# Problem: In beta decay, a down quark decays into an up quark, releasing a W  - boson. There isn't enough energy in the different in rest mass between the two quarks, so the W- boson produced is known as a "virtual particle" -- a particle produced by "borrowing" energy for a short amount of time. If the mass of the W- boson is 80.4 GeV/c2, how long can it exist for?

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In beta decay, a down quark decays into an up quark, releasing a W  - boson. There isn't enough energy in the different in rest mass between the two quarks, so the W- boson produced is known as a "virtual particle" -- a particle produced by "borrowing" energy for a short amount of time. If the mass of the W- boson is 80.4 GeV/c2, how long can it exist for?