ISSUES in ETF Hyunki Moon Special Meeting @ NTU Contents - - PowerPoint PPT Presentation

ISSUES in ETF

Hyunki Moon Special Meeting @ NTU

Contents

• Efficiency
• How to define
• Time resolution
• Noise and cross-talk
• Questions & conclusion

Efficiency

• Extreamly higher rate compared to ETM
• 300k for collision
• In perspective of CDCTRG
• # of ETF output in signal region / total # of events
• In perspective of GDL(maybe?)
• # of ETF output in signal region / # of events in signal region
• Which one should we use?

Continuum bkg come from higher rate and time window of ETF

Resolution

• Until now all resolution plots were comparison with ETM
• Now cdc tracking evt T0 is available
• Need validation of cdc wire hit timestamp and trg wire hit

timestamp are always same(someone did?)

• Using exp3,4 data
• Is GDL unpacker usable for this purpose?
• Using exp5,6 data
• ETF unpacked data available

Noise and crosstalk

• Currently masking whole SL is only option available
• Can be adjusted through VME
• No effective algorithm for now to reduce bkg.
• For solving crosstalk
• shutdown TS hit info when multiple TS hits in same clock & SL

appear?

Questions & conclusion

• Main purpose of ETF
• Y4S or low multiplicity?
• Current ETF seems not suitable for low multiplicity
• Will prepare resolution plots using offline T0
• Maybe from exp.5?
• Need one definition of ETF efficiency