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## PowerPoint Slideshow about ' Physics Pulse Shapes' - karif

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Reminder: FIR coefficients

- Our final calibration depends on the Filters used
- We are using a simplified set of coefficients
- Suggested by David Hadley
- Based on calibration pulse shapes
- Big question: do calibration pulses = physics pulses
- FIR coefficient sets
- EM layer: 1, 8, 13, 10, 7
- Hadronic layer: 1, 9, 15, 11, 5
- FCAL (all layers): 0, 2, 13, 5, 0

Physic Pulse Shapes

Analysis ‘technique’

- Raw data from run 160800
- About 5 luminosity blocks of Jet/Tau/Etc stream
- Start of fill, so high luminosity
- Lots of big pulses
- Use only pulses with maximum FADC > 60
- Similar to timing analysis cuts
- Average pulse shape by (major) partition
- EMB, EMEC, HEC, Tile, FCAL
- As always FCAL has the last laugh…

Physic Pulse Shapes

Hadronic layer

HEC pulses

(marginally)

narrower

(n-2) sample

close to zero

For HEC

Tile almost

perfect

Physic Pulse Shapes

FCAL – the joker in the pack

ALL pulses

are wider

FCAL2+3

(hadronic) are

particularly wide

Physic Pulse Shapes

Conclusions

- Differences between calibration and physics pulses will distort FADC to LUT energy conversion
- Will eventually require recalibration of LUT slopes
- Also maybe re-evaluation of FIR coefficients
- For the future (but when?)
- Main effects for now should be:
- Tile is about right
- EM will be underestimated in LUT value
- FCAL will be overestimated in LUT value
- Is this all backed up by Yuriy/Juraj’s observations?

Physic Pulse Shapes

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