HEPData Search

Detailed measurements of the production of charged π mesons in proton-proton collisions are reported. The observed results are compared with the "isobar" and "one-pion exchange" models and for single production are in agreement if only the "resonant" part of the π−p cross section is used and if the angular distribution cos16θ is introduced for the production of the N1* isobar. The effects of higher resonances are also considered.

4 data tables

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Antiproton-Proton and Proton-Proton Total Cross Sections from 4 to 20 Bev/c

Lindenbaum, S.J. ; Love, W.A. ; Niederer, J.A. ; et al.

Phys.Rev.Lett. 7 (1961) 185-188, 1961.

Inspire Record 944907 DOI 10.17182/hepdata.191

None

2 data tables

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Total p-p and 'p-n' Cross Sections at Cosmotron Energies

Chen, Francis F. ; Leavitt, Christopher P. ; Shapiro, Anatole M. ;

Phys.Rev. 103 (1956) 211-225, 1956.

Inspire Record 46809 DOI 10.17182/hepdata.828

The total proton-proton cross section (excluding Coulomb scattering) has been measured at energies from 410 Mev up to 2.6 Bev, using external beams from the Cosmotron. Fast counting equipment was used to measure the attenuation of the beams through polyethylene, carbon, and liquid H2 absorbers. At each energy E, σp−p(E, Ω) was measured as a function of the solid angle Ω subtended by the rear counter at the center of the absorber. The total cross section σp−p was obtained by a least squares straight line extrapolation to Ω=0. The measured σp−p as a function of energy rises sharply from 26.5 mb at 410 Mev to 47.8 mb at 830 Mev and then remains approximately constant out to 1.4 Bev, above which energy it decreases gradually to about 42 mb at 2.6 Bev. Using the same equipment and procedure, we have also measured the D2O-H2O difference cross section, called "σp−n," for protons over the same energy range. From a comparison of "σp−n," and σp−p, with the n−p and n−d measurements of Coor et al. at 1.4 Bev, it is apparent that one nucleon is "shielded" by the other in the deuteron. This effect is not present at energies below 410 Mev. Comparing the measured p−p and "p−n" (corrected) cross sections with the results of other high-energy experiments, one may infer the following conclusions: (1) The sharp rise in σp−p from 400 to 800 Mev results from increasing single pion production, which may proceed through the T=32, J=32 excited nucleon state. (2) Above 1 Bev the inelastic (meson production) p−p cross section appears to be approximately saturated at 27-29 mb. (3) The rise in cross section for n−p interaction in the T=0 state, associated with the rise in double pion production, implies that double meson production also proceeds through the T=32 nucleon state. (4) The probable equality of σp−d and σn−d at 1.4 Bev implies the validity of charge symmetry at this energy.

4 data tables

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Electron-Proton Scattering at High Momentum Transfers

Small-Angle Elastic Scattering of Protons and Pions, 7-20 BeV/c

Electron-Proton Elastic Scattering at 1 and 4 BeV

Antiproton and Kaon Elastic Scattering at High Energies

pi-Meson Production in 2.9-BeV p-p Collisions

Antiproton-Proton and Proton-Proton Total Cross Sections from 4 to 20 Bev/c

Total p-p and 'p-n' Cross Sections at Cosmotron Energies