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Offline zero suppression

Offline zero suppression. Stephanie Beauceron LPNHE – Paris Calorimeter Task Force Workshop 10/07/2002. Aim : Look at the effect from the coarse hadronic on Missing E t Missing E t from cells with negative energy Runs studied: 163392 2.5  run online from 6 th of September

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Offline zero suppression

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  1. Offline zero suppression Stephanie Beauceron LPNHE – Paris Calorimeter Task Force Workshop 10/07/2002 • Aim : • Look at the effect from the coarse hadronic on Missing Et • Missing Et from cells with negative energy • Runs studied: • 163392 2.5 run online from 6th of September • 162594 1.5 run online from 25th of August and 2.5 offline • - 157713 2.5 run online from 20th of June single buffer mode

  2. Met and Set at 1.5 and at 2.5 on zero&minimum bias events Met Set 162594 1.5 online 162594 2.5 offline 163392 2.5 online Met is 3 times more importantin run 1.5. In run 1.5, there is 5 times more energy than in run 2.5. Mex Mey The run at 2.5 offline has values just on the middle of the 2 others.

  3. Met and Set with/without CH on 2.5 run From CH Without CH With CH From CH Without CH With CH Zero and Minimum Bias events QCD events Diminution of 1.2 GeV in Met, 10 GeV in Set & reduction of Mex,Mey

  4. Met and Set with/without CH on 1.5 run From CH Without CH With CH From CH Without CH With CH Zero and Minimum Bias events QCD events

  5. Conclusion on Coarse Hadronic… For zero and minimum bias events : at 1.5 the coarse hadronic energy represents 29% of total scalar ET at 2.5 the coarse hadronic energy represents 22% of total scalar ET Moreover, this variation is less important in QCD events… • Just adding more noise: Between minimum&zero bias events and QCD events we add ~4GeV in coarse hadronic for both 1.5 and 2.5. In the same time, the total scalar ET double between minimum&zero bias events and QCD events… So we add more noise than physics signal… Stephanie Beauceron LPNHE - Paris

  6. Energy cells distribution in zero and minimum bias events 162594 1.5 online Mean: 0.019 RMS: 0.241 163392 2.5 online Mean: 0.065 RMS: 0.297 162594 2.5 offline Mean: 0.042 RMS: 0.234 The mean value is positive but still a lot of cells with negative energy.

  7. Met resolutions for QCD events 162594 1.5 online 162594 2.5 offline 163392 2.5 online  Cells with positive energy  Cells with negative energy Similar variation between Met from negative/positive cells

  8. Met resolutions for QCD events 162594 1.5 online 162594 2.5 offline 163392 2.5 online  Cells with positive energy  All Cells  If we calculate with all cells, the missing ET is higher but the slope is smaller

  9. Conclusion Since some runs are not good  We have just one run at 1.5 and one at 2.5 close to each other… On Coarse Hadronic: There is some amount of energy in CH but much smaller than the noise especially at 1.5.  We should remove it. From negative energy cells: The missing ET from cells with negative energy is varying in the same way than missing ET from cells with positive energy. Stephanie Beauceron LPNHE - Paris

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