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A bubble chamber study of π-p charge-exchange scattering at 930 MeV is reported. The forward differential cross-section is derived and compared with the result obtained on the basis of dispersion relations and the charge-independence hypothesis. Satisfactory agreement is obtained.

1 data table

Table 1

No description provided.

π−+p→π0+n Charge-Exchange Scattering at High Energies

Mannelli, I. ; Bigi, A. ; Carrara, R. ; et al.

Phys.Rev.Lett. 14 (1965) 408, 1965.

Inspire Record 1474811 DOI 10.17182/hepdata.75497

Phys. Rev. Lett. 14, 408 (1965)

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The investigation of charge-exchange of $\pi^- + p \rightarrow n + \pi^0$ and $\pi^- + p \rightarrow n + \eta (\eta \rightarrow 2\gamma)$ reaction in the momentum interval 1.25-4.5 BeV/c

Barmin, V.V. ; Dolgolenko, A.G. ; Krestnikov, Yu.S. ; et al.

213-218, 1963.

Inspire Record 1407770 DOI 10.17182/hepdata.70346

None

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Charge-Exchange Scattering of 240-300 MeV π- Mesons on Hydrogen

Zinov, V.G. ; Korenchenko, S.M. ;

Sov.Phys.JETP 11 (1960) 1010-1015, 1960.

Inspire Record 1407581 DOI 10.17182/hepdata.70216

The results are given of the measurement of the differential cross sections of charge-exchange scattering of 240, 270, 307, and 333-Mev 1r- mesons on hydrogen.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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An Investigation of the $\pi + p \longrightarrow n + {\pi}^0$ Charge Exchange Scattering and the ${\pi}^{-} + p \longrightarrow n + {\eta}({\eta} {\longrightarrow} 2\gamma)$ Reaction in the 1.55-4.5 BeV/c Region

Barmin, V.V. ; Dolgolenko, A.G. ; Krestnikov, Yu.S. ; et al.

Sov.Phys.JETP 19 (1964) 102-106, 1964.

Inspire Record 1407540 DOI 10.17182/hepdata.70207

The rr- + p- n + rr0 charge-exchange scattering and the rr- + p- n + 1J ( 1J- 2y) reaction were investigated in 1.55-4.5 BeVIc region in a 17-liter propane-xenon bubble chamber. The total cross sections of both reactions were measured in this region. The angular distributions of the rr0 mesons in the charge-exchange reaction were obtained. The backward exchange-scattering cross sections du( rr- + p- n + rr 0 )ldQ were estimated.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Investigation of $\pi^- + p \rightarrow \pi^0 + n$ exchange scattering at 2.8. BeV/c

Barmin, V.V. ; Dolgolenko, A.G. ; Meshkovskii, A.G. ; et al.

Sov.J.Nucl.Phys. 4 (1967) 592-595, 1967.

Inspire Record 1407282 DOI 10.17182/hepdata.69980

None

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Forward $\pi^-p$ charge exchange scattering between 0.8 and 1.9 GeV

Borgeaud, P. ; Bruneton, C. ; Ducros, Y. ; et al.

Phys.Lett. 10 (1964) 134-137, 1964.

Inspire Record 1400914 DOI 10.17182/hepdata.31224

None

15 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Differential cross sections for backward π− p → nπ0 from 2.6 to 8 GeV/c

DeMarzo, C. ; Guerriero, L. ; Nicolini, C. ; et al.

Phys.Lett.B 56 (1975) 487-490, 1975.

Inspire Record 1389073 DOI 10.17182/hepdata.27860

We report differential cross sections for π − p → n π 0 in the backward hemisphere at incident momenta of 2.6, 3.5, 4.3, 6.0, and 8.0 GeV/c. We observe less pronounced structure than some previous measurements with a shallow dip displaced from that seen in π + p elastic scattering.

5 data tables

Table 1

'N'.

Table 2

'N'.

Table 3

'N'.

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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.

Measurement of pi- p ---> pi0 n in the vicinity of the eta threshold

Starostin, A. ; Prakhov, S. ; Nefkens, B.M.K. ; et al.

Phys.Rev.C 72 (2005) 015205, 2005.

