Pion-Proton Scattering
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Pionic charge exchange on the proton from 40-MeV to 250-MeV.

Breitschopf, J. ; Bauer, M. ; Clement, H. ; et al.
Phys.Lett.B 639 (2006) 424-428, 2006.
Inspire Record 717060 DOI 10.17182/hepdata.31547

The total cross sections for pionic charge exchange on hydrogen were measured using a transmission technique on thin CH2 and C targets. Data were taken for pi- lab energies from 39 to 247 MeV with total errors of typically 2% over the Delta-resonance and up to 10% at the lowest energies. Deviations from the predictions of the SAID phase shift analysis in the 60 to 80 MeV region are interpreted as evidence for isospin-symmetry breaking in the s-wave amplitudes. The charge dependence of the Delta-resonance properties appears to be smaller than previously reported.

1 data table
Table 1

Measured total charge exchange cross sections. The errors are the combined statistical and ststematic errors including normalisation uncertainties.


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.


Pion proton integral cross sections at T(pi) = 40-MeV to 284-MeV.

Kriss, B.J. ; Hoibraten, S. ; Holcomb, M.D. ; et al.
Phys.Rev.C 59 (1999) 1480-1487, 1999.
Inspire Record 500165 DOI 10.17182/hepdata.25638

Integral cross sections for the scattering of pions by protons into angles greater than 30° (lab) have been measured at a wide range of energies spanning the delta resonance using liquid hydrogen targets. Cross sections were measured for π+p scattering at 40 energies from 39.8 to 283.9 MeV and for π−p at 15 energies from 80.0 to 283.9 MeV. Comparisons with phase shift predictions from the Karlsruhe group show good agreement on resonance but significant deviations below 100 MeV.

2 data tables
Table 1

The uncertainties shown include statistical and systematic contributions.

Table 2

The uncertainties shown include statistical and systematic contributions.


Forward angle pi+- p elastic scattering differential cross-sections at T(pi) = 87-MeV to 139-MeV

Brack, J.T. ; Amaudruz, P.A. ; Ottewell, D.F. ; et al.
Phys.Rev.C 51 (1995) 929-936, 1995.
Inspire Record 400646 DOI 10.17182/hepdata.25894

Absolute π±p elastic scattering differential cross sections have been measured at five incident pion energies between 87 and 139 MeV. An active target of scintillator material (CH1.1) was used to detect recoil protons in coincidence with scattered pions. Pions were detected at forward angles between 27 and 98°c.m. where the low-energy recoil protons stop in the target. The cross sections, typically 5–10% lower than phase shift predictions for π+p and 10–20% lower for the π−p cross sections, are consistent with earlier measurements by this group.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Radiative decay of the Delta resonance: Analyzing powers for pi- p (polarized) ---> gamma n

Stasko, J.C. ; Bassalleck, B. ; Booth, E.C. ; et al.
Phys.Rev.Lett. 72 (1994) 973-976, 1994.
Inspire Record 376202 DOI 10.17182/hepdata.19677

The polarized target asymmetry AN for π−p→→γn has been measured by coincident detection of the γ and the neutron at several angles across the Δ resonace energy region. A high-resolution NaI γ spectrometer together with good time-of-flight information for the neutron resulted in excellent separation of this radiative capture reaction from the much higher cross-section charge exchange reaction π−p→→π0n. Statistical uncertainties are ΔAN=0.02-0.04, representing a significant improvement over previous results. The new data are discussed in the context of recent theoretical models.

1 data table
Table 1

No description provided.


Integral cross-sections for pi- p interaction in the 3,3 resonance region

Friedman, E. ; Paul, M. ; Schechter, M. ; et al.
Phys.Lett.B 302 (1993) 18-22, 1993.
Inspire Record 362059 DOI 10.17182/hepdata.28945

Total cross sections for the π − p single charge exchange and 20° “partial-total” cross sections have been measured between 126 and 202 MeV pion energy. The former are about 4% below similar results of Bugg et al. and (5–10)% below predictions made with currently accepted phase shifts. The latter agree quite well with calculations.

1 data table
Table 1

No description provided.


Integral cross-sections for pi+ p interaction in the 3,3 resonance region

Friedman, E. ; Goldring, A. ; Johnson, R.R. ; et al.
Phys.Lett.B 254 (1991) 40-43, 1991.
Inspire Record 316889 DOI 10.17182/hepdata.29507

Integral cross sections for π + p interaction have been measured between 125.9 and 201.7 MeV using the transmission method. Over this energy range the results are in very good agreement with predictions made with currently accepted phase shifts. These results are also consistent with similar measurements at lower energies when the dispersion relation constrained Karlsruhe phase shifts are used.

1 data table
Table 1

No description provided.


OBSERVATION OF INVERSE ELECTROPRODUCTION OF PIONS ON C-12 NUCLEUS AT 164-MeV PION ENERGY AND DETERMINATION OF F1(v) NUCLEON FORM-FACTOR

Alekseev, G.D. ; Blokhintseva, T.D. ; Karpukhin, V.V. ; et al.
Sov.J.Nucl.Phys. 46 (1987) 801, 1987.
Inspire Record 247868 DOI 10.17182/hepdata.38865

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


USE OF PI P ---> PI PI N REACTIONS TO STUDY PI PI SCATTERING IN THE ELASTIC INTERACTION REGION

Alekseeva, E.a. ; Kartamyshev, A.a. ; Makarin, V.k. ; et al.
Sov.Phys.JETP 55 (1982) 591-600, 1982.
Inspire Record 185170 DOI 10.17182/hepdata.2406

None

10 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Differential Cross-Section Measurements of pi- p ---> pi0 n Around the P(33) (1232) Resonance

Comiso, J.C. ; Blasberg, D.J. ; Haddock, R.P. ; et al.
Phys.Rev.D 12 (1975) 738, 1975.
Inspire Record 91073 DOI 10.17182/hepdata.24822

Differential cross sections for π−p→π0n at five angles for 239, 264, 295, 323, and 375 MeV/c incident pions are presented. The measurements employ the neutron-photon coincidence method, using carefully calibrated neutron counters and an efficient, large-area photon detector. Good agreement is found with the results of the CERN phase-shift analysis.

7 data tables
Table 1

Axis error includes +- 6.3/6.3 contribution.

Table 2

Axis error includes +- 5.5/5.5 contribution.

Table 3

Axis error includes +- 5.2/5.2 contribution.

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