Global polarization of Lambda and anti-Lambda hyperons in Pb-Pb collisions at 2.76 and 5.02 TeV is consistent with zero, with an average of about 0.01 percent plus or minus 0.06 percent statistical uncertainty.
Acceptance effects in the hyperons global polarization measurement
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abstract
The possible sources of systematic uncertainties in the hyperons global polarization measurement are discussed. The equation with detector acceptance effects taken into account is provided. Contribution of the hyperons directed flow into the hyperons global polarization measurement is shown. The systematic uncertainties of the Lambda hyperons global polarization measurement in Au+Au collisions with the STAR detector at RHIC are calculated.
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Global polarization of $\Lambda$ and $\overline{\Lambda}$ hyperons in Pb-Pb collisions at the LHC
Global polarization of Lambda and anti-Lambda hyperons in Pb-Pb collisions at 2.76 and 5.02 TeV is consistent with zero, with an average of about 0.01 percent plus or minus 0.06 percent statistical uncertainty.