The NA48 Detector - KEK
Transcript of The NA48 Detector - KEK
The NA48 Detector
● Physics motivation● Experimental overview● Details:
● The beams● The tagging detector● Charged mode detection● Neutral mode detection● Triggers and data acquisition
● Summary
Systematics
● NA48 design to make a precision measurement● Collect lots of statistics● Minimize possible systematic effects
Really measure what you want to measure!
Precision
● Want to measure something to 0.1% accuracy● Even for an easy measurement, not simple
● your height● your weight● how long this talk takes
● Need a well designed experiment
Now see slides in file intro.ps
Measurement Principles
● Measure double ratio of event numbers● Take data simultaneously in all four modes● Take data from same fiducial volume
● Analysis in bins of kaon energy
● KL events weighted to K
S decay distribution
Now see slides in file tagger.ps
Now see slides in file spectro.ps
Now see slides in file calor.ps
Direct CP Violation Exists!
Further Reading
Eur. Phys. J. C 22, 231-254 (2001)Physics Letters B544, 97-112 (2002)