[Halld-level1] [New Logentry] Correlations between different triggers

[somov at jlab.org]

Logentry Text:
--
I started looking on correlations between different trigger types. As an example, reconstructed
rho meson candidates were considered

Event selection:

- select 3-track final state

- use dEdx to identify proton

- match tracks with clusters in calorimeter;
  require no energy in the calorimeter 
  except those released by tracks


Triggers considered:

bit 1:     10 FCAL + 2 BCAL > 18000

bit 6:    20 FCAL + 1 FCAL > 36000

bit 7:    ST + FCAL (900)    Prescaled factor 2
                              

---------------------------------------------
Runs 11554, 11555


1) Efficiency for different BCAL energies

  N (bit 6) / N (bit 1) = 93 % 


2) Compare ST + FCAL and the production trigger 

  N (bit 7) / N (bit 1) = 94 %


3) Trigger correlations


  a. Trigger with ST & FCAL, check FCAL & BCAL trigger 

     N (bit 7) / N (bits 7 & 1) = 97 %

  b. Trigger with FCAL & BCAL, check ST & FCAL
    
     N (bit 1) / N (bits 1 & 7) = 92 %

     - ST efficiency is not taken into account

     - timing has not been fine-tuned



  
Plots:
-----

Fig 1 

Top Left: invariant mass distribution for pi+ pi- candidates
acquired with the production (bit 1) and complementary 
trigger (bit 6).

Top Right: ratio of events acquired with these triggers
as a function of the reconstructed beam energy 
(E (REC) - mp) 

Bottom plots: comparison of the FCAL & BCAL and 
ST & FCAL triggers


Fig 2.

Ratio of events acquired with the trigger (bit 7 & bit 1)
and the production trigger (bit 1) as function of the 
reconstructed beam energy 

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3411357
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