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arXiv 1107.3574hep-exhep-ph
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在sqrt(s)= 1.96 TeV的ppbar碰撞中寻找具有大喷注多重数和丢失横向能量的末态新$T^\prime$粒子

Search for New $T^\prime$ Particles in Final States with Large Jet Multiplicities and Missing Transverse Energy in ppbar Collisions at sqrt(s) = 1.96 TeV

CDF Collaboration, T. Aaltonen

摘要:

我们提出了一个寻找新的粒子T'衰变到顶夸克通过T' -> t + X,其中X去检测。我们使用的数据样本对应于5.7 fb-1的积分亮度的ppbar碰撞与sqrt{s} = 1.96 TeV,收集在费米实验室的CDF II检测器。我们对T'的对产生的研究集中在强子衰变通道ppbar -> T' T ' -> tt +XX -> bbqqqq + XX。我们解释我们的结果在一个模型中,T'是一个奇异的第四代夸克和X是一个暗物质的候选者。数据与标准模型预期一致。我们对T 'T'->tt+XX的一般产生设定了一个限制,在95%的置信水平上排除了第四代奇异夸克T',直到m_T' = 400 GeV/c ~ 2(m_X < 70 GeV/c ~ 2)。

英文摘要:

We present a search for a new particle T' decaying to a top quark via T' -> t + X, where X goes undetected. We use a data sample corresponding to 5.7 fb-1 of integrated luminosity of ppbar collisions with sqrt{s} = 1.96 TeV, collected at Fermilab by the CDF II detector. Our search for pair production of T' is focused on the hadronic decay channel, ppbar -> T'T' -> tt +XX -> bbqqqq + XX. We interpret our results in terms of a model where T' is an exotic fourth generation quark and X is a dark matter candidate. The data are consistent with standard model expectations. We set a limit on the generic production of T'T'->tt+XX, excluding the fourth generation exotic quarks T' at 95% confidence level up to m_T' = 400 GeV/c2 for m_X < 70 GeV/c2.

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