PI- P --> ETAPRIME N
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Comparison of the Differential Cross-sections for $\pi^- p \to \eta^\prime n$ and $\pi^- p \to \eta n$ at 8.45-{GeV}/$c$

Stanton, N.R. ; Edwards, K.W. ; Legacey, D. ; et al.
Phys.Lett.B 92 (1980) 353-357, 1980.
Inspire Record 8522 DOI 10.17182/hepdata.27193

The ratio R of the differential cross sections for π - p→ η ′n and π - p → η n has been measured with high statistics and small systematic errors at 8.45 GeV/ c . R is generally interpreted as the relative content of nonstrange, ground-state quarks in η' and η. We find that R decreases with increasing ⋎ t ⋎; however, extrapolation to t =0 gives R (0) = 0.672 ± 0.032 (statistical) ± 0.47 (systematic) for the dominant spin flip cross sections, and R (0) = 0.500 ± 0.035 for the spin non-flip, in excellent agreement with results at higher energy. An improved value of the branching fraction ( η '→ γγ )/( η '→all) of 0.0200 ± 0.0018 is obtained.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Search for neutral mesons near 1 gev/c-squared

Binnie, D.M. ; Camilleri, L. ; Carr, J. ; et al.
Phys.Rev.Lett. 32 (1974) 392-395, 1974.
Inspire Record 94572 DOI 10.17182/hepdata.21308

In a study of the missing-mass spectrum near 1 GeV in the reaction π−+p→MM+n at three incident momenta near 2 GeV, we find no evidence for the recently reported narrow neutral mesons at 940, 963, and 1033 MeV.

1 data table
Table 1

No description provided.


Results on the production cross-sections pi- p ---> neutrals and pi- p ---> chi0(2gamma) n at 3.8, 6, 8 and 12 gev/c

Apel, W.D. ; Auslaender, J. ; Mueller, H. ; et al.
Phys.Lett.B 46 (1973) 459-464, 1973.
Inspire Record 95163 DOI 10.17182/hepdata.28058

The ratio between the cross sections for the reactions π − p→ χ ↳ 2γ 0 n and π − p → η →2 γ n has been measured to be (2.4 ± 0.9) × 10 −2 , (2.1 ± 0.6) × 10 −2 and (2.8 ± 1.3) × 10 −2 at 3.8,6,8 and 12 GeV/ c incident momentum respectively.

1 data table
Table 1

ETAPRIME CROSS SECTIONS DEDUCED FROM THEIR RATIO TO ETA PRODUCTION, USING THE RESULTS OF O. GUISAN ET AL., PL 18, 200 (1965).


Observation of three narrow neutral mesons in the vicinity of 950 mev

Cheshire, D.L. ; Jacobel, R.W. ; Lamb, R.C. ; et al.
Phys.Rev.Lett. 28 (1972) 520-523, 1972.
Inspire Record 75535 DOI 10.17182/hepdata.21441

In a scintillation-counter experiment, we have observed two narrow, neutral mesons in addition to the well-established η′ (958) in the reaction π−p→M0n at 2.4 GeVc. We observe a mass of 940.5 ± 1.7 MeV, Γ<10.4 MeV for the M0(940), and a mass of 962.9 ± 1.7 MeV, Γ<5.9 MeV for the δ0.

1 data table
Table 1

CROSS SECTION OVERALL UNCERTAINTY (APART FROM ETA PRODUCTION) ABOUT 30 PCT.


X0 ---> 2gamma from pi- p ---> neutral meson + neutron at 3.8 gev/c

Apel, W.D. ; Auslaender, J. ; Mueller, H. ; et al.
Phys.Lett.B 40 (1972) 680-684, 1972.
Inspire Record 75664 DOI 10.17182/hepdata.28261

We report on a measurement for the branching-ratio X 0 → 2γ X 0 ar all. Our result is X 0 → 2γ X 0 → all = (2.9 ± 0.9)% .

1 data table
Table 1

BY COMPARISON WITH THE KNOWN ETA PRODUCTION CROSS SECTION.