Motivation:

run 15 p+Au 200GeV

From QA of high-multi trigger with tofmult > 100,
https://drupal.star.bnl.gov/STAR/blog/yili/run15-pau-200gev-tof3vpdmb-5-vs-tof3vpdmb-30-trigger
https://drupal.star.bnl.gov/STAR/blog/yili/run15-pau-200gev-tof3vpdmb-30-trigger

there is large noise. In order to find the tofmult threshold triggerring high-mult events with less noise, vpd-5 MB data QA is studied here.

Production: fastoffline
Trigger name: VPDMB-5-ssd
Run: 16133001
Stream: ssdmb

Trigger details: online.star.bnl.gov/RTS/production/triggerApp.php


QA plot:


1. All vertices Vz vs online trigger VPDTACDiff




2. Default vertex

2.1. Vz




2.2. Vz vs vpdvz (btofheader)




2.3. Number of primary tracks vs online trigger tofmult

The following two are same variables with different tofmult range




Conclusion: at tofmult ~ 75 , Number of primary tracks reach the peak value and start to decreases as tofmult increases.


2.4 Number of primary tracks distribution

2.5 Number of Global tracks vs online trigger tofmult






3. Vertex Vz closest to the online trigger vpd vz

3.1. Vz




3.2. Vz vs vpdvz (btofheader)



3.3. Number of primary tracks vs online trigger tofmult

The following two are same variables with different tofmult range



Conclusion: at tofmult ~ 65 , Number of primary tracks reach the peak value and start to decreases as tofmult increases.

3.4 Number of primary tracks distribution


3.5 Number of Global tracks vs online trigger tofmult


4. Number of primary tracks for various online trigger tofmult ranges
4.1 default vz





4.2 vertex with largest Matched TOF tracks