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Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Phys Rev Lett. 2001 Dec 10;87(24):241802. doi: 10.1103/PhysRevLett.87.241802. Epub 2001 Nov 21.
We report the first observation of diffractive J/psi(--> mu+mu-) production in pp collisions at root square[s] = 1.8 TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum p(mu)T>2 GeV/c within the pseudorapidity region /eta/ < 1.0, the ratio of diffractive to total J/psi production rates is found to be R(J/psi) = [1.45 +/- 0.25]%. The ratio R(J/psi)(x) is presented as a function of x-Bjorken. By combining it with our previously measured corresponding ratio R(jj)(x) for diffractive dijet production, we extract a value of 0.59 +/- 0.15 for the gluon fraction of the diffractive structure function of the proton.
我们报告了在质心能量平方根[s]=1.8 TeV的质子-质子碰撞中对衍射J/ψ（→μ⁺μ⁻）产生的首次观测。衍射事件通过其快度间隙特征来识别。在一个赝快度区域|η|<1.0内有两个横向动量p(μ)T>2 GeV/c的μ子的事件样本中，发现衍射J/ψ产生率与总J/ψ产生率之比为R(J/ψ)=[1.45±0.25]%。R(J/ψ)(x)作为x- Bjorken的函数给出。通过将其与我们之前测量的衍射双喷注产生的相应比率R(jj)(x)相结合，我们提取出质子衍射结构函数的胶子份额值为0.59±0.15。
