The following Event Cuts have been incorporated into the analysis:

• |V_z| < 30cm
• V_x² + V_y² < 1cm from RMS values
• dN_ch/dη Cuts for Centrality
• Trigger ID: 86011 Min-Bias Trigger

Event Vertex Distribution in Z with a cut of ±30cm along the Beamline

Event Vertex Distribution transverse to the beam axis with a circle
cut of 1cm around the mean values of the distribution.

Track Selection has been made as follows:

• Using Primary Tracks
• Global DCA < 3.0cm
• P_t correction for energy loss made with π mass assumption
• Track refit with Event Vertex
• Number of Fit-Points > 24
• |y_particle|< 0.1 (particle = π±, K±, p, p)

The Centrality was determined utilizing a Glauber Model simulation performed by Dr. Jim Draper which reproduces the Cu+Cu 22 GeV Reference Multiplicity Distribution:

Cu+Cu 22 GeV Reference Multiplicty for TrigID 86011 and Glauber Model Simulation

Centrality Refmult Borders Centrality Reference Multiplicity 5% ≥ 86 10% ≥ 72 20% ≥ 51 30% ≥ 35 40% ≥ 24 50% ≥ 16 60% ≥ 10 70% ≥ 6 80% ≥ 4

Mean Refmult Centrality From Glauber From Refmult Npart Ncoll 0 - 5% 97.5 96.9 109 182 0 - 10% 87.9 87.3 5 - 10% 78.2 77.7 90 138 10 - 20% 60.4 60.0 70 100 20 - 30% 42.1 41.6 51 64 30 - 40% 28.7 28.2 35.5 40 40 - 50% 19.3 18.8 24 24 50 - 60% 12.4 11.8 60 - 70% 7.5 6.9 50 - 70% 9.95 13 12

Note: Online QA files can be found here (Select Run 5 from bottom, Select Run Period CuCu @ 22GeV from above and click on the select button to display runs.

TRIGGER:

Reference Multiplicity seperated by Trigger ID. As with the Au+Au 19.6 GeV Dataset, the ZDC trigger was of little use for triggering on central events (see below). The BBC-narrow trigger has been selected for this analysis.

BBC ADC Sum vs. ZDC ADC Sum

The normal distribution is not see here either since the ZDC does not have good rapidity coverage for the low energy Cu+Cu 22 GeV collisions.

CTB ADC sum Vs BBC ADC Sum

CTB adc sum vs. BBC adc sum

η DISTRIBUTION:

The pseudorapidity distribution is shown for top 10%, 10-20%, 20-30%... centralities.

Cu+Cu 22 GeV collisions had low enough luminosity that they shouldn't suffer from pile up events.
[Insert Rate Plot]

Secondary Vertices were not reconstructed however as we don't expect pileup this should not be an issue

Beam Pipe vacumm was good and beam pipe events were less than 1% of the dataset and only in the peripheral collisions. They can be eliminated with a Mean-Eta vs. CTB multiplicty Cut and/or a Mean-Eta vs. Refmult cut.

Momentum Resolution at Magnetic Field of 0.25T (source: TPC NIM Paper)

Momentum Resolution at Magnetic Field of 0.5T (source: Run4 AuAu 200 GeV Embedding P05ic)