arXiv 0809.49032008-09-29hep-ex

在$p\bar{p}$ TeV上寻找同电荷轻子对碰撞中的最大味破坏标量

Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in $p\bar{p}$ Collisions at $\sqrt{s} = 1.96$ TeV

The CDF Collaboration

备注：: 4 pages, 3 figures
发表信息：: Phys.Rev.Lett.102:041801,2009
DOI：: 10.1103/PhysRevLett.102.041801

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摘要：

基本粒子物理学中的最大味违反（MxFV）模型可以包含至少一个新的标量SU $(2)$双峰场$Φ_{FV} = (η^0,η^+)$，其经由拉格朗日项$\mathcal{L}_{FV} = ξ_{13} Φ_{FV} q_1 q_3$耦合第一代和第三代夸克（$q_1,q_3$）。这些模型具有同电荷顶夸克对的独特特征，并避开了介子混合测量的味道变化限制。在$\sqrt{s} = 1.96$ TeV的$p\bar{p}$碰撞中，由CDF II探测器收集的对应于2 fb $^{-1}$的数据被分析，以获得MxFV签名的证据。对于具有$m_{η^0} = 200$ GeV/ $c^2$和耦合$ξ_{13}=1$的中性标量$η^0$，在$2.1 \pm 1.8$事件的背景上预期$\sim$ 11信号事件。在数据中观察到三个事件，与背景预期一致，并对$m_{η^0} = 180-300$ GeV/ $c^2$的耦合$ξ_{13}$设定了限值。

英文摘要：

Models of Maximal Flavor Violation (MxFV) in elementary particle physics may contain at least one new scalar SU$(2)$ doublet field $Φ_{FV} = (η^0,η^+)$ that couples the first and third generation quarks ($q_1,q_3$) via a Lagrangian term $\mathcal{L}_{FV} = ξ_{13} Φ_{FV} q_1 q_3$. These models have a distinctive signature of same-charge top-quark pairs and evade flavor-changing limits from meson mixing measurements. Data corresponding to 2 fb$^{-1}$ collected by the CDF II detector in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV are analyzed for evidence of the MxFV signature. For a neutral scalar $η^0$ with $m_{η^0} = 200$ GeV/$c^2$ and coupling $ξ_{13}=1$, $\sim$ 11 signal events are expected over a background of $2.1 \pm 1.8$ events. Three events are observed in the data, consistent with background expectations, and limits are set on the coupling $ξ_{13}$ for $m_{η^0} = 180-300$ GeV/$c^2$.

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