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Cumulants Math

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Event loop

For each event, loop over hits and calculate a generating function

Calculate the statistical average of G

Cumulants generating function

PHOBOS Collaboration meeting (Inkyu Park)

0 1 2 3 4 5 6 7 8 9 10 11 12

Each sub-detector works independently

Detector ID

Run 6110, 8% flat flow, 0<Vz<4, 10K events, PMC primary tracks

PHOBOS Collaboration meeting (Inkyu Park)

Poisson Occupancy correction necessary

Backgrounds

Need MC estimation

primary hits

primary hits

all hits

all hits

PHOBOS Collaboration meeting (Inkyu Park)

- Using TPhMultHits with SpecVertex
- Poisson occupancy correction not yet done

Very similar shape to our very first plot of SymOct Flat MC analysis

PHOBOS Collaboration meeting (Inkyu Park)

- We understand better the cumulants method
- Amazingly, no need to fill Vtx, Spec holes. It works fine!
- Cumulants is not a magic box, it still sees all the pixel detector effects.
- Needs Poisson occupancy correction.
- Ring signals are suppressed by backgrounds hits.
- Hope to show Data soon

PHOBOS Collaboration meeting (Inkyu Park)