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)