Commissioning of eemcCalibration trigger

  • used all 77K events from STAR DAQ run #5054054,55,68; trigger eemcCalibration, nominal cut CTBsum <400
  • CTB sum spectrum from the actual trigger shows unsuppressed peak at zero and some leftovers at high multiplicity, 20K events processed


  • a reference CTB sum spectrum from the 20K of minB data


  • pi0 from 77K eemcCalib-trigger data with the following cuts applied:
    - CtbSum in [80,400] , seed thr=0.8 GeV, discarded hot towers 11TD09 and 09TB06
    - accepted 14K out of 77K input events.
    - pi0 yield :
    Npi0=175 + / - 32 , s2b=0.41 + / - 0.026 for invm=[0.07, 0.22]

  • pi0 from 77K eemcCalib-trigger data with the following cuts applied:
    - CtbSum in [20,80] , seed thr=0.8 GeV, discarded hot towers 11TD09 and 09TB06
    - accepted 9.3K out of 77K input events.
    - pi0 yield :
    Npi0=17 + / - 9 , s2b=0.57 + / - 0.132 for invm=[0.07, 0.22]