Brookes, G.R
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pi--p Interactions at 683 MeV/c

Burnstein, R.A. ; Charlton, G.R. ; Day, T.B. ; et al.
Phys.Rev. 137 (1965) B1044-B1052, 1965.
Inspire Record 944965 DOI 10.17182/hepdata.983

Interactions of 683-MeV/c negative pions with protons were investigated using the BNL 14-in. hydrogen bubble chamber in a 17-kG field. Two thousand elastic scatterings were analyzed, yielding a cross section of 18.9±1.0 mb. No evidence for powers of cosθ higher than the second was observed in the elastic angular distribution. The angular distribution obtained was dσdω=(0.384±0.026)+(1.70±0.06)cosθ+(3.36±0.11)cos2θ mb/sr. The single-pion production reactions π−+p→π−+π0+p and π−+p→π−+π++n were studied in detail. A total of 441 π0 productions and 833 π+ productions were analyzed giving cross sections of 3.99±0.50 and 7.50±0.80 mb, respectively. The differential distributions for these inelastic processes are presented and compared with the predictions of the model of Olsson and Yodh. The distribution of events on the Dalitz plots for π0 production is accounted for by the model. However, for the π+ reaction, the model (so far developed) does not describe adequately the distribution of events on the Dalitz plot. In particular, the model fails to account for the enhancement at high (π+π−) effective masses in ππ mass distribution. The center-of-mass angular distributions for π0 and π+ production reactions are presented and compared with the model.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Measurements of the polarisation of the recoil proton in elastic electron proton scattering at q-squared=1.3, 1.5 and 1.9(gev/c)squared

Kirkman, H.C. ; Railton, R. ; Rutherglen, J.G. ; et al.
Phys.Lett.B 32 (1970) 519-522, 1970.
Inspire Record 63101 DOI 10.17182/hepdata.28765

An experiment has been carried out to determine the imaginary part of the two-photon exchange amplitude by measuring the polarisation of the recoil proton in elastic electron-proton scattering. The polirisation was found to be −0.006 ± 0.030 at q 2 = 1.3 (GeV/ c ) 2 , +0.052 ± 0.55 at 1.5 (GeV/ c ) 2 and +0.065 ± 0.087 at 1.9 (GeV/ c ) 2 .

1 data table
Table 1

No description provided.


Polarised target asymmetry for pi-zero photoproduction at 4 gev.

Booth, P.S.L. ; Boyes, E. ; Court, G.R. ; et al.
Conf.Proc.C 710830 (1971) 213-215, 1971.
Inspire Record 1093328 DOI 10.17182/hepdata.70366

None

1 data table
Table 1

No description provided.


The total photon-proton cross-section for hadron production

Armstrong, T.A. ; Hogg, W.R. ; Lewis, G.M. ; et al.
Phys.Lett.B 34 (1971) 535-538, 1971.
Inspire Record 69289 DOI 10.17182/hepdata.28520

The total hadronic cross section, σ T has been measured for tagged γ -rays, using electron beams in the GeV range, and narrow energy bins. Preliminary data are given covering the γ -energy region 275 MeV-1850 MeV, where interesting structure characteristics are observed.

1 data table
Table 1

No description provided.


Anti-p p elastic scattering in the t-meson region

Kalbfleisch, G.R. ; Strand, R.C. ; Vanderburg, V. ;
Nucl.Phys.B 30 (1971) 466-476, 1971.
Inspire Record 68593 DOI 10.17182/hepdata.33324

We have made improved measurements of 43.8 ± 0.8, 41.3 ± 0.4 and 39.3 ± 0.8 mb for the p p elastic cross sections at 1.11, 1.33 and 1.52 GeV/ c laboratory momenta respectively. Sharp forward peaks in the differential cross sections with broad secondary maxima agree with previous observations [3–6]. The forward differential cross sections are (11 ± 3)% above the optical point in agreement with real amplitudes extended from lower momenta using dispersion relations [7]. The elastic cross sections do not show any structure in the s -channel. Backward differential cross sections show the onset of a “third diffraction peak” but no evidence for other structure in agreement with earlier experiments [6, 13].