Inspire Record 688197 DOI 10.17182/hepdata.25171

We report a new measurement of the differential cross section for π−p→π0n from pπ=649 to 752 MeV/c, which is around the opening of the η channel (685 MeV/c). Our data support the main features of the π−p charge-exchange differential cross sections generated by the SAID πN partial-wave analysis. The opening of the η channel has a clear effect on the shape of the excitation function for dσ(π−p→π0n), which is most noticeable in the backward direction.

9 data tables

Table 1

Differential cross section for incident pion momentum 649, 654 and 657 MeV.

Table 2

Differential cross section for incident pion momentum 661, 666 and 669 MeV.

Table 3

Differential cross section for incident pion momentum 673, 678 and 681 MeV.

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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.

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.

Analyzing power for pi- p charge exchange in the backward hemisphere from 301-MeV/c to 625-MeV/c and a test of pi N partial wave analyses

Kim, G.J. ; Arends, J. ; Engelage, J. ; et al.

Phys.Rev.D 41 (1990) 733-743, 1990.

Inspire Record 301242 DOI 10.17182/hepdata.22935

The analyzing power of π−p→π0n has been measured for pπ=301−625 MeV/c with a transversely polarized target, mainly in the backward hemisphere. The final-state neutron and a γ from the π0 were detected in coincidence with two counter arrays. Our results are compared with predictions of recent πN partial-wave analyses by the groups of Karlsruhe-Helsinki, Carnegie-Mellon University-Lawrence Berkeley Laboratory (CMU-LBL), and Virginia Polytechnic Institute (VPI). At the lower incident energies little difference is seen among the three analyses, and there is excellent agreement with our data. At 547 MeV/c and above, our data strongly favor the VPI phases, and disagree with Karlsruhe-Helsinki and CMU-LBL analyses, which are the source of the πN resonance parameters given in the Particle Data Group table.

7 data tables

Table 1

Axis error includes +- 5/5 contribution (Uncertainty in background normalisation).

Table 2

Axis error includes +- 5/5 contribution (Uncertainty in background normalisation).

Table 3

Axis error includes +- 5/5 contribution (Uncertainty in background normalisation).

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DIFFERENTIAL CROSS-SECTION FOR PI- P ---> GAMMA N FROM 427-MEV/C TO 625-MEV/C

Kim, G.J. ; Arends, J. ; Briscoe, W.J. ; et al.

Phys.Rev.D 40 (1989) 244-247, 1989.

Inspire Record 285141 DOI 10.17182/hepdata.23110

Differential cross sections for π−p→γn have been determined from 427 to 625 MeV/c, mainly at 90° and 110° c.m. The data were obtained by combining measurements of the Panofsky ratio in flight with known charge-exchange cross sections. The results are compared with γn→π−p data derived from γd experiments; the difference is typically 30%. The radiative decay amplitudes of neutral πN resonances are therefore uncertain by at least 30%.

3 data tables

Table 1

Charge exchange cross section from PWA.

Table 2

PI- P --> GAMMA N cross section.

Table 3

GAMMA N --> PI- P cross section calculated using detailed balance.

$\pi^- P$ Charge Exchange Analyzing Power From 547-{MeV}/c to 687-{MeV}/c

Wightman, J.A. ; Eichon, A.D. ; Kim, G.J. ; et al.

Phys.Rev.D 38 (1988) 3365-3374, 1988.

Inspire Record 270260 DOI 10.17182/hepdata.23237

The π−p charge-exchange analyzing power has been measured from 547 to 687 MeV/c in the center-of-mass angular range -0.9≤cosθ̃π≤0.9 using a transversely polarized target. The recoil neutron was detected in coincidence with a photon from π0 decay. The results are compared with the three recent partial-wave analyses (PWA’s); the VPI analysis is most consistent with our measured distributions except at 687 MeV/c where no PWA agrees with our data. The charge-exchange transversity cross sections are evaluated using the differential cross sections of Borcherding et al. These transversity cross sections are used in conjunction with earlier π±p data by our group to test the triangle inequalities which are a model-independent test of isospin invariance. Our data satisfy these inequalities everywhere; in contrast, Abaev et al. have reported a violation of more than 5 standard deviations at 685 MeV/c.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Analyzing Power for $\pi^- P$ Charge Exchange and a Test of Isospin Invariance Up to $\eta$ Threshold

Wightman, J.A. ; Eichon, A.D. ; Kim, G.J. ; et al.

Phys.Rev.D 36 (1987) 3529-3532, 1987.

