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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. 2008 Aug 15;101(7):071802. doi: 10.1103/PhysRevLett.101.071802. Epub 2008 Aug 13.
We search for pair production of supersymmetric top quarks (t over1), followed by R-parity violating decay t over1-->taub with a branching ratio beta, using 322 pb(-1) of pp over collisions at sqrt s=1.96 TeV collected by the upgraded Collider Detector at Fermilab. Two candidate events pass our final selection criteria, consistent with the standard model expectation. We set upper limits on the cross section sigma(t over1t over1) x beta2 as a function of the top-squark mass m(t over1). Assuming beta=1, we set a 95% confidence level limit m(t over1)>153 GeV/c2. The limits are also applicable to the case of a third-generation scalar leptoquark (LQ3) decaying LQ3-->taub.
我们利用费米实验室升级后的对撞机探测器在(\sqrt{s}=1.96) TeV下收集的(322) pb(^{-1})的质子-质子碰撞数据，寻找超对称顶夸克（(\tilde{t})）的对产生过程，随后是违反(R)宇称的衰变(\tilde{t}\to\tau b)，分支比为(\beta)。有两个候选事件通过了我们的最终筛选标准，这与标准模型预期一致。我们设定了作为顶夸克质量(m(\tilde{t}))函数的截面(\sigma(\tilde{t}\tilde{t})\times\beta^2)的上限。假设(\beta = 1)，我们设定了(95%)置信水平的限制(m(\tilde{t})>153) GeV/(c^2)。这些限制也适用于第三代标量轻夸克（(LQ_3)）衰变(LQ_3\to\tau b)的情况。
