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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.

3 data tables match query
Table 3

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

Table 4

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

Table 5

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


Recoil Proton Polarization in $\pi P$ Elastic Scattering at 547-{MeV}/c and 625-{MeV}/c

Seftor, C.J. ; Adrian, S.D. ; Briscoe, W.J. ; et al.
Phys.Rev.D 39 (1989) 2457-2463, 1989.
Inspire Record 282265 DOI 10.17182/hepdata.23234

The polarization of the recoil proton in π+p and π−p elastic scattering using a liquid-hydrogen target has been measured for backward angles at 547 and 625 MeV/c. The scattered pion and recoil proton were detected in coincidence using the large-acceptance spectrometer to detect and analyze the momentum of the pions and the JANUS polarimeter to identify and measure the polarization of the protons. Results from this experiment agree with other measurements of the recoil polarization, with analyzing-power data previously taken by this group, and with predictions of partial-wave analyses.

2 data tables match query
Table 1

No description provided.

Table 2

No description provided.


$\pi^- P$ 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.

1 data table match query
Table 1

No description provided.


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.

3 data tables match query
Table 3

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

Table 5

Axis error includes +- 5/5 contribution (BACKGROUND SUBTRACTION).

Table 6

Axis error includes +- 5/5 contribution (BACKGROUND SUBTRACTION).


Measurement of Asymmetry of Photoproduction of Positive Pions on Protons by Linearly Polarized Photons in 250-MeV-500-MeV Energy Range

Ganenko, V.B. ; Gorbenko, V.G. ; Derkach, L.M. ; et al.
Yad.Fiz. 23 (1976) 100-106, 1976.
Inspire Record 113097 DOI 10.17182/hepdata.19093

None

3 data tables match query
Table 10

No description provided.

Table 11

No description provided.

Table 12

No description provided.


Investigation of polarization of the photoprotons from the c-12 nucleus at the gamma-quanta energy of 550-715 mev

Goncharov, N.V. ; Derebchinskii, A.I. ; Zybalov, A.A. ; et al.
Yad.Fiz. 14 (1971) 673-675, 1971.
Inspire Record 69410 DOI 10.17182/hepdata.19273

None

2 data tables match query
Table 1

No description provided.

Table 2

No description provided.


Angular distributions of the asymmetry of the gamma p ---> p pi0 reaction with the gamma-quanta energies of 400, 450, 500, 550, 650 mev

Ganenko, V.B. ; Gorbenko, V.G. ; Zhebrovskii, Yu.V. ; et al.
Yad.Fiz. 20 (1974) 356-358, 1974.
Inspire Record 95035 DOI 10.17182/hepdata.19140

None

3 data tables match query
Table 8

No description provided.

Table 9

No description provided.

Table 10

No description provided.


Proton Polarization in gamma p --> pi0 p Reaction at an Angle of Theta (pi) = 100-Degrees in CMS in the Second pi n Resonance Region

Derebchinsky, A.I. ; Zybalov, A.A ; Konovalov, O.G. ; et al.
Yad.Fiz. 28 (1978) 265-266, 1978.
Inspire Record 135482 DOI 10.17182/hepdata.19013

None

1 data table match query
Table 1

No description provided.


Measurement of the polarization parameter in $\pi^{pm}p$ scattering from 356 to 519 MeV/c

Gorn, W. ;
LBL-1320, 1973.
Inspire Record 923202 DOI 10.17182/hepdata.1150

None

6 data tables match query
Table 2

No description provided.

Table 3

No description provided.

Table 4

No description provided.

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Polarization of Recoil Protons from Neutral Pion Photoproduction

Lundquist, D.E. ; Anderson, R.L. ; Allaby, J.V. ; et al.
Phys.Rev. 168 (1968) 1527-1533, 1968.
Inspire Record 54507 DOI 10.17182/hepdata.26510

The polarization of recoiling protons from the photoproduction of π0 mesons on liquid hydrogen has been measured for primary photon energies between 500 and 1000 MeV over a range of π0 c.m. angles from 55° to 130°. The results show structure not observed previously in experiments of less precision. In particular, the polarization at 90° c.m. is close to zero at a primary photon energy of 900 MeV. Also, a strong dependence of polarization on π0 c.m. angle between 600 and 900 MeV was observed. A subsidiary measurement of the polarization of the recoil protons from elastic e−p scattering at 900 MeV and q2=10 F−2 gave a value (1.3±2.0)%.

1 data table match query
Table 1

No description provided.