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Photoproduction of Charged Pi Mesons from Hydrogen and Deuterium

Jenkins, T.L. ; Luckey, D. ; Palfrey, T.R. ; et al.

Phys.Rev. 95 (1954) 179-184, 1954.

Inspire Record 944932 DOI 10.17182/hepdata.26426

Photoproduction cross sections of charged pi mesons from hydrogen and deuterium have been measured as a function of meson angle at gamma-ray energies of 200, 235, and 265 Mev. The angular range extends from 30° to 180° in the laboratory system. Absolute cross sections have been determined. A least-squares fit of the measured cross sections has been made to the expression A+Bcosθ+Csin2θ, which assumes only S and P wave scattering. The coefficients so determined are qualitatively consistent with electric and magnetic dipole absorption together with the assumption of a resonant state of angular momentum 32 and of energy close to 300 Mev. Comparison with neutral meson production indicates some direct charged meson production in the P state.

2 data tables

Table 1

No description provided.

Table 2

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Elastic scattering of pi mesons on protons in the energy region 550 to 1020 Mev

Wood, Calvin D ;

UCRL-9507, 1961.

Inspire Record 896412 DOI 10.17182/hepdata.18596

None

5 data tables

Table 1

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Table 2

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Table 3

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K--p and K--n Cross Sections in the Momentum Range 1-4 Bev/c

Cook, V. ; Cork, Bruce ; Hoang, T.F. ; et al.

Phys.Rev. 123 (1961) 320-332, 1961.

Inspire Record 46822 DOI 10.17182/hepdata.26808

The energy dependence of the K−-nucleon total cross sections has been measured over the K− momentum range 0.98-3.98 Bev/c. K−−n cross sections were obtained by deuterium-hydrogen subtraction, with a correction for screening effects. There is evidence for structure in the T=0 K−-nucleon state in the momentum range 0.98-2.0 Bev/c. This structure is absent in the T=1 state. In addition, a measurement was made at 1.95 Bev/c of the angular distribution of the K−−p elastic scattering at small angles. The forward-scattering amplitude obtained from the data gives a ratio of real part to imaginary part 0.5±0.2 at 00. The corresponding ratio for π− mesons at this momentum was found to be 0.4−0.4+0.2. Measurements of the K−−p "elastic" charge exchange gives a cross section which falls from about 10 mb at 1 Bev/c to at most a few mb at 4 Bev/c.

1 data table

Table 1

No description provided.

Production of Pion Resonances in pi+ p Interactions.

Alff-Steinberger, C. ; Berley, D. ; Colley, D. ;

Phys.Rev.Lett. 9 (1962) 322, 1962.

Inspire Record 48453 DOI 10.17182/hepdata.19352

None

1 data table

Table 1

No description provided.

Multiple Meson Production in Proton-Proton Collisions at 2.85 Bev

Hart, E.L. ; Louttit, R.I. ; Luers, D. ; et al.

Phys.Rev. 126 (1962) 747-756, 1962.

Inspire Record 47769 DOI 10.17182/hepdata.26782

Measurements have been made on 753 four-prong events obtained by exposing the Brookhaven National Laboratory 20-in. liquid hydrogen bubble chamber to 2.85-Bev protons. The partial cross sections observed for multiple meson production reactions are: pp+−(p+p→p+p+π++π−), 2.67±0.13; pn++−, 1.15±0.09; pp+−0, 0.74±0.07; d++−, 0.06±0.02; four or more meson production, 0.04±0.02, all in mb. Production of two mesons appears to occur mainly in peripheral collisions with relatively little momentum transfer. In cases of three-meson production, however, the protons are typically deflected at large angles and are more strongly degraded in energy. The 32, 32 pion-nucleon resonance dominates the interaction; there is some indication that one or both of the T=12, pion-nucleon resonances also play a part. The recently discovered resonance in a T=0, three-pion state appears to be present in the pp+−0 reaction. Results are compared with the predictions of the isobaric nucleon model of Sternheimer and Lindenbaum, and with the statistical model of Cerulus and Hagedorn. The cross section for the reaction π0+p→π++π−+p is derived using an expression from the one-pion exchange model of Drell.

1 data table

Table 1

No description provided.

Photoproduction of $K^+$ mesons in hydrogen

Anderson, R.L. ; Gabathuler, E. ; Jones, D. ; et al.

Phys.Rev.Lett. 9 (1962) 131-133, 1962.

Inspire Record 44754 DOI 10.17182/hepdata.19407

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

The $\pi^- p$ reaction around the $\Lambda^0 K^0$ threshold

Crittenden, R.R. ; Martin, H.J. ; Musgrave, B. ;

116-123, 1963.

Inspire Record 1407768 DOI 10.17182/hepdata.70311

None

1 data table

Table 1

No description provided.

Elastic-Differential Cross Section of pi++p at 1.5, 2.0, and 2.5 BeV/c

Cook, Victor ; Cork, Bruce ; Holley, William R. ; et al.

Phys.Rev. 130 (1963) 762-765, 1963.

Inspire Record 944975 DOI 10.17182/hepdata.599

We measured elastic-scattering angular distributions for π++p scattering at 1.5, 2.0, and 2.5 BeV/c using spark chambers to detect scattered pions and protons. A bump that decreases in amplitude with increasing momentum is observed in the backward hemisphere in the 1.5- and 2.0-BeV/c distributions, but is not observed in the 2.5-BeV/c distributions. It appears reasonable to attribute this phenomenon to the 1.45-BeV/c resonance observed in the π++p total cross section. The data are compared with π−+p data and are found to support the theoretical prediction that the scattering cross sections for both charge states should become equal at high energies. We fit the angular distributions with a power series in cosθ*, and compare the extrapolated values for the scattering cross section in the backward direction with the calculation of the neutron-exchange pole contribution to the cross section. The "elementary" neutron-pole term contribution is calculated to be 90 mb/sr at 2.0 BeV/c, in violent disagreement with the extrapolated value, ≈0.5 mb/sr.

4 data tables

Table 1

No description provided.

Table 2

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Table 3

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