Offline zero suppression
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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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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


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.


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


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


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


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.


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


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


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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