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CROSS SECTIONS VERY SENSITIVE TO BACKGROUND SUBTRACTION.
Helicity conservation in the reaction π − p → pA 1 at 4.45 GeV/ c has been studied using 50 cm and 55 cm liquid hydrogen bubble chambers. In the Jackson and the helicity frames the dependence of the ϱ matrix elements on the four-momentum transfer squared to the proton ( t ) for A 1 maximum decay has been calculated. The obtained data are in a good agreement with t -channel helicity conservation. The t -channel dependence of the ϱ matrix elements in the mentioned frames is in good agreement with that calculated using the Regge π-pole exchange model (it is suggested that the A 1 maximum nature is explained by a kinematical effect of the Deck type).
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ALLOWING FOR 65 PCT BACKGROUND.
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RUN ONE.
RUN TWO.
RUN THREE.
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FROM MAXIMUM LIKELIHOOD FIT TO PARAMETRIZATION OF RESONANCE PRODUCTION CHANNELS.
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MULTIPLICITIES OF PI0 WAS OBTANED FROM MULTIPLICITIES OF GAMMAS: MULT(PI0)=MULT(GAMMA)/2.
PI- NUCLEON= (PI- P + PI- N)/2.
PI- NUCLEON= (PI- P + PI- N)/2.
The cross sections for e + e − → hadrons, e + e − , μ + μ − have been measured in the vicinity of the J Ψ resonance using the BES detector operated at BEPC. The partial widths for J Ψ to hadrons, electrons, muons and the total width have been determined to be Γ h = 74.1 ± 8.1 keV, Γ e = 5.14 ± 0.39 keV, Γ μ = 5.13 ± 0.52 keV, and Γ = 84.4 ± 8.9 keV, respectively.
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