HEPData Search

Showing 5 of 2105 results

HIGH-ENERGY PHOTOMESON PRODUCTION FROM HYDROGEN VIA THE 'u CHANNEL'

Anderson, Robert L. ; Gustavson, D. ; Johnson, J.R. ; et al.

Phys.Rev.Lett. 21 (1968) 479-481, 1968.

Inspire Record 52639 DOI 10.17182/hepdata.21700

We have investigated the photoproduction process γ+p→π++n over a wide range of energies and u values at the Stanford Linear Accelerator Center (SLAC) accelerator. We also have investigated γ+p→π−+N*++ at one value of u and γ+p→K++Λ0, Σ0 at one u value and three energies. Our results for dσdu for the photoproduction of π+ mesons from hydrogen are roughly α2π of the corresponding cross sections for the elastic scattering of π− mesons from hydrogen. The u dependence of our cross sections is not dominated by nucleon exchange as it is in the case of π+p elastic scattering.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Polarization of Recoil Protons from Neutral Pion Photoproduction

Lundquist, D.E. ; Anderson, R.L. ; Allaby, J.V. ; et al.

Phys.Rev. 168 (1968) 1527-1533, 1968.

Inspire Record 54507 DOI 10.17182/hepdata.26510

The polarization of recoiling protons from the photoproduction of π0 mesons on liquid hydrogen has been measured for primary photon energies between 500 and 1000 MeV over a range of π0 c.m. angles from 55° to 130°. The results show structure not observed previously in experiments of less precision. In particular, the polarization at 90° c.m. is close to zero at a primary photon energy of 900 MeV. Also, a strong dependence of polarization on π0 c.m. angle between 600 and 900 MeV was observed. A subsidiary measurement of the polarization of the recoil protons from elastic e−p scattering at 900 MeV and q2=10 F−2 gave a value (1.3±2.0)%.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Positron-Proton Elastic Scattering at 800 and 1200 MeV

Anderson, R.L. ; Borgia, B. ; Cassiday, G.L. ; et al.

Phys.Rev. 166 (1968) 1336-1342, 1968.

Inspire Record 944943 DOI 10.17182/hepdata.26527

The cross section for the elastic scattering of positrons from protons has been compared with the corresponding electron cross section using secondary beams derived from the photon beam of the Cornell 2-GeV synchrotron. The paths of the scattered leptons (positrons or electrons) and recoil protons were recorded in spark chambers and were used to determine the incident lepton energy of each event. Elastic scatterings were identified by requiring coplanarity and a fit to the scattering kinematics. The detection system was sensitive to scattering angles between 25° and 75°. The ratio of the positron cross section to the corresponding electron cross section was 0.992±0.017 at 800 MeV and 0.987±0.019 at 1200 MeV. No significant variation of the ratio with angle of scattering was found.

2 data tables

Table 1

No description provided.

Table 2

No description provided.