Physics Analysis:

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AN Summary:

Event Selection


Pre selection

  • Event cleaning and trigger requirement
  • Exact one tight lepton, no additional loose lepton
  • At least 3 jets and one of them should be btagged(CSVM)
Signal Region 1 (SR1) N(gamma)=1
Signal Region 2 (SR2) N(gamma)≥2

SUSY Signal
MC Background
Run2 Data

CMS Service:

ECal Trigger:

-CMS DQM GUI guide:

To change the low and high interest parameters of TTF

TT flag is sent from the TCC to the SRP and included in the DCC for debugging purposes. The last two bits characterize the TT energy state, while the third bit is enabled if the TT flag was produced with error conditions.

TT Flag (binary) Description
000 Low interest TT (Tower Et (transverse energy) is bellow the low threshold)
001 Mid-interest TT (Tower Et is between the low and high thresholds)
010 Not used
011 High-interest TT (Tower Et is above the high threshold)
100 Force TT readout (Agilent sync link error )
101 Force TT readout (Hamming code error )
11x Force TT readout (Other error conditions )

The selective readout algorithm classifies the trigger towers of the ECAL into 3 classes using the Level-1 trigger primitives. The transverse energy Et deposited in each trigger tower is compared to 2 thresholds. Trigger towers with an energy above the higher threshold are classified as high interest trigger towers(TTF==3),then the crystals of this trigger tower and its neighbour trigger towers ( 9 trigger towers in total of 225 crystals in the barrel case) are read with no suppression. Those with the transverse energy between the 2 thresholds as medium interest(TTF==1), then the crystals of this trigger tower (25 crystals in the barrel case) are read with no suppression. And those with an energy below the lower threshold as low interest trigger towers(TTF==0) and it is not the neighbour of a high interest trigger tower, then the crystals in it are read with zero suppression at about 3σnoise.

In the following example, we want to set the High interest threshold to 2.5 GeV and Low interest threshold to 1.5 GeV. In TTF:

Et<1.5 Low Interest TTF=0
1.5 ≤ Et < 2.5 Medium Interest TTF=1
2.5 ≤ Et High Interest TTF=3

The first steps are the same as To_Load_the_New_Timing_Parameter

  • Log on to P5

  • This takes you to:
  • An example of script generating parameters:
  • dry run:
writeToDB = cms.bool(False),

  • To update OMDS (online database). Switch on the "writeToDB". And the DB will be updated.
writeToFiles = cms.bool(True),

  • Here we set the High interest: 2.5 GeV & Low interest: 1.5 GeV, change the parameters as the following lines:
 TTF_lowThreshold_EB = cms.double(1.5), ## EB Trigger Tower Flag low threshold in GeV
TTF_highThreshold_EB = cms.double(2.5), ## EB Trigger Tower Flag high threshold in GeV
TTF_lowThreshold_EE = cms.double(1.5), ## EE Trigger Tower Flag low threshold in GeV
TTF_highThreshold_EE = cms.double(2.5), ## EE Trigger Tower Flag high threshold in GeV
  • Execute the config below, then you will get the Output text file TPG_beamv6_trans_spikekill.txt (you can edit the output filename in the script as well) with the new TPG param updated

  • Open the Output file TPG_beamv6_trans_spikekill.txt to check the parameters, search for LUT until you find the lines below:
  • The last digit of each line shows the ADC counts, convert it to Et by mutiplying 0.5 GeV /ADC. The third digit from right is the TTF. So, 0x0 presents 0 ADC which converts to 0 GeV, goes to zere suppression region with TTF=0, here we omit the 0 (it should look like 0x000 by principle), 0x104 presents 4 ADC which converts to 2.0 GeV, TTF=1, and 0x305 presents 5 ADC which converts to 2.5GeV, TTF=3.
  • Why we have the same text printed four times? The original ADC are 10 digits binary with the last two digits for decimals part which have four possibilities .00, .01,.10, .11), while convert to Et, the decimal parts are left out, but each possibility still counts, so we get the "exact" same lines four times.

ECal upgrade simulation investigation:

Central computing shift:

-- FanXia - 2016-02-26

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Topic revision: r4 - 2016-03-08 - FanXia
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