A time-of-flight (TOF) detector is a particle detector which can discriminate between a lighter and a heavier elementary particle of same momentum using their time of flight between two scintillators[1].
The first of the scintillators activates a clock upon being hit while the other stops the clock upon being hit.
then the time of flight difference is given by where
The approximation is in the relativistic limit at momentum
denotes the speed of light in vacuum.
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