Expected hyperon polarization in Pb-Pb@5.5 TeV collisions, together with its expected statistical uncertainty in run 3/4, as compared to ALICE Pb-Pb@2.76 TeV measurement as well as to STAR results.
1. The STAR points are from Nature 548 (2017) 62.
2. The yellow point is from ANA-3435: https://alice-notes.web.cern.ch/node/557
3. To obtain value of the green point, ratio polarization-to-v1-slope vs collision energy was calculated and fitted with a constant. Then that constant was multiplied by v1 slope at 5.02 TeV (ANA-3901, https://alice-notes.web.cern.ch/node/620). It was also assumed that polarization at 5.02 TeV and 5.52 TeV is the same.
4. To obtain uncertainty of the green point, the uncertainty from 5.02 TeV polarization measurement ( ANA-3954, https://alice-notes.web.cern.ch/node/632) was scaled by 1/sqrt(1000), where 1000 is the expected increase in statistics in run 3/4. It was assumed that a) ALICE will have same V0 reconstruction efficiency, b) ZDC will have same event plane resolution.
More details:
https://indico.cern.ch/event/660171 (Alex Dobrin's talk)