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Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2007 Apr 6;98(14):142001. doi: 10.1103/PhysRevLett.98.142001. Epub 2007 Apr 3.
We present a measurement of the top-quark mass Mtop in the all-hadronic decay channel tt-->W+bW-b-->q1q2bq3q4b. The analysis is performed using 310 pb-1 of sqrt[s]=1.96 TeV pp[over ] collisions collected with the CDF II detector using a multijet trigger. The mass measurement is based on an event-by-event likelihood which depends on both the sample purity and the value of the top-quark mass, using 90 possible jet-to-parton assignments in the six-jet final state. The joint likelihood of 290 selected events yields a value of Mtop=177.1+/-4.9(stat)+/-4.7(syst) GeV/c2.
我们给出了在全强子衰变道tt→W⁺bW⁻b→q₁q₂bq₃q₄b中顶夸克质量Mtop的测量结果。该分析使用通过多喷注触发，利用CDF II探测器收集的310 pb⁻¹的√s = 1.96 TeV质子-质子碰撞数据进行。质量测量基于逐个事件的似然性，其依赖于样本纯度和顶夸克质量值，在六喷注末态使用90种可能的喷注到部分子的分配。对290个选定事件的联合似然性给出Mtop = 177.1±4.9（统计）±4.7（系统）GeV/c²的值。
