Choquet-Louedec, C.
nucl-ex
Pion-Proton Scattering
Max results
Sort by Reverse order

Showing 10 of 12 results

$\pi^+ − p$ elastic scattering at 820, 900 and 1050 MeV

Barloutaud, R. ; Choquet-Louedec, C. ; Derem, A. ; et al.
Phys.Lett. 1 (1962) 207-208, 1962.
Inspire Record 1400915 DOI 10.17182/hepdata.31235

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Backward π p elastic scattering at 2.85 and 3.30 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.
Phys.Lett.B 25 (1967) 361-364, 1967.
Inspire Record 1389663 DOI 10.17182/hepdata.29442

Backward elastic scattering has been measured for π + p at 2.85 and 3.30 GeV/ c and for π − p at 3.30 GeV/ c . The π + p angular distributions show steep backward peaks, whereas the π − p distribution is flatter. At 2.85 GeV/ c the π + p differential cross section close to 180° is more than twice that at 3.30 GeV/ c , supporting the assignment J P = 11 2 + for Δ δ (2420) resonance. The π + p data at 2.85 GeV/ c indicate the onset of a dip at cos θ c.m. ≈ −0.97.

3 data tables
Table 1

The data for cos(theta) = 1 is the extrapolation.

Table 2

The data for cos(theta) = 1 and U = 0 are the extrapolations.

Table 3

The data for cos(theta) = 1 and U = 0 are the extrapolations.


The angular distribution of backward elastically scattered pions at 3.55 GeV/c

Baker, W.F. ; Carlson, P.J. ; Chabaud, V. ; et al.
Phys.Lett. 23 (1966) 605-609, 1966.
Inspire Record 1389621 DOI 10.17182/hepdata.29776

The elastic scattering of 3.55 GeV/ c π + and π − mesons by protons was measured at centre-of-mass angles between 165° and 177°. The angular distributions for 864 events show a steeply rising backward peak for π + p, while the shape is less clear for π − p.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

Extrapolations.


Differential cross section of the pion nucleon charge-exchange reaction pi- p --> pi0 n in the momentum range from 148-MeV/c to 323-MeV/c.

The Crystal Ball collaboration Sadler, M.E. ; Kulbardis, A. ; Abaev, V. ; et al.
Phys.Rev.C 69 (2004) 055206, 2004.
Inspire Record 646714 DOI 10.17182/hepdata.31725

Measured values of the differential cross section for pion-nucleon charge exchange are presented at momenta 148, 174, 188, 212, 238, 271, 298, and 323 MeV/c, a region dominated by the Delta resonance. Complete angular distributions were obtained using the Crystal Ball detector at the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory (BNL). Statistical uncertainties of the differential cross sections are typically 2-6%, exceptions being the results at the lowest momentum and at the most forward measurements of the five lowest momenta. We estimate the systematic uncertainties to be 3-6%.

3 data tables
Table 1

The errors shown are statistical only.

Table 2

The errors shown are statistical only.

Table 3

The total charge-exchange reaction cross section as a function of pion momentum obtained by integrating the differential cross sections. The errors shown are the total and statistical errors.


Measurement of pi+ p (polarized) analyzing power at 68.3-MeV

Wieser, R. ; Denig, A. ; von Hagel, U. ; et al.
Phys.Rev.C 54 (1996) 1930-1934, 1996.
Inspire Record 429106 DOI 10.17182/hepdata.25768

The analyzing power Ay for π+p→ scattering at 68.3 MeV has been measured at the Paul Scherrer Institut with the magnetic spectrometer LEPS. The measurements cover the angular range 40°≤θlab≤70°. The protons have been polarized in a butanol target, operated in frozen spin mode. The S31 phase shift comes out by about 1° smaller than the Koch-Pietarinen [Nucl. Phys. A 336, 331 (1980)] phase shift analysis, supporting the necessity of an alternative dispersion analysis of πN scattering to determine the σ term and the πN coupling constant. © 1996 The American Physical Society.

1 data table
Table 1

The two data sets correspond to measurements with two different target compositions (see text).


Low-energy differential cross-sections of pion proton (pi+- p) scattering. 2: Phase shifts at T(pi) = 32.7-MeV, 45.1-MeV, and 68.6-MeV

Joram, C. ; Metzler, M. ; Jaki, J. ; et al.
Phys.Rev.C 51 (1995) 2159-2165, 1995.
Inspire Record 404659 DOI 10.17182/hepdata.25955

We report on measurements of the differential π±p cross section at pion energies Tπ=32.7, 45.1, and 68.6 MeV. The measurements, covering the angular range 25°≤θlab≤123°, have been carried out at the Paul-Scherrer-Institute (PSI) in Villigen, Switzerland, employing the magnet spectrometer LEPS. The absolute normalization of the π±p cross sections have been achieved by relating them to the electromagnetic cross sections of μ±12C scattering. The results are in agreement with those of our preceding measurements at Tπ=32.2 and 45.1 MeV insofar as they overlap with the region of the Coulomb nuclear interference investigated there. A comparison with the predictions of the Karlsruhe-Helsinki phase shift analysis KH80, which has formed the basis for the determination of the ‘‘experimental’’ σ term, reveals considerable deviations. These are most pronounced for the π+p cross sections at Tπ=32.7 and 45.1 MeV. Single energy partial wave fits result in S-wave contributions, which are about 1° lower in magnitude then those specified by the KH80 solution. The data at 68.6 MeV are in good agreement with the phase shift analysis.