Inspire Record 255689 DOI 10.17182/hepdata.23322

The analyzing power for π−p→π0n has been measured at five incident momenta from 547 to 687 MeV/c using a transversely polarized target. Data were obtained with scintillation counters at 10 angles simultaneously covering the range −0.9≤cosθc.m.π≤0.9. Our results and those of Kim et al. are used for a model-independent test of isospin invariance which is based on the triangle inequalities applied to the transversity-up as well as the transversity-down cross sections. No evidence is found of isospin violation.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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MEASUREMENT OF DIFFERENTIAL CROSS-SECTIONS FOR THE PI- P ---> PI0 N CHARGE EXCHANGE SCATTERING FROM 1969-MEV/C TO 2965-MEV/C

Suzuki, Y. ; Adachi, T. ; Daigo, M. ; et al.

Nucl.Phys.B 294 (1987) 961-978, 1987.

Inspire Record 255227 DOI 10.17182/hepdata.33477

Precise measurements of the differential cross sections on the π − p→ π 0 n charge exchange scattering have been performed at six incident beam momenta of 1969, 2172, 2370, 2569, 2767 and 2965 MeV/ c covering a wide angular range of −0.95 < cos θ π ∗ < 0.95, where θ π ∗ is an emission angle of π 0 meson in the c.m.s. The results are compared with predictions of recent partial wave analyses.

2 data tables

Table 1

Total cross sections obtained by fitting the Legendre polynomials to the DCS data.

Table 2

Statistical errors only. Cos(theta) bin width is +- 0.025.

MEASUREMENT OF POLARIZATION PARAMETERS FOR THE PI- P ---> PI0 N CHARGE EXCHANGE SCATTERING FROM 1965-MEV/C TO 4220-MEV/C

Minowa, M. ; Adachi, T. ; Daigo, M. ; et al.

Nucl.Phys.B 294 (1987) 979-1000, 1987.

Inspire Record 255228 DOI 10.17182/hepdata.33402

Polarization parameters for the π − p → π 0 n charge exchange scattering have been measured at eight beam momenta between 1965 and 4220 MeV/ c using two different experimental set-ups. The angular range covered is −0.90 < cos θ π ∗ < 0.95 at the five momenta of 1965, 2168, 2360, 2566 and 2960 MeV/ c , where θ π ∗ is the emission angle of the π 0 meson in the c.m.s.. For three momenta of 2770, 3490 and 4220 MeV/ c , the measurements cover the forward angles of 0.1 < cos θ π ∗ < 1.0 . The results are compared with the predictions of π N partial wave analyses.

4 data tables

Table 1

Polarisation measurements from SETUP1. Errors are statistical only.

Table 2

Polarisation measurements from SETUP2. Errors are statistical only.

Table 3

Legendre polynomial coefficients for fit to differential cross section data.

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PRECISE MEASUREMENT OF THE PION CHARGE EXCHANGE FORWARD DIFFERENTIAL CROSS-SECTION AT 522-MEV/C

Gaille, F.C. ; Highland, V.L. ; Auerbach, L.B. ; et al.

Phys.Rev.D 30 (1984) 2408-2410, 1984.

Inspire Record 215121 DOI 10.17182/hepdata.23596

A precise measurement of the differential cross section at zero degrees for the pion charge-exchange reaction π−p→π0n at pπ=522 MeV/c has been made. The result is dσdΩ (0∘)=4.32±0.11 mb/sr.

1 data table

Table 1

DIFFERENTIAL CROSS SECTION AT THETA = 0.

MEASUREMENT OF THE ASYMMETRY PARAMETER A IN PI- P ELASTIC AND CHARGE EXCHANGE SCATTERING AT PION ENERGIES T (PI) = 98-MEV, 238-MEV, 292-MEV, AND 310-MEV

Alder, J.c. ; Joseph, C. ; Perroud, J.p. ; et al.

Phys.Rev.D 27 (1983) 1040-1055, 1983.

Inspire Record 192365 DOI 10.17182/hepdata.23839

The asymmetry parameter A in π−p elastic scattering at incident pion laboratory kinetic energies Tπ of 98, 238, and 2922 MeV and in π−p charge-exchange scattering π−p→π0n at Tπ=238, 292, and 310 MeV have been measured over a wide range of scattering angles (typically from about 60° to 130° c.m.) with a polarized proton target. The data have been used in an energy-independent phase-shift analysis to improve the precision of the pion-nucleon phase shifts, to set new limits on violation of isospin conservation in the pion-nucleon S wave, and to confirm significant charge dependence in the P32 wave.

