Real to Imaginary Ratio of the $\bar{p} p$ Forward Elastic Scattering Amplitude at 550-{MeV}/$c$, 757-{MeV}/$c$ and 1077-{MeV}/$c$

Schiavon, P. ; Birsa, R. ; Bos, K. ; et al.
Nucl.Phys.A 505 (1989) 595-609, 1989.
Inspire Record 277295 DOI 10.17182/hepdata.36894

The ratio of the real to the imaginary part of the pp forward elastic-scattering amplitude ϱ has been measured at 550, 757, and 1077 MeV/ c at LEAR, using the Coulomb-nuclear interference method. The results obtained for ρ and b , the nuclear slope, are ϱ = 0.084 ± 0.051 and b = 20.9 ± 2.1 (GeV/ c ) −2 at 550 MeV/ c , ϱ = 0.102 ± 0.043 and b = 18.0 ± 0.5 (GeV/ c ) −2 = at 757 MeV/ c , and ϱ = 0.059 ± 0.035 and b = 15.2 ± 0.3 (GeV/ c ) −2 at 1077 MeV/ c .

4 data tables

Error on SLOPE is statistical only.

Measured differential cross sections corrected for small-angle trigger efficiency and absorption losses. Statistical errors only.

Measured differential cross sections corrected for small-angle trigger efficiency and absorption losses. Statistical errors only.

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Measurement of Anti-proton - Proton Small Angle Elastic Scattering at Low Momentum

Linssen, L. ; Beard, C.I. ; Birsa, R. ; et al.
Nucl.Phys.A 469 (1987) 726, 1987.
Inspire Record 245092 DOI 10.17182/hepdata.37014

Two high statistics measurements of antiproton-proton small-angle elastic scattering, at p = 233 MeV/ c and p = 272 MeV/ c , are presented. The measurements were carried out at the LEAR facility at CERN. By the Coulomb-nuclear interference method, values are obtained for the real-to-imaginary ratio ρ of the p̄p forward nuclear scattering amplitude and for its exponential slope b : ρ = + 0.041 ± 0.026 and b = 71.5 ± 4.5 (GeV/ c ) −2 at 233 MeV/ c and ρ = −0.014 ± 0.027 and b = 47.7 ± 2.7 (GeV/ c ) −2 at 272 MeV/ c . The method to derive these values is discussed in detail and so are the uncertainties contributing to their systematic error. The results are compared with predictions from forward dispersion relation calculations and with predictions from p̄p potential models.

3 data tables

The corrected cross section is the measured divided by the average folding correction given in the paper.

The corrected cross section is the measured divided by the average folding Correction given in the paper.

Fits to data use the value of total cross sections of 263 & 296 mb for 272 & 233 Mev respectively derived from the authors total cross sections measurement. ETA is the spin dependence parameter.


Anti-p p elastic and charge exchange scattering at 230 mev

Kohno, H. ; Kaneko, S. ; Murata, Y. ; et al.
Nucl.Phys.B 41 (1972) 485-492, 1972.
Inspire Record 75157 DOI 10.17182/hepdata.6879

Reactions p p → p p and p p → n n were studied at the kinetic energy 230 MeV of incident p by using bubble chamber films. Total cross sections for both of the reactions were found to be 51.2 ± 1.6 mb and 9.1 ± 0.6 mb, respectively. Differential cross sections are well explained by the phenomenological theory given by Bryan and Phillips.

5 data tables

No description provided.

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A MEASUREMENT OF THE ANTI-P P DIFFERENTIAL ELASTIC CROSS-SECTION AND OF THE COULOMB - NUCLEAR INTERFERENCE BETWEEN 353-MEV/C AND 578-MEV/C

Cresti, M. ; Peruzzo, L. ; Sartori, G. ;
Phys.Lett.B 132 (1983) 209-213, 1983.
Inspire Record 200209 DOI 10.17182/hepdata.30632

We have measured the p p differential elastic cross section at 8 momenta from 353 to 578 MeV/ c , determining, for each momentum, the ratio ρ of the real to imaginary parts of the elastic forward amplitude, the slope b of the elastic cross section and the total p p cross section σ. Our results are compared with previous experimental results and with theoretical predictions.

3 data tables

No description provided.

No description provided.

Numerical values supplied by M. Cresti.


The Real Part of anti-p p Forward Elastic Scattering Amplitude at 0.7-GeV/c

Kaseno, H. ; Hamatsu, R. ; Kawano, K. ; et al.
Phys.Lett.B 61 (1976) 203-206, 1976.
Inspire Record 3400 DOI 10.17182/hepdata.27693

The differential cross sections of p p elastic scattering at 0.7 GeV/ c were obtained in the range 0.0018<| t |⩽0.0320 GeV 2 . From the interference between the Coulomb and the nuclear amplitude, the ratio of real to imaginary part of the forward nuclear amplitude was found to be +0.33±0.04.

3 data tables

No description provided.

No description provided.

FIT FOR FORWARD NUCLEAR AMPLITUDE IN COULOMB INTERFERENCE REGION.


Evidence for J(PC) = 4++ for the S (1930) Meson from anti-p p Backward Elastic Scattering

D'Andlau, C. ; Cohen-Ganouna, J. ; Laloum, M. ; et al.
Phys.Lett.B 58 (1975) 223-227, 1975.
Inspire Record 103552 DOI 10.17182/hepdata.27801

We report on partial results of the analysis of a p̄p backward elastic scattering experiment, between 175 and 750 MeV/ c . Various evidences are given of the resonant nature of a backward peak at the S-meson mass. Analysis leads to J PC =4 ++ , firmly connected to other experimental data with I G =1 − . All results agree for an assignment to the A 2 trajectory.

11 data tables

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Elastic scattering, pion production, and annihilation into pions in antiproton-proton interactions at 5.7 GeV/c

Böckmann, K. ; Nellen, B. ; Paul, E. ; et al.
Nuovo Cim.A 42 (1966) 954-996, 1966.
Inspire Record 1185317 DOI 10.17182/hepdata.1061

An extensive investigation of antiproton-proton interactions at 5.7 GeV/c without strange-particle production was carried out using a hydrogen bubble chamber. Cross-sections for different channels are given and discussed. The reliability of the analysis was checked using artificially generated events. The cross-sections for elastic scattering, for all processes involving annihilation, and for all other inelastic processes are respectively σel=(16.3±0.6)mb,σannlbil=(22.5±2.0)mb, σinel=(24.8±2.0)mb. TheN * 1:38 is present both in the single and multiple pion production channels. For the reaction MediaObjects/11539_2007_Article_BF02720569_f1.jpg a cross-section of (1.05±0.21) mb was obtained. Cross-sections forN * 1238 production in other channels are also given. Some indication of the presence ofI=1/2 isobars was found in the nucleon-pion and the nucleon-two-pion systems. The inelastic nonannihilation reactions were found to be strongly peripheral. The one-pion exchange model including either a form factor or corrections for absorption was applied to the reaction MediaObjects/11539_2007_Article_BF02720569_f2.jpg . Neither version of the model could correctly account for all features of the reaction. The average number of pions in the annihilation was found to be 7.3±0.6. The presence of an asymmetry in the angular distribution of the charged pions was confirmed at this energy; it is due mostly to high-energy pions. The production of ρ and ω mesons was observed in various annihilation channels. Rates of up to 80% for ρ production and up to 15% for ω production were obtained by fitting phase-space and Breit-Wigner curves to the effective-mass distributions of different channels.

5 data tables

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