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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)

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# Tau momentum for decay length

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