6 data tables

Table 1

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

Table 2

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

Table 3

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

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SMALL /t/ pi- p CHARGE EXCHANGE SCATTERING AT 40-GeV/c

The Serpukhov-Brussels-Annecy(LAPP) collaboration Binon, F.G. ; Davydov, V.A. ; Donskov, S.V. ; et al.

Z.Phys.C 9 (1981) 109, 1981.

Inspire Record 164809 DOI 10.17182/hepdata.13526

π−p→π0n differential cross-sections have been measured in the region of small 4-momentum transfer at 40 GeV/c incident momentum. The experiment performed at the IHEP 70 GeV accelerator makes use of a hodoscope γ-spectrometer. Thet- dependence of the cross-section points to a dominance of the spin-flip amplitude.

1 data table

Table 1

No description provided.

Study of the Charge Exchange Reactions $\pi^- p \to (\pi^0$, $\eta$, $\eta^\prime$) $n$ at 63-{GeV}

The ACCMOR collaboration Daum, C. ; Hertzberger, L. ; Hoogland, W. ; et al.

Z.Phys.C 8 (1981) 95, 1981.

Inspire Record 156266 DOI 10.17182/hepdata.49658

None

4 data tables

Table 1

INCLUDING SYSTEMATIC ERRORS.

Table 2

STATISTICAL ERRORS ONLY.

Table 3

STATISTICAL ERRORS ONLY.

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Polarization in Charge Exchange Reaction $\pi^- p \to \pi^0 n$ in Small Momentum Transfer Range at 40-{GeV}/$c$

Apokin, V.D. ; Avvakumov, I.A. ; Bagaturiya, Yu.Sh. ; et al.

Experientia Suppl. 38 (1981) 554, 1981.

Inspire Record 154047 DOI 10.17182/hepdata.11048

None

2 data tables

Table 1

AVERAGE TARGET POLARIZATION WAS 76 +- 3 PCT.

Table 2

No description provided.

CROSS-SECTIONS FOR PI- + P ---> N + (K) PI0 (K = 1 TO 5) AND PI- + P ---> N + ETA0 (ETA0 ---> 2 GAMMA) FOR INCIDENT PION MOMENTA BETWEEN 1.3-GEV/C AND 3.8-GEV/C

Crouch, H.R. ; Hargraves, R. ; Lanou, R.E. ; et al.

Phys.Rev.D 21 (1980) 3023-3058, 1980.

Inspire Record 158169 DOI 10.17182/hepdata.4334

This paper presents the results of a study of the dominant neutral final states from π−p interactions. The data were obtained in an experiment performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron, using a set of steel-plate optical spark chambers surrounding a liquid-hydrogen target. We present differential and total cross sections for the reactions (1) π−p→n+π0 and (2) π−p→n+η0(η0→2γ) and total cross sections for the reactions (3) π−p→n+kπ0 (k=2, 3, 4, and 5) and (4) π−p→all neutrals for eighteen values of beam momentum in the interval 1.3 to 4.0 GeV/c. The angular distributions for (1) and (2) have been analyzed in terms of expansions in Legendre polynomials, the coefficients for which are also given.

41 data tables

Table 1

No description provided.

Table 2

SIG = 4*PI*LEG(L=0).

Table 3

FORWARD DIFFERENTIAL CROSS SECTION CALCULATED FROM LEGENDRE POLYNOMIAL COEFFICIENTS AND ERROR MATRICES.

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Reaction $\pi^- p \to \pi^0 n$ in the 15-{GeV}/$c$ - 40-{GeV}/$c$ Momentum Range

The Serpukhov-CERN collaboration Apel, W.D. ; Augenstein, K.H. ; Bertolucci, E. ; et al.

Nucl.Phys.B 154 (1979) 189, 1979.

Inspire Record 140776 DOI 10.17182/hepdata.34746

A high statistics measurement of the reaction π − p → π 0 n has been performed at the Serpukhov accelerator for 15, 20, 25, 30 and 40 GeV/ c incident pion momentum using the NICE set-up with its associated 648-channel hodoscope spectrometer for γ-ray detection. More than 3 million charge-exchange events have been recorded in total. It is found that the spin-flip and non-spin-flip amplitudes can be parametrized, for small | t |, as exponentials with the same slopes to within a few percent. Also the behaviour of the differential cross section for small and medium | t | agrees with the prediction of a geometrical s -channel model which describes binary reactions in terms of a complex pole b 0 ( s ). The imaginary part of this universal pole, Im b 0 ( s ), has been determined and found to be growing logarithmically with s .