3 data tables
Table 1

Statistical and systematic errors are addet in quadrature.

Table 2

Statistical and systematic errors are addet in quadrature.

Table 3

Statistical and systematic errors are addet in quadrature.


Low-energy differential cross-sections of pion proton (pi+- p) scattering. 1: The Isospin even forward scattering amplitude at T(pi) = 32.2-MeV and 44.6-MeV

Joram, C. ; Metzler, M. ; Jaki, J. ; et al.
Phys.Rev.C 51 (1995) 2144-2158, 1995.
Inspire Record 404658 DOI 10.17182/hepdata.25972

The values of the pion nucleon (πN) σ term, as determined, on the one hand, from experimental pion nucleon scattering by means of dispersion relations and, on the other hand, from baryon masses by means of chiral perturbation theory, differ by 10 to 15 MeV. The origin of this discrepancy is not yet understood. If the difference between the two values is attributed to the scalar current of strange sea quark pairs within the proton, the contribution to the proton mass would be of the order of 120 MeV. The discrepancy may hint at either theoretical deficiencies or an inadequate πN database. In order to provide reliable experimental data we have measured angular distributions of elastic pion proton scattering at pion energies Tπ=32.2 and 44.6 MeV using the magnet spectrometer LEPS located at the Paul-Scherrer-Institute (PSI) in Villigen, Switzerland. From the data covering the region of the Coulomb nuclear interference, the real parts of the isospin-even forward scattering amplitude ReD+(t=0), have been determined as a function of energy. The results have been compared with the predictions of the Karlsruhe-Helsinki phase shift analysis KH80, revealing discrepancies most pronounced for the π+p data. The experimentally determined values for ReD+(t=0), however, support the KH80 prediction (which is based on πN data available in 1979).

2 data tables
Table 1

Statistical and systematic errors are addet in quadrature.

Table 2

Statistical and systematic errors are addet in quadrature.


A PARTIAL WAVE ANALYSIS OF THE (K pi pi) SYSTEM IN THE REACTION pi- p ---> (K+ pi- pi0) LAMBDA AT 3.95-GeV/c

The CERN-College de France-Madrid-Stockholm collaboration Fernandez, C. ; Aguilar-Benitez, M. ; Cerrada, M. ; et al.
Z.Phys.C 16 (1982) 95, 1982.
Inspire Record 178875 DOI 10.17182/hepdata.16389

Results from a partial wave analysis of theKππ system produced in the hypercharge exchange reaction π−p→(K+π−π0)Λ at 3.95 GeV/c are presented. SignificantQ1 production is observed but no evidence is found forQ2 production thus confirming the results obtained in a previous decay Dalitz plot analysis of the same reaction. The relative phase behaviour of the 1+(Kϱ) partial waves obtained with the present analysis provides additional confirmation of the resonance interpretation of theQ1 enhancement. Information is also obtained about its production properties and the role played by the Λ polarization in the hypercharge exchange reaction. This is compared with the results obtained in the reactionK−p→(π+π−π0)Λ at 4 GeV/c.

6 data tables
Table 1

LAMBDA POLARIZATION CALCULATED AS AVERAGE POLARIZATION OF ALL 1 + (K RHO0) PARTIAL WAVES IN THE QLOW(1240) REGION.

Table 2

SPIN PARITY CONTENT OF (K PI PI) SYSTEM.

Table 3

CONTRIBUTION TO THE TOTAL JP=1+ INTENSITY FROM THE K* AND RHO ISOBARS.

More…

Elastic scattering of positive pions on polarized protons between 0.82 and 2.74 gev/c

Albrow, M.G. ; Andersson-Almehed, S. ; Bosnjakovic, B. ; et al.
Nucl.Phys.B 25 (1970) 9-48, 1971.
Inspire Record 68844 DOI 10.17182/hepdata.7102

Polarization and differential cross-section data for elastic scattering of positive pions on protons between 0.82 and 2.74 GeV/ c are presented. A dip in the polarization, at constant u ≈ −0.65 GeV 2 , is observed. The data are compared with published phase-shift analyses.

96 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Experimental Results on pi- p Interactions in the Center-Of-Mass-Energy Range 1.50-GeV-1.74-GeV

Dolbeau, J. ; Neveu, M. ; Triantis, F.A. ; et al.
Nucl.Phys.B 78 (1974) 233-250, 1974.
Inspire Record 89856 DOI 10.17182/hepdata.21889

Channel cross sections, elastic differential cross sections and single pion production mass spectra and angular distributions are presented for π − p interactions, based on 139 000 events observed at six energies in the center of mass region 1.50–1.74 GeV.

10 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…