD TARGETS. 'SIG(NUCLEON)' IS THE AVERAGE NUCLEON CROSS SECTION.

pi- C-12 Interactions at E(pi) = 40-GeV and the Hypothesis About Hadron Clusters

Inogamova, T.Ya. ; Kalinkin, B.N. ; Lyubimov, V.B. ; et al.

Sov.J.Nucl.Phys. 22 (1975) 291, 1975.

Inspire Record 91364 DOI 10.17182/hepdata.19081

None

1 data table

Table 1

No description provided.

Study of pi- n and pi- C-12 Interactions Involving Strange Particles at the Momentum of 40-GeV/c

Angelov, N. ; Vishnevskaya, K.P. ; Grishin, V.G. ; et al.

Yad.Fiz. 24 (1976) 732-741, 1976.

Inspire Record 100544 DOI 10.17182/hepdata.18228

None

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Resonance Production in pi- n Interactions at 5-GeV (Four Particle Final States)

Amaglobeli, N.S. ; Budagov, Yu.A. ; Vinogradov, V.B. ; et al.

Yad.Fiz. 23 (1976) 378-382, 1976.

Inspire Record 112763 DOI 10.17182/hepdata.19076

None

1 data table

Table 1

CORRESPONDING PI+ P CROSS SECTIONS QUOTED. SECONDARY INTERACTIONS OF RHO0 AND DEL- WITH INTRANUCLEAR NUCLEONS SUPPRESSES SIG COMPARED WITH PI+ P DATA.