1 data table

Table 1

No data in this table.

Measurement of Differential Cross-Sections and Polarization Parameters for the $\pi^- p \to \pi^0 n$ Charge Exchange Scattering from 2.0 GeV/c to 4.25 GeV/c (talk, Abstract only)

Miyake, K. ; Nakamura, T. ; Kikuchi, R. ; et al.

599, 1979.

Inspire Record 150810 DOI 10.17182/hepdata.76255

None

11 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Reaction $\pi^- p \to \eta n$ in the 15-{GeV}/$c$ to 40-{GeV}/$c$ Momentum Range

The Serpukhov-CERN collaboration Apel, W.D. ; Augenstein, K.H. ; Bertolucci, E. ; et al.

Nucl.Phys.B 152 (1979) 1, 1979.

Inspire Record 133409 DOI 10.17182/hepdata.41487

A high-statistics measurement of the reaction π − p→ η n; η →2 γ has been performed at the 70 GeV Serpukhov accelerator for 15, 20, 25, 30 and 40 GeV/ c incident pion momentum using the NICE set-up with its associated 648-channel hodoscope spectrometer for γ-ray detection. It is found that the spin-flip and non-spin-flip amplitudes can be parametrized, for small | t |, as exponentials with the same slopes to within a few percent. For | t | ≳ 1 (GeV/ c ) 2 there is a break in the differential cross section. In addition, the A 2 effective trajectory deviates markedly for | t | ≳ 1 GeV/ c ) 2 from the linear behaviour valid for smaller | t |.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Polarization Measurements in $\pi^- p$ Charge Exchange Scattering From 617-{MeV}/$c$ to 2267-{MeV}/$c$

Brown, Robert M. ; Clark, A.G. ; Davies, J.K. ; et al.

Nucl.Phys.B 144 (1978) 287-311, 1978.

Inspire Record 130405 DOI 10.17182/hepdata.8173

Results are presented of polarization parameter measurements for the reaction π − p→ π 0 n at 22 momenta between 617 and 2267 MeV/ c . These results are generally in agreement with those of previous measurements and in qualitative agreement with predictions of phase-shift analyses. Together with the recently published differential cross-section measurements, they provide a comprehensive set of data for this reaction in the resonance region.

22 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurements of the pi- p --> pi0 n Forward Scattering Cross-Section in the Energy Region 400-MeV-600-MeV

Kravtsov, A.V. ; Kuzmin, L.A. ; Nemozhenko, O.N. ; et al.

Nucl.Phys.B 140 (1978) 279-284, 1978.

Inspire Record 135966 DOI 10.17182/hepdata.34984

The forward charge-exchange differential cross section has been measured using two Čerenkov spectrometers at five energies of incident pions. The resulting cross-section values are 4.02 ± 0.22, 3.61 ± 0.13, 4.19 ± 0.13, 3.91 ± 0.12, 3.02 ± 0.14 mb/sr at incident pion energies 400, 450, 500, 550 and 600 MeV, respectively. These values are in a good agreement with dispersion-relation predictions.

1 data table

Table 1

No description provided.

Investigation of pi- p --> pi0 n Reaction at Large Momentum Transfer

The Serpukhov-CERN collaboration Apel, W.D. ; Augenstein, K.H. ; Bertolucci, E. ; et al.

Phys.Lett.B 72 (1977) 132, 1977.

Inspire Record 121448 DOI 10.17182/hepdata.39780

New results on a high statistics measurement of pion-nucleon charge exchange scattering at 40 GeV/ c , extending in momentum transfer up to − t = 1.8 (GeV/ c ) 2 , are reported and compared with an optical impact parameter model, together with previous data for the reaction π − p → ηn at the same energy. The imaginary part of the pole trajectory b 0 ( s ) is determined from the slope of the tangent to the maxima of (−t) 1 2 d σ d t . The linear increase of Im b 0 ( s ) with log s , which has been observed at low energies, continues up to 40 GeV/ c .

2 data tables

Table 1

Table 2

AT SMALL -T, THE BINNING TENDS TO SMEAR OUT THE FORWARD DIP.

