# Proper Time Determination

- ## Proper time t = LB MB/PB

##

- ## B boost PB = Pjet - Pfrag( + Pmiss )

##

- vtx + kinematics fragmentation
- Pmiss : E,P conservation (LEP/SLD)

## ~ 10 - 20 %

- ## Flight Length LB

## ~ 0.2-0.3 mm (<LB> ~ 3 mm)

##

- ## time resolution

  ~ 0.2 ps ( 70%) + 1. ps (30%)

##

I vtx

II vtx

B

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