5 data tables
Table 1

STATISTICAL PLUS SYSTEMATIC ERRORS.

Table 2

STATISTICAL PLUS SYSTEMATIC ERRORS.

Table 3

COUNTS WERE MULTIPLIED BY 1.000 TO GET THESE.. TOTAL NUMBER EVENTS= 543. READ FROM GRAPH.

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Total hadronic cross-section of gamma rays in hydrogen in the energy range 0.265-GeV to 4.215-GeV

Armstrong, T.A. ; Hogg, W.R. ; Lewis, G.M. ; et al.
Phys.Rev.D 5 (1972) 1640-1652, 1972.
Inspire Record 67298 DOI 10.17182/hepdata.22462

The total cross section of γ rays in hydrogen resulting in hadron production, σT, has been measured over the energy range 265-4215 MeV. A tagging system with narrow energy bins was employed. Structure in the resonance region followed by a steady fall with energy has been observed and the results are analyzed. The forward amplitude of γ-proton scattering is evaluated, and its behavior in the Argand diagram studied as a function of energy. The relationships of the measurements to Regge-pole theory and the vector-dominance model are detailed.

2 data tables
Table 1

No description provided.

Table 2

SPIN AVERAGED FORWARD COMPTON SCATTERING AMPLITUDE. IM(AMP) WAS CALCULATED VIA THE OPTICAL THEOREM FROM A SMOOTH FIT TO THE DATA, AND USED IN THE DISPERSION RELATION TO CALCULATE RE(AMP). AT THRESHOLD THE THOMSON AMPLITUDE IS -3.0 MUB*GEV.


Polarized target asymmetry for pi-zero photoproduction at 4 gev

Booth, P.S.L. ; Court, G.R. ; Craven, B. ; et al.
Phys.Lett.B 38 (1972) 339-341, 1972.
Inspire Record 75858 DOI 10.17182/hepdata.28336

The polarized target asymmetry parameter has been measured for single π o photoproduction from hydrogen at 4 GeV and values of four-momentum transfer squared between −0.15 (GeV/ c ) 2 and −1.8 (GeV/ c ) 2 .

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).


A search for xi* resonances in k- p interactions at 3.95 gev/c

Badier, J. ; Barrelet, E. ; Charlton, G.R. ; et al.
Nucl.Phys.B 37 (1972) 429-443, 1972.
Inspire Record 75291 DOI 10.17182/hepdata.32965

A 12 event/μb bubble chamber experiment on K − p interactions at 3.95 GeV/ c yielded 1212 events including systems with strangeness S = −2. Results concerning cascade resonances with masses less than 2000 MeV are reported; in particular a determination of the mass and width of the Ξ o 1530 and an interpretation of the mass region (1700–/) 2000) MeV.

1 data table
Table 1

No description provided.


The total pair production cross-section of gamma-rays in hydrogen and deuterium

Rawlinson, W.R. ; Tait, N.R.S. ; Thompson, J.C. ; et al.
Nucl.Phys.B 45 (1972) 41-46, 1972.
Inspire Record 75026 DOI 10.17182/hepdata.32781

The total electromagnetic cross sections of g-rays in hydrogen and deuterium have been measured over the energy range 265–4215 MeV using a photon tagging system. From these measurements, the total pair production cross sections are obtained, and the results are found to be in good agreement with the predictions of Jost, Luttinger and Slotnick.

2 data tables
Table 1

Axis error includes +- 1/1 contribution.

Table 2

Axis error includes +- 1/1 contribution.


The recoil proton polarization in the reaction gamma p ---> pi0 p in the third resonance region

Prentice, M.N. ; Railton, R. ; Rutherglen, J.G. ; et al.
Nucl.Phys.B 41 (1972) 353-364, 1972.
Inspire Record 75162 DOI 10.17182/hepdata.32916

Measurements have been made of the polarization of the recoil proton in the process γ p → π o p for photon energies of 850 - 1250 MeV and centre-of-mass angles of 80° - 125°. The results, which are to a typical accuracy of ±0.09, show a marked disagreement with previous phenomenological analyses above 1000 MeV.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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