Real Parts of the Pion-Proton Forward Scattering Amplitude

Engelmann, T.R. ; Hendrick, R.E. ;

Phys.Rev.D 16 (1977) 2891, 1977.

Inspire Record 119142 DOI 10.17182/hepdata.75552

The most recent total-cross-section data are used to calculate real parts of the forward elastic π±p scattering amplitudes from threshold to 240 GeV/c. Using statistical and systematic uncertainties of the total cross sections and their momenta, along with uncertainties of the subtraction and coupling constants, unphysical cuts, and cross-section extrapolations, we calculate the uncertainties of the real amplitudes. Our results are compared to experimental and other theoretical determinations of the π±p forward real amplitudes.

240 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 in $\pi^{-}$p Charge Exchange Scattering from 620 to 2730-MeV/c

Brown, Robert M. ; Clark, A.G. ; Davies, J.K. ; et al.

Nucl.Phys.B 117 (1976) 12-49, 1976.

Inspire Record 110001 DOI 10.17182/hepdata.8341

Results are presented of differential cross-section measurements for the reaction π − p→ π 0 n; π 0 → γγ at 22 incident pion momenta between 618 and 2724 MeV/ c . The results are in good agreement with those of other experiments. They represent the first comprehensive set of high statistics measurements of the π − p charge-exchange differential cross section at closely spaced momenta in the resonance region.

31 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Pion Charge Exchange Scattering at High-Energies

Barnes, A.V. ; Mellema, D.J. ; Tollestrup, A.V. ; et al.

Phys.Rev.Lett. 37 (1976) 76, 1976.

Inspire Record 108646 DOI 10.17182/hepdata.21046

We report on a study of pion charge-exchange scattering carried out at Fermilab in the energy range 20 to 200 GeV. The results can be described remarkably well by a simple Regge-pole model. The charge-exchange cross sections in the forward direction lead to a prediction for the difference in total cross sections of π−p and π+p which is in satisfactory agreement with direct measurements of this difference in another experiment at Fermilab.

3 data tables

Table 1

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

Table 2

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

Table 3

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

The momentum dependence of the differential pion charge exchange cross section from 1.3 to 3.8 GeV/c

Kistiakowsky, V. ; Bastian, P. ; Brabson, B. ; et al.

Conference Paper, 1976.

Inspire Record 1408079 DOI 10.17182/hepdata.70407

None

18 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Polarization measurements in $π^−$p charge exchange scattering from 618 MeV/c to 2267 MeV/c

Brown, Robert M. ; Clark, A.G. ; Davies, J.K. ; et al.

AIP Conf.Proc. 35 (1976) 189-197, 1976.

Inspire Record 117337 DOI 10.17182/hepdata.76257

Results are presented of measurements of the polarisation parameter for the reaction π−p→π°n : π°→γγ at 22 incident momenta in the resonance region. These results are generally in agreement with those of previous measurements and in qualitative agreement with predictions of phase shift analyses.

22 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurements of the Polarization Parameter p, and the Differential Cross-Section, for pi- p --> pi0 n in the Resonance Region

Brown, Robert M. ; Clark, A.G. ; Davies, J.K. ; et al.

75-89, 1976.

Inspire Record 116148 DOI 10.17182/hepdata.76441

None

22 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Experimental Study and Phase Shift Analysis of the Reactions $\pi^{-} p$ $\rightarrow$ $\pi^{0}$ $\gamma \gamma n$ and $\pi^{-} p$ $\rightarrow$ $\eta \gamma \gamma n$ to the Incident Momenta of 0.757-GeV/c and 2.01-GeV/c

Feltesse, Joel ;

PhD Thesis, UPMC, Paris (main), 1975.

Inspire Record 108493 DOI 10.17182/hepdata.1306

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Backward pi- p Reactions Between 0.6-GeV/c and 1-GeV/c

Debenham, N.C. ; Binnie, D.M. ; Camilleri, L. ; et al.

Phys.Rev.D 12 (1975) 2545-2556, 1975.

