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

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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
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?

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
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?

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 关于e的计算 “()e()e()a()()e填关于吃喝的单词关于cov(x,y)=E(XY)-E(X)E(Y)的问题Cov(X,Y)=E(XY)-E(X)E(Y),可不是E(XY) =E(X)E(Y）吗?这两个E(XY)不一样吗? 向量a=-e'+3e''+2e''',b=4e'-6e''+2e'''c=-3e'+12e''+11e''',问a能否表示a＝mb＋nc的形式...向量a=-e'+3e''+2e''',b=4e'-6e''+2e'''c=-3e'+12e''+11e''',问a能否表示a＝mb＋nc的形式?若能,写出表达式,若不能,说明理由. 关于问候的E-mail英语的! 关于ln e的计算ln√e e^ln5,lne^2 2lne e^5 ln2 e开头关于花的英文单词,三克油! 关于自然底数e的由来求不定积分关于e E e e e e`````` E 吴老师：关于函数Y =e^x+e^-x/e^x-e^-x的函数图象这个问题,你去年已回答过,下面一点不明白,Y =[e^x+e^(-x)]/[e^x-e^(-x)]e^x-e^(-x)≠0e^x-1/e^x≠0e^(2x)≠1,x≠0定义域为x∈R,x≠0f(-x)=[e^(-x)+e^x]/[e^(-x)-e^x]=-f(x)∴ e的x方求导是e的x方问什么求导等于e的-x次方