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• Why FAST?
• How FAST?

• measure the muon lifetime tm to a precision of 1
  ppm ( 2 ps)
• measure the Fermi coupling constant GF to a
  precision of 1 ppm
• one order of magnitude improvement of the
  present world average

p ? m ? e p ? m (tp 26.03 ns -
PDG2002) m ? e (tm 2.197 ms - PDG2002)
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FAST target the story
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FAST target the end of the story !
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I
P
S
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PSI 15 December 2003
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ANY serious analysis on these data but it
really looks like a lifetime plot !!!
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FUTURE PLANS

• 1. DECEMBER 2003
• trigger prototype (from CIEMAT Madrid)
• Implement
• Test
• Take some data

2. 2004 first real data taking run (from
April on)