Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF
Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF
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DOI：
10.1103/physrevlett.102.152001
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发表时间：
2009-04-17
影响因子：
8.6
通讯作者：
Zucchelli, S.
中科院分区：
文献类型：
--
作者：
Aaltonen, T.;Adelman, J.;Zucchelli, S.
本文报道了在双轻子衰变道tt -> bl（'+）nu（'）（l）b1 nu（l）中顶夸克质量M-t的测量结果。事件的选择与神经网络已直接优化的统计精度在顶夸克质量使用神经进化，一种技术模仿生物进化。顶夸克的质量是从每事件的概率密度，形成的领先的顺序矩阵元素和检测器分辨率函数的卷积提取。联合概率是CDF II探测器收集的2.0 fb（-1）pp碰撞中344个候选事件的概率密度的乘积，产生的测量值为M-t=171.2 +/- 2.7（stat）+/- 2.9（syst）GeV/c（2）。
We report a measurement of the top-quark mass M-t in the dilepton decay channel tt -> bl('+)nu(')(l)b1 nu(l). Events are selected with a neural network which has been directly optimized for statistical precision in top-quark mass using neuroevolution, a technique modeled on biological evolution. The top-quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0 fb(-1) of pp collisions collected with the CDF II detector, yielding a measurement of M-t=171.2 +/- 2.7(stat)+/- 2.9(syst) GeV/c(2).