Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia.
Phys Rev Lett. 2009 Oct 2;103(14):142301. doi: 10.1103/PhysRevLett.103.142301. Epub 2009 Sep 30.
Bose-Einstein correlations of charged kaons are used to probe Au+Au collisions at sqrt[S(NN)]=200 GeV and are compared to charged pion probes, which have a larger hadronic scattering cross section. Three-dimensional Gaussian source radii are extracted, along with a one-dimensional kaon emission source function. The centrality dependences of the three Gaussian radii are well described by a single linear function of N(part)1/3 with a zero intercept. Imaging analysis shows a deviation from a Gaussian tail at r greater than or approximately equal to 10 fm, although the bulk emission at lower radius is well described by a Gaussian. The presence of a non-Gaussian tail in the kaon source reaffirms that the particle emission region in a heavy-ion collision is extended, and that similar measurements with pions are not solely due to the decay of long-lived resonances.
利用带电 K 介子的玻色-爱因斯坦关联来探测在 sqrt[S(NN)]=200 GeV 下的 Au+Au 碰撞，并将其与带电π介子探针进行比较，后者具有更大的强子散射横截面积。提取了三维高斯源半径，以及一维 K 介子发射源函数。三个高斯半径的中心度依赖性可以很好地用 N(part)1/3 的单个线性函数来描述，其中截距为零。成像分析表明，在 r 大于或约等于 10 fm 时，高斯尾部会出现偏离，尽管在较低半径处的整体发射很好地符合高斯分布。K 介子源中存在非高斯尾部这一事实再次证实，在重离子碰撞中，粒子发射区域是扩展的，而类似的使用π介子进行的测量并不仅仅是由于长寿命共振的衰变。
