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Analysis mtng. 29 th April 2008Measuring pz using the KEKSlide 1 TOF momentum reconstruction for the KEK data Analysis meeting, 15 April 2005 Mark.

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Presentation on theme: "Analysis mtng. 29 th April 2008Measuring pz using the KEKSlide 1 TOF momentum reconstruction for the KEK data Analysis meeting, 15 April 2005 Mark."— Presentation transcript:

1 Analysis mtng. 29 th April 2008Measuring pz using the TOFs @ KEKSlide 1 TOF momentum reconstruction for the KEK data Analysis meeting, 15 April 2005 Mark Rayner

2 Analysis mtng. 29 th April 2008Measuring pz using the TOFs @ KEKSlide 2 KEK tracker test geometry Tracker tilted at 3 degrees to the KEK beam –e+ and also mu+ and pi+ –Closely tuned to 250 MeV/c T1 and TOF can be used to try out t.o.f. p reconstruction Stray e- 250 MeV/c e+, mu+ and pi+ photons T1 timing counter Aerogels 5x5 TOF counter Tracker

3 Analysis mtng. 29 th April 2008Measuring pz using the TOFs @ KEKSlide 3 Time reconstruction in a TOF slab offset Measurement error ~N(0,35ps) Measurement error ~N(0,50ps) Correction to the offset l x PMT1PMT2 Read out (t 1 M, t 2 M ) Cable delay correction True time

4 Analysis mtng. 29 th April 2008Measuring pz using the TOFs @ KEKSlide 4 Time of flight T1  TOF 250 MeV/c, 8.3m ? Beta=1 Known t.o.f. Used to calibrate M=106 MeV/c2 Beta=0.916 Gamma=2.49 P=242 MeV/c

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