None
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DATA FOR EVENTS WITH ONE CUMULATIVE PI-.
DATA FOR EVENTS WITH TWO OR MORE CUMULATIVE PIONS.
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Evidence for the backward production of the B(1235) meson in the final state π+p→pfπ+ω at 11.46 GeV/c with σ(|u′|<1.5 GeV2)=1.28±0.26 μb is presented. When nucleon exchange is assumed to dominate, estimates for the SU(3) mixing parameter FD as well as the B coupling to the nucleon-antinucleon are given. Some indication of a narrow enhancement at M(π+ω)≃1.03 GeV/c2 is seen, but confirmation of this as a resonant state is not yet possible.
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None
ONE PION.
ONE PION.
ONE PION.
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DATA FOR PIONS WITH MAXIMUM VALUE OF E*(1-COS(THETA))/W IN EVENT.
DATA FOR PIONS WITH MAXIMUM VALUE OF E*(1-COS(THETA))/W IN EVENT.
E*(1-COS(THETA))/W IS MAXIMUM OF THIS VALUE FOR ALL PIONS IN EVENT. PIONS WITH MAXIMUM VALUE OF E*(1-COS(THETA))/W IN EVENT ARE EXCLUDED FROM DATA.
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None
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THE MOST RAPID PIONS WERE EXCLUDED.
We have identified 262 doubly tagged two-photon events. A subset of the data shows an enhancement of 21 events in the inclusive two-photon mass squared distribution between 0.8 and 2.2 GeV 2 . If these events result from spin 2 resonance production then Γ γγ = 9.5 ± 3.9 ± 2.4 keV (statistical and systematic). From another subset of 58 events in which the final state could be classified we determine the two-photon hadron to muon cross section ratio R γγ = 1.1 ± 0.3 ± 0.3.
ELECTRON BEAM ENERGIES OF 3.0 AND 3.6 GEV.
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