A Precise Measurement of the Decay Rate

Agenda

The standard model of electroweak interactions

Conserved Vector Current Hypothesis

Test of electroweak SM

Present limits for coupling constants GV and GA

Pion-Beta Decay

Previous Experiments

Previous Experiments

Pion-Beta Experiment at PSI

Pion-Beta Experiment at PSI

Kinematics

Backgrounds

Pion-Beta Detector

Shower development

Pion-Beta Detector

Pion-Beta Detector

Pion-Beta Detector

pE1 Beamline at PSI

Clustering scheme

Electronics

Trigger and background rates

Domino Sampling Chip

Beam test results

Calibration of the CsI calorimeter

Positron response

p+ ® e+n and Michel events

Gamma response with p-p ® p0n

Gamma response

Gain calibration

Cosmic Ray Tomography

Status end of ‘96