We have used the spin-precession technique to measure the Σ− magnetic moment (μΣ). A Σ− beam with a polarization of 22% was produced by a 400-GeV proton beam striking a Cu target at nominal production angles of ±3 mrad. We simultaneously recorded 21 000 Σ−→ne−ν¯ decays and 650 000 Σ−→nπ− decays at Σ− beam momenta of 253 and 308 GeV/c. We find μΣ=−1.166±0.014±0.010 nuclear magnetons, where the quoted errors are statistical and systematic, respectively.
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We have measured the production polarization of 265- and 310-GeV/c Σ− in the inclusive reaction p+Cu→Σ−+X using 400-GeV/c protons. The polarization was analyzed via the asymmetry in the weak decay Σ−→n+π−, and has typical values of +0.20 with respect to the direction of the cross product of the incident-proton and Σ− momenta. Using the spin-precession technique, we have determined the Σ− magnetic moment to be -1.23±0.03±0.03 nuclear magnetons, where the statistical and systematic errors are shown separately.
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The polarization and magnetic moment of the $\Sigma^+$ hyperon have been determined by analyzing 137,300 $\Sigma^+ \to p \pi^0, \pi^0 \to 2 \gamma$ decays. A beam of + inclusively-produced, polarized $\Sigma^+$ hyperons was generated in a Fermilab Meson Lab beamline by 400 GeV protons incident on a beryllium target. The $\Sigma^+$'s were produced at an angle of 5 mrad and ranged in momentum from 140 GeV/c to 350 GeV/c. + 0 The $\Sigma^+ \to p \pi^0, \pi \to 2 \gamma$ decays were detected by a multiwire proportional and drift chamber spectrometer with a lead glass array....
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Experimental data on the forward-backward asymmetry of π- emission in (d,4He,12C)181Ta interactions atp/A=4.2 GeV/c are presented. The absolute value of the asymmetry coefficient of the inclusive π- production in the nucleon-nucleonCMS decreases asAp−0.35 with increasing atomic mass of projectile nucleus. A method of obtaining the target-to-projectile ratio of the numbers of participant nucleonsNt/Np through measuring the velocity of the symmetric pion emission system is proposed. It has been found that Nt/Np∼Ap−0.73.
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IN THE NUCLEON-NUCLEON CENTRE-OF-MASS SYSTEM.
IN THE NUCLEON-NUCLEON CENTRE-OF-MASS SYSTEM.
The magnetic moment of the Ξ− hyperon has been measured to be μ(Ξ−)=−0.69±0.04±0.02 nuclear magnetons, where the uncertainties are statistical and systematic, respectively.
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The magnetic moment of the Ξ0 hyperon has been measured to be μΞ0=−1.253±0.014 nuclear magnetons. A new measurement of μΛ is also reported.
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The magnetic moment of the Λ0 hyperon has been measured to be μΛ=(−0.6138±0.0047)μN.
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Data from p+p→p+X at 102, 205, and 405 GeV and from π−+p→p+X at 205 GeV exhibit an approximate scaling property in the charged-prong multiplicity distributions as a function of the missing mass for the range 5<~MX<~13 GeV.
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