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HIGH-ENERGY pi0 PHOTOPRODUCTION FROM HYDROGEN WITH UNPOLARIZED AND LINEARLY POLARIZED PHOTONS

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

Phys.Rev.D 4 (1971) 1937, 1971.

Inspire Record 67154 DOI 10.17182/hepdata.25066

We have completed measurements of the differential cross section for γ+p→π0+p, and the asymmetry with polarized photons, for incident photon energies from 4 to 18 GeV and momentum transfers between t=−0.1 and −1.4 (GeV/c)2. The experiment was performed at the Stanford Linear Accelerator Center, using the SLAC 1.6-GeV/c spectrometer to analyze protons recoiling from a hydrogen target. For the cross-section measurements a normal collimated bremsstrahlung beam was used. For the asymmetry measurements the polarized photons were produced by coherent bremsstrahlung from a diamond crystal, and a coincidence was required between the recoil proton and one of the π0 decay photons in a shower counter.

7 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Inelastic electron-Proton Scattering at Large Momentum Transfers

Miller, Guthrie ; Bloom, Elliott D. ; Buschhorn, G. ; et al.

Phys.Rev.D 5 (1972) 528, 1972.

Inspire Record 67123 DOI 10.17182/hepdata.22355

Differential cross sections for electrons scattered inelastically from hydrogen have been measured at 18°, 26°, and 34°. The range of incident energy was 4.5 to 18 GeV, and the range of four-momentum transfer squared was 1.5 to 21 (GeVc)2. With the use of these data in conjunction with previously measured data at 6° and 10°, the contributions from the longitudinal and transverse components of the exchanged photon have been separately determined. The values of the ratio of the photoabsorption cross sections σSσT are found to lie in the range 0 to 0.5. The question of scaling of 2MpW1 and νW2 as a function of ω is discussed, and scaling is verified for a large kinematic range. Also, a new scaling variable which reduces to ω in the Bjorken limit is introduced which extends the scaling region. The behavior of σT and σS is also discussed as a function of ν and q2. Various weighted sum rules of νW2 are evaluated.

18 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (0. TO 2.////DUE TO PION CONTAMINATION).

Table 2

Axis error includes +- 0.0/0.0 contribution (0. TO 2.////DUE TO PION CONTAMINATION).

Table 3

Axis error includes +- 0.0/0.0 contribution (0. TO 2.////DUE TO PION CONTAMINATION).

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COMPTON SCATTERING FROM HYDROGEN BETWEEN 5-GeV AND 17-GeV

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

Phys.Rev.Lett. 25 (1970) 1218, 1970.

Inspire Record 60845 DOI 10.17182/hepdata.21597

Measurements have been made on Compton scattering for photon energies between 5 and 17 GeV and t values from -0.06 to -1.1 (GeVc)2. The data were obtained by performing a coincidence between the Stanford Linear Accelerator Center 1.6-GeVc spectrometer and a Lucite shower counter. The scattering appears diffractive out to high t values, but the cross sections seem not to be in good agreement with the prediction of a strict vector-meson-dominance model.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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MEASUREMENT OF THE RATIO OF THE PROTON FORM-FACTORS, G(E) / G(M), AT HIGH MOMENTUM TRANSFERS AND THE QUESTION OF SCALING

Litt, J. ; Buschhorn, G. ; Coward, D.H. ; et al.

Phys.Lett.B 31 (1970) 40-44, 1970.

Inspire Record 54895 DOI 10.17182/hepdata.28767

Electron-proton elastic scattering cross sections have been measured at the Stanford Linear Accelerator Center at four-momentum transfers squared (q 2 ) of 1.0, 1.5, 2.0, 2.5and 3.75 (GeV/ c ) 2 . The angular distributions at q 2 = 2.5 and 3.75 (GeV/ c ) 2 are sufficient to provide values of the ratio G E / G M independent of the results from other laboratories. Our results are compatible with scaling, G E (q 2 ) = G M (q 2 )/ μ , within the experimental errors.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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High-Energy Inelastic e p Scattering at 6-Degrees and 10-Degrees

Bloom, Elliott D. ; Coward, D.H. ; DeStaebler, H.C. ; et al.

Phys.Rev.Lett. 23 (1969) 930-934, 1969.

Inspire Record 54874 DOI 10.17182/hepdata.21635

Cross sections for inelastic scattering of electrons from hydrogen were measured for incident energies from 7 to 17 GeV at scattering angles of 6° to 10° covering a range of squared four-momentum transfers up to 7.4 (GeV/c)2. For low center-of-mass energies of the final hadronic system the cross section shows prominent resonances at low momentum transfer and diminishes markedly at higher momentum transfer. For high excitations the cross section shows only a weak momentum-transfer dependence.

9 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (?////FROM UNCERTAINTY IN ELECTRON-DETECTION EFFICIENCY).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////FROM UNCERTAINTY IN ELECTRON-DETECTION EFFICIENCY).

Table 3

Axis error includes +- 0.0/0.0 contribution (?////FROM UNCERTAINTY IN ELECTRON-DETECTION EFFICIENCY).

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Pi-minus + p ---> k-neutral + lambda/sigma-neutral associated production in the forward direction at 6,8,10 and 11.2 gev/c

Bertolucci, E. ; Mannelli, I. ; Pierazzini, G. ; et al.

Lett.Nuovo Cim. 2S1 (1969) 149-155, 1969.

Inspire Record 58290 DOI 10.17182/hepdata.37419

None

2 data tables

Table 1

Only statistical errors are given.

Table 2

Only statistical errors are given.

Differential Pion Charge-Exchange Scattering and $\eta$ Production: $\pi^-+p\to \pi^0 + n$ from 2.4 to 3.8 GeV/c, at 6 GeV/c and at 10 GeV/c, $\pi^-+p\to \eta^0 + n$ at 10 GeV/c

Wahlig, M.A. ; Mannelli, I. ;

Phys.Rev. 168 (1968) 1515-1526, 1968.

Inspire Record 1186784 DOI 10.17182/hepdata.749

Small-angle differential cross sections are presented here for π−+p→π0+n charge-exchange scattering between 2.4 and 3.8 GeV/c. The differential cross section near t=0 displays two minima and one maximum in this momentum interval, reflecting the presence of the N32*(2420), N32*(2850), and N12*(2650) resonances; at larger t values, the cross sections fall off exponentially as a function of t, just as has been previously observed for charge-exchange scattering above 6 GeV/c. The pion-charge-exchange data reported here at 6 and 10 GeV/c extend out to large angles, showing a maximum near t=0, followed by an exponential falloff as e10t, a minimum near −t=0.6 (GeV/c)2, and then a second maximum near −t=1.0 (GeV/c)2. The π−+p→η0+n differential cross section shows a maximum near t=0, followed by an exponential falloff as e4t, much less steep than the π0 slope. These data are compared to our previously published data and to those of the Saclay-Orsay group.

15 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.