Inspire Record 104820 DOI 10.17182/hepdata.24845

Measurements are reported of the differential cross section for the reaction π−p→π−p,π0n,andηn at three angles close to 180° and for incident momenta in the range 0.6 to 1.0 GeV/c. The three measurements were made simultaneously at 1% intervals of beam momentum. The data on elastic scattering resolve a discrepancy between two earlier experiments. They also show clearly the effect of the opening of the ηn channel. The charge-exchange data show that I-spin bounds are not violated in the kinematic region covered. The ηn data can be adequately described with known s-channel resonances. No evidence for narrow N*'s is seen in any channel.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

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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Inverse Pion Photoproduction in the Vicinity of the p33 (1232) Resonance and a Test of Time Reversal Invariance

Comiso, J.C. ; Blasberg, D.J. ; Haddock, R.P. ; et al.

Phys.Rev.D 12 (1975) 719, 1975.

Inspire Record 91072 DOI 10.17182/hepdata.24803

Differential cross-section measurements are presented for π−p→γn at five energies around the p33(1232) resonance. A detailed comparison is made with γn→π−p deduced from γd experiments. In general, the results are in support of detailed balance. Using the Christ-Lee-Donnachie-Shaw model, our new data indicate that the T-violating phase in the isovector part of the M1+ multipole is less than 2°, which is a very sensitive test of time-reversal invariance. No evidence is found for a possible isotensor component of the electromagnetic current. Our data are compared to various multipole analyses. In general, the agreement is poor.

11 data tables

Table 1

Axis error includes +- 6.3/6.3 contribution.

Table 2

No description provided.

Table 3

No description provided.

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Negative pion charge exchange scattering on protons in the momentum range 20-50 gev/c

Bolotov, V.N. ; Isakov, V.V. ; Kachanov, V.A. ; et al.

Nucl.Phys.B 73 (1974) 365-386, 1974.

Inspire Record 94656 DOI 10.17182/hepdata.32247

Differential cross sections for charge exchange π − p → π 0 n have been measured for momenta up to 50 GeV/ c . The cross section falls as a power of energy. The forward scattering cone shrinks with increasing energy. The cross section for charge exchange at zero angle drops with momentum as P −0.81±0.05 . The charge exchange cross section in the region of the second maximum decrease as P −2.8±0.1 . The ϱ trajectory is described by a linear function α ( t ) = 0.56 + 0.97 t in the interval 0 < − t -<1.5 (GeV/ c ) 2 .

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Measurement of high momentum transfer pi- p ---> pi0 n at 5.9 gev/c

Brockett, W.S. ; Corlew, G.T. ; Frisken, William R. ; et al.

Phys.Lett.B 51 (1974) 390-392, 1974.

Inspire Record 95079 DOI 10.17182/hepdata.27932

The differential cross section for π − p → π 0 n has been measured in the t range 1.8 ⩽ | t | ⩽ 8.2 (GeV/ c ) 2 by a counter-spark chamber experiment detecting the neutron and both π 0 decay photons. A broad minimum was found, centered at | t | = 5.2 (GeV/ c ) 2 .

1 data table

Table 1

No description provided.

Measurement of the pi- p ---> n pi0 and pi- p ---> n gamma differential cross-sections near the resonance p(11)(1460)

Cheze, J.B. ; Codreanu, N. ; Hamel, J.L. ; et al.

Nucl.Phys.B 72 (1974) 365-375, 1974.

Inspire Record 94658 DOI 10.17182/hepdata.7810

The π − p→n γ and π − p→n π ° differential cross sections have been measured for −0.9< cos θ ∗ <−0.45 (θ ∗ c.m. scattering angle) at 475 MeV/ c and 550 MeV/ c incident momenta. The π − p→n γ measurement is a good check of the detailed balance principle in the electromagnetic interactions of hadrons at these energies and is in good agreement with Walker's analysis. On the other hand the π − p→ π °n extrapolated values of 180° allows one to verify that the phases of the A 1 2 and A 3 2 amplitudes are equal.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

BACKWARD CROSS SECTION ESTIMATED BY LEGENDRE POLYNOMIAL FIT.

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Charge exchange scattering of pi- mesons on protons in the momentum range 20-50 gev/c

Bolotov, V.N. ; Isakov, V.V. ; Kakauridze, D.B. ; et al.

Yad.Fiz. 18 (1973) 1046-1060, 1973.

Inspire Record 95305 DOI 10.17182/hepdata.19174

None

1 data table

Table 1

No description provided.

Study of the reaction pi- p ---> pi0 n between 1.0 and 2.4 gev/c

Nelson, Jerry E. ; Chaffee, R.B. ; Dahl, O.I. ; et al.

Phys.Lett.B 47 (1973) 281-284, 1973.

