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

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 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

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

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

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

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

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 events1

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

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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