Mastering Physics with Pearson eText -- Standalone Access Card -- for Essential University Physics (3rd Edition)
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Chapter 39, Problem 40P
To determine

Which decay is mediated by the weak force.

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TheΥmeson,bbˉ, is the bottom-quark analog to theψ,ccˉ. Its mass is9460MeV/c2, and its lifetime is1.5×10−20sec. From this information, what can you say about the mass of the B meson,ubˉ? (The observed mass is5280MeV/c2.)
One mediator of the weak interaction is the Z0 boson, with mass 91 GeV/c2. Use this information to find the order of magnitude of the range of the weak interaction.
A proton and an antiproton collide head-on, with each having a kinetic energy of 7.00 TeV (such as in the LHC at CERN). How much collision energy is available, taking into account the annihilation of the two masses? (Note that this is not significantly greater than the extremely relativistic kineticenergy.)
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