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Paweł Staszel Jagiellonian University

RICH efficiency versus p/p th - merging low and high field settings Incorporating different inefficiency components => RichInefficiencyModule. Paweł Staszel Jagiellonian University. At high fields inefficiencies for A and B polarities are different.

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Paweł Staszel Jagiellonian University

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  1. RICH efficiency versus p/pth - merging low and high field settingsIncorporating different inefficiency components => RichInefficiencyModule Paweł Staszel Jagiellonian University

  2. At high fields inefficiencies for A and B polarities are different It is due to different pion+kaon and proton contributions

  3. Extracting pions+kaon and protoninefficiency (1)‏ All coefficients are known, so, this set of equations can be solved in respect to fπ and fp for each momentum bin

  4. Results for 2A3450 + 2B3450 Cut on x-slope makes the inefficiencies free from “geometrical” effect allowing to extract pure “gamma factor” inefficiency

  5. Results for all possible settings Rich vs Tof2 X-slope>0.01 => pure “gamma factor” effect

  6. Fitting low and high part of p/pth Ordinary exponent with build-in matching to low p/pth Usual inefficiency formula

  7. Zoom in at low p/pth

  8. Zoom in at high p/pth

  9. Strategy for RichEfficiencyModule We have to deal with 3 effects: 1. “gamma factor” effect Eγ 2. “x-slope (geometrical)” effect Eg 3. two track resolution effect Er It is fair to assume that these effects are independent, if so, the total efficiency is a product of individual efficiencies: For small inefficiencies: But in general: See attached note on two track resolution

  10. Problem: not all fsTrack are reconstructed Using condition #T5tracks = 1 versus no condition on #T5Tracks give small effect because usually #fsTracks = #T5Tracks, Events with #T5Tracks > 1 (#T5Tracks=2) looks similar to events with #fsTracks==2.

  11. Same effect at high fields (2 deg)‏

  12. Same effect at high fields (4 deg)‏ Possible strategies: 1) add x/y - slope info for each T5 track and redo dsts 2) apply an average efficiency related to two track resolution determined from events with #fsTracks=2.

  13. How to use RichEfficiencyCalculator The calculator is in banapp/corrections/efficiency RichEfficiencyCalculator* richEffCal=new RichEfficiencyCalculator(“run04”,”auau”,”200”); richEffCal->Init(); in event loop: richEffCal->CalculateEffectiveEfficiencies(multi,d12,d13,d23); (see attached note)‏ if track loop: Float_t InEff = richEffCal->GetInEffic(i,t5ax,p/pth); or Float_t Eff = richEffCal->GetEffic(i,t5ax,p/pth);

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