关于e+e-annihilation的问题,牛人来.

关于e+e-annihilation的问题,牛人来.

In e-e+ collisons,two narrow resonances are oberved.one of mass 3.1GeV/c^2(the J) with width 0.093MeV,and a second of mass 3.7GeV/c^2 and width 0.337MeV.Calculate the lifetimes of these particles..

At higher e+e- collision energies still,a group of narrow resonances are seen at 9.46 GeV/c^2,10.02GeV/c^2 and 10.35GeV/c^2,and a much wider resonance is found at 10.57GeV/c^2.What can be learnt from these so-called gama resonnances?

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lefttime:tau_1=1/GAMMA_1=1/(0.093MeV)

tau_2=1/GAMMA_2=1/(0.337MeV)

第二个问题你需要知道什么?

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