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.

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$\pi^- P$ 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

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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

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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

DATA POINTS MEASURED FROM SMALL GRAPH.


Measurement of Polarization in $\pi^- p \to \pi^0n$ and $\pi^-p \to \eta n$

Drobnis, D.D. ; Lales, J. ; Lamb, R.C. ; et al.
Phys.Rev.Lett. 20 (1968) 274-278, 1968.
Inspire Record 942917 DOI 10.17182/hepdata.21731

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6 data tables

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