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five FAST minutes … Why FAST? How FAST? measure the muon lifetime   to a precision of 1 ppm (~ 2 ps) measure the Fermi coupling constant G F to a precision.

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Presentation on theme: "five FAST minutes … Why FAST? How FAST? measure the muon lifetime   to a precision of 1 ppm (~ 2 ps) measure the Fermi coupling constant G F to a precision."— Presentation transcript:

1

2 five FAST minutes …

3 Why FAST? How FAST? measure the muon lifetime   to a precision of 1 ppm (~ 2 ps) measure the Fermi coupling constant G F to a precision of 1 ppm one order of magnitude improvement of the present world average ++ DC pion beam p = 170 MeV/c Active scintillator target Hight granularity  +   +  e +  +   + (   = 26.03 ns - PDG2002)  +  e + (   = 2.197  s - PDG2002) 1 ppm precision 10 12 events 10 12 x 9  / 0.5 ~ 1.5 y PARALLELISATION NEEDED HIGH DATA RATE (1MHz beam rate) ~ 80 MB/sec ONLINE ANALYSIS estimated efficiency

4 FAST target: the story …

5 FAST target: the end of the story !

6 P S I

7 PSI – 15 December 2003 phomultipliers preamps discriminators ventilators tdcs back view

8 time resolution with straight tracks ~ 1 ns time distribution RF frequency ~ 20 ns

9 ANY serious analysis on these data … … … but it really looks like a lifetime plot !!!

10 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) BUON NATALE e BUON ANNO !!!!

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