Inspire Record 95427 DOI 10.17182/hepdata.38182

The differential cross section for the reaction π − p→n π ° has been measured with high statistics at six incident beam momenta between 1.0 and 2.4 GeV/ c . The results are compared with predictions of recent phase shift analyses and forward dispersion relations.

3 data tables

Table 1

No description provided.

Table 2

FROM EXTRAPOLATING THE LEGENDRE POLYNOMIAL FITS.

Table 3

THE LEGENDRE POLYNOMIAL FITS WERE CONSTRAINED IN THE EXTREME BACKWARD DIRECTION BY DATA AT THETA = 180 DEG FROM OTHER EXPERIMENTS.

A MEASUREMENT OF THE POLARIZATION PARAMETER FOR THE REACTION pi- p ---> pi0 n BETWEEN 1.03-GeV/c AND 1.79-GeV/c

Shannon, S.R. ; Anderson, L. ; Bridgewater, A. ; et al.

Phys.Rev.Lett. 33 (1974) 237, 1974.

Inspire Record 80604 DOI 10.17182/hepdata.21279

The polarization parameter for the reaction π−p→π0n has been measured at five incident been momenta between 1.03 and GeV/c. The results are compared with predictions of recent phase-shift analyses.

5 data tables

Table 1

Table 2

Table 3

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Measurement of the polarization parameter of the reactions pi- p ---> pi0 n and eta n at 5 and 8 gev/c

Bonamy, P. ; Borgeaud, P. ; Crozon, M. ; et al.

Nucl.Phys.B 52 (1973) 392-402, 1973.

Inspire Record 84261 DOI 10.17182/hepdata.50104

Measurements of the polarization parameter of the reactions π − p → π 0 n and π − p → η n at 4.90 and 7.85 GeV/ c and for a squared four-momentum transfer − t ranging from 0.1 to 2.0 (GeV/ c ) 2 have been achieved by using a butanol polarized proton target and detecting only the two γ's from the neutral meson decay. The background due to events involving bound protons has been separately measured and subtracted out. A large positive polarization has been found for the reaction π − p → π 0 n. It is consistent with other pion-nucleon scattering data connected by isospin conservation. The polarization for the reaction π − p → η n is not significantly different from zero within the large experimental errors.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Momentum dependence of the 180-degrees pi- p charge-exchange cross-section

Kistiakowsky, V. ; Feld, B.T. ; Triantis, F.A. ; et al.

Phys.Rev.D 6 (1972) 1882-1905, 1972.

Inspire Record 83145 DOI 10.17182/hepdata.3611

The π−+p→π0+n differential cross section at 180° has been measured for 52 values of π− momentum from 1.8 to 6.0 GeV/c using a constant-geometry detection system. The average statistical uncertainty is ∼5% and the systematic uncertainty is ∼10%. The details of the experiment and the data analysis are discussed. The data are compared with those of other experiments with which they are generally in agreement. One set of data disagrees with those presented here and a possible reason for this is discussed. A five-parameter fit of the predictions of a dual-resonance model to our data gave excellent agreement. The differential cross sections at 180° for π±p elastic scattering have been compiled and the moduli and relative phase of the T=12 and T=32 pion-nucleon s- and u-channel amplitudes (|A12|, |A32|, and cosδ) have a minimum at u=0.4 GeV/c and, in the s channel, a corresponding minimum at s=2.2 GeV/c.

53 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of polarization pn pi- p ---> pi0 n at 3.5 and 5.0 gev/c

Hill, D. ; Koehler, P. ; Novey, T. ; et al.

Phys.Rev.Lett. 30 (1973) 239-242, 1973.

Inspire Record 84552 DOI 10.17182/hepdata.21395

The polarization parameter P(t) for the reaction π−p→π0n has been measured at 3.5 and 5.0 GeV/c over the range 0.2<~−t<~1.8 (GeV/c)2. The two γ rays from the π0 decay were detected in a large lead-glass hodoscope. The results agree with the positive polarization values found in earlier Argonne National Laboratory data at −t<0.35 (GeV/c)2. P(t) drops to a small value near t=−0.6 (GeV/c)2 and remains the same out to t=−1.8 (GeV/c)2.

1 data table

Table 1

DATA POINTS MEASURED FROM SMALL GRAPH.

Date

Collaboration

Subject_areas

Phrases

Reactions Reset

Observables

CM Energies (GeV)

Authors