Key, A.W.
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Strange Particle Cross-Sections from pi+ p Interactions at 10.3-GeV/c

Goddard, M.C. ; Gilbert, D. ; Key, A.W. ; et al.
Phys.Rev.D 16 (1977) 7, 1977.
Inspire Record 5358 DOI 10.17182/hepdata.24450

Cross sections are presented for production of final states with two strange particles from π+p interactions at 10.3 GeV/c in a 31.1-event/μb bubble-chamber experiment.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


F0 (1270) Production in the Reaction pi- p --> pi+ pi- n at 12-GeV/c and 15-GeV/c

Alexander, G. ; Dagan, S. ; Gnat, Y. ; et al.
Nucl.Phys.B 131 (1977) 365-385, 1977.
Inspire Record 127448 DOI 10.17182/hepdata.35193

The production of the f 0 (1270) has been studied in the reaction π − p → π + π − n at 12 and 15 GeV/ c in the momentum transfer range 0.02 to 0.80 GeV 2 . Differential and total cross sections for the reaction π − p → f 0 n have been determined. The f 0 decay density matrix elements have been evaluated requiring all the matrix eigenvalues to be non-negative. The relative unnatural and natural parity exchange contributions to the f 0 production have been studied. The results are compared with a Regge exchange model formulated in terms of the pion and A 2 exchanges including cut contributions.

7 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The Polarized Beam Asymmetry in Photoproduction of eta Mesons from Protons at 2.5-GeV and 3.0-GeV

Bussey, P.J. ; Raine, C. ; Rutherglen, J.G. ; et al.
Phys.Lett.B 61 (1976) 479-482, 1976.
Inspire Record 108515 DOI 10.17182/hepdata.27687

Measurements of the polarised beam asymmetry parameter Σ for eta photoproduction from protons, have been carried out at incident energies of 2.5 GeV and 3.0 GeV, and for various t -values between −0.2 (GeV/c) 2 and −1.2 (GeV/c) 2 . The values of Σ are close to +1 for values of | t | less than 0.7 (GeV/c) 2 , showing that there can be little contribution from unnatural parity exchange in any Regge exchange model of the process, in disagreement with present theories. Differential cross sections for the process werre also measured, and are consistent with those from other experiments.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Omega Production in the Reaction pi- p --> pi+ pi- pi0 n at 8-GeV/c and 12-GeV/c

Dowell, J.D. ; Garvey, J. ; Jobes, M. ; et al.
Nucl.Phys.B 108 (1976) 30-44, 1976.
Inspire Record 100856 DOI 10.17182/hepdata.35781

The reaction π − p → ω n has been studied at 8 and 12 GeV / c incident momenta with the CERN Omega spectrometer using a neutron time of flight trigger. The differential cross sections and the ω-decay density matrix elements are presented as functions of the momentum transfer squared − t in the range of 0.02 to 0.80 GeV 2 . The data are used to evaluate the intercept and slope of both the natural and unnatural parity exchange trajectories. Regge exchange amplitude factorisation tests involving the reaction π N → ω N are investigated.

3 data tables
Table 1

No description provided.

Table 2

'FIT'.

Table 3

'FIT'.


Measurement of the Depolarization Parameter in Elastic Proton Proton Scattering at 3 and 6-GeV/c

Abshire, G.W. ; Bryant, G.W. ; Corcoran, M. ; et al.
Phys.Rev.D 12 (1975) 3393-3398, 1975.
Inspire Record 104822 DOI 10.17182/hepdata.24809

Results are presented from an experiment designed to make the first systematic study of the depolarization parameter in elastic proton-proton scattering at high energies. Measurements were made at 3.0 and 6.0 GeV/c at |t| values extending to 1.7 (GeV/c)2 at the higher momentum. A high-intensity unpolarized proton beam was incident on a polarized proton target and the polarization of the elastically scattered recoil protons was determined with a carbon analyzer. The results are discussed in the framework of optical and exchange models.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Study of the A2: An Analysis of the Reaction pi- p --> eta pi- p and a Missing Mass Spectrum at 6-GeV/c

Underwood, D. ; Conforto, G. ; Kramer, M.A. ; et al.
Phys.Rev.D 11 (1975) 2345-2366, 1975.
Inspire Record 103078 DOI 10.17182/hepdata.24888

