Experimental study of the inclusive η-spectrum from proton-antiproton annihilations at rest in liquid hydrogen
1989
The inclusive I·-momentum spectrum from Mathematical expression annihilations at rest in liquid hydrogen was measured at LEAR. Branching ratios were obtained for Mathematical expression, and I·I·(8.1±3.1)A10-5. An upper limit for Mathematical expression of 1.8A10-4 at 95% CL was found. The ratio of the branching ratios is BR(I·Ivariant)/BR(I·I)=0.51-0.06+0.20. For the ratio of branching ratios into two pseudoscalar mesons, we have BR(I·I0)/BR(I0I0)=0.65±0.14, BR(I·I·)/BR(I0I0), BR(I·I·â²)/BR(I0I0) at 95% CL, and BR(I·I·)/BR(I·I0). © 1989 Springer-Verlag.
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