t detection efficiency

• Decays outside Pb (1 mm) egap ~ 0.50

(egap depends on beam features)

0.87 (t ® m)

• Kink finding efficiency ekink 0.84 (t ® e)

0.89 (t ® h)

determined by the angular cuts:

(resolution) 20 < qkink < 500 mrad (scanning & bg rejection)

• BR t ® m, e, h 0.174 , 0.178 , 0.498

• Fiducial cuts & alignment egeom ~ 0.93

Total efficiency for the 1-prong channels: 0.36

(3p channel under study)

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