The reaction π−p→X−p, X−→ηπ−, η→γγ has been studied in an optical spark-chamber experiment at the Argonne ZGS (Zero Gradient Synchrotron) at a beam momentum of 6.0 GeV/c and with 0.27≤|t|≤0.42 (GeV/c)2. The ηπ mass spectrum contains about 1400 events in the mass range 0.80<M(ηπ)<1.55 GeV/c2, and is dominated by approximately 1000 events of the type A2−→ηπ−. No structure is discernible within the A2 mass spectrum for an experimental resolution of 7.1 MeV/c2 [16.7 MeV/c2 FWHM (full width at half maximum)]. A single D-wave Breit-Wigner distribution fits the data with a high confidence level, yielding for the A2 the parameters M0=1.323±0.003 GeV/c2 and Γ0=0.108±0.009 GeV/c2. The angular distribution of the decay A2−→ηπ− is analyzed and the resultant density matrix elements have the values ρ11=0.45±0.02, ρ1−1=0.45±0.04, and ρ00=0.09±0.04. All other elements are consistent with zero. Finally, the missing-mass spectrum in the region of the A2 is presented. A signal of 230 events above background per 5-MeV/c2 interval is observed at the A2 peak, with a signal to background ratio of greater than 1:1. A single D-wave Breit-Wigner distribution together with a quadratic background fits the data well, with the parameters for the A2 being M0=1.324±0.003 GeV/c2 and Γ0=0.104±0.009 GeV/c2. Both A2 mass spectra are incompatible with the dipole shape.

2 data tables
Table 1

No description provided.

Table 2

THIS FIT ASSUMES ALL OTHER DENSITY MATRIX ELEMENTS (RHO(2M) AND RE(RHO(10))) ARE ZERO SINCE THEY ARE QUITE CONSISTENT WITH ZERO IN A FULL FIT. QUOTED ERRORS INCLUDE SYSTEMATIC ERRORS, WHILE STATISTICAL FITTING ERRORS ARE SHOWN SEPARATELY.


Total hadronic photoabsorption cross-sections of nuclei for photons in the gev energy range

Brookes, G.R. ; Clough, A.S. ; Freeland, J.H. ; et al.
Phys.Rev.D 8 (1973) 2826-2836, 1973.
Inspire Record 93332 DOI 10.17182/hepdata.22018

The total hadronic photoabsorption cross sections of a number of nuclei (C, Al, Cu, Nb, Sn, Ta, Pb) have been studied in detail using a tagged photon beam over the energy range 1.7-4 GeV. The results are described, and compared with models of photoabsorption.

3 data tables
Table 1

STATISTICAL ERRORS. MEAN CROSS SECTIONS FOR EACH OF THE TWO ELECTRON BEAM ENERGIES OF 3.5 AND 4.6 GEV ARE ALSO GIVEN.

Table 2

A-EFFECTIVE/A, USING SIG(GAMMA P) = 137 MUB AND SIG(GAMMA N) = 126 MUB. STATISTICAL ERRORS.

Table 3

A-EFFECTIVE/A, USING SIG(GAMMA P) = 129 MUB AND SIG(GAMMA N) = 123 MUB. STATISTICAL ERRORS.


K- p elastic scattering at 3.59 gev/c

Lowman, A.W. ; Mccubbin, N.A. ;
Nucl.Phys.B 61 (1973) 296-306, 1973.
Inspire Record 83883 DOI 10.17182/hepdata.32485

We have measured the K − p elastic-scattering differential cross section at 3.59 GeV/ c for t < −0.1 (GeV/ c ) 2 . After all geometrical and kinematical cuts we have 11 734 elastic events. The forward diffraction peak has a slope of 7.57 ± 0.1 (GeV/ c ) −2 , and there is a marked dip-bump structure at t ∼ −1.0 (GeV/ c ) 2 . The elastic cross section is 4.4 ± 0.2 mb. There is no evidence for a backward peak.

2 data tables
Table 1

No description provided.

Table 2

EVENTS NORMALIZED TO A TOTAL CROSS SECTION OF 26.3 +- 0.3 MB.


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 total photon deuteron hadronic cross-section in the energy range 0.265-4.215 gev

Armstrong, T.A. ; Hogg, W.R. ; Lewis, G.M. ; et al.
Nucl.Phys.B 41 (1972) 445-473, 1972.
Inspire Record 75161 DOI 10.17182/hepdata.32884

The total cross section for photoproduction of hadrons on the deutron, σ T d , has been measured for photon energies in the range 0.265–40215 GeV. From this, using results for the photon total cross section, obtained previously with the same apparatus, the neutron total cross section has been determined in the resonance region. The resonant structure is found to be quite different from that for the proton. Thereafter the neutron cross section falls off steadily with energy, and the values obtained are consistently lower than those for the proton. Forward scattering amplitudes have been evaluated for the deuteron.

4 data tables
Table 1

No description provided.

Table 2

RESONANCE REGION. UNSMEARING CORRECTION APPLIED, GLAUBER CORRECTION NEGLIGIBLE.

Table 3

HIGHER ENERGY CROSS SECTIONS, IN 200 MEV BINS. OVERALL 3 PCT SYSTEMATIC ERROR IN ADDITION TO QUOTED STATISTICAL ERRORS. NEUTRON/PROTON CROSS SECTION RATIO HAS MEAN VALUE OF 0.94 +- 0.01.

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