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Tau momentum for decay length

  1. Jun 1, 2015 #1


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    I'm looking for the momentum so that the decay length of a tau (mean lifetime ##t_{lft}=2.9 \times 10^{-13}s##) can be ##2mm##.
    I was wondering whether someone can use the formula I got:

    [itex] l_{lab}= t_{lab} u = \gamma u t_{lft} \Rightarrow pc= m \gamma u = m \frac{l_{lab}}{t_{lft}}[/itex]?

    (Looking just for a confirmation)
  2. jcsd
  3. Jun 1, 2015 #2


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    Looks reasonable.
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