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

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

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

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POLARIZED CROSS-SECTION MEASUREMENTS FOR THE REACTION PI- P ---> ETA N FROM 1171-MEV/C TO 2267-MEV/C AND A PARTIAL WAVE ANALYSIS OF THIS REACTION IN THE RESONANCE REGION

Baker, R.D. ; Brown, Robert M. ; Clark, A.G. ; et al.
Nucl.Phys.B 156 (1979) 93-110, 1979.
Inspire Record 146768 DOI 10.17182/hepdata.34678

Polarized cross sections for the reaction π − p → η n have been measured at 12 incident momenta between 1171 and 2267 MeV/ c . The data show that the polarization is small in the forward direction and there is a general trend for it to be large and positive near cos θ ∗ = 0.2 . These are the first published results on polarization effects in this channel in the resonance region. An energy-dependent partial-wave analysis has been performed and the couplings and branching fractions for decays of nucleon resonances to this channel are presented.

12 data tables

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DIFFERENTIAL CROSS-SECTIONS FOR THE REACTION PI- P ---> ETA N BETWEEN 724-MEV/C AND 2723-MEV/C

Brown, Robert M. ; Clark, A.G. ; Duke, P.J. ; et al.
Nucl.Phys.B 153 (1979) 89-111, 1979.
Inspire Record 146579 DOI 10.17182/hepdata.34682

Differential cross sections for the reaction π − p→ η n at 20 incident pion momenta between 724 and 2723 MeV/ c are presented. The results are compared with previous measurements. The data show clear evidence of non-zero couplings of this channel to known I = 1 2 , S = 0 baryon resonances with masses up to 2000 MeV/ c 2 .

22 data tables

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