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arXiv 1304.2273hep-phhep-ex
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顶部FBA上的有色玻色子和用于$t \bar t$生产的角截面

Colored bosons on top FBA and angular cross section for $t \bar t$ production

R. Benbrik, Chuan-Hung Chen, M. EL Kacimi

备注：
13 pages, 5 figures; references added
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摘要：

利用对应于9.4 fb $^{-1}$的积分光度的完整数据集，CDF更新了顶夸克前后不对称性（FBA）作为快度差$|Δy|$和$t\bar t$不变质量$M_{t\bar t}$的函数。除了在大$|Δy|$和$a_1= 0.39\pm 0.108 $下实验与标准模型（SM）预测的持续不一致外，还发现了一个意想不到的大的第一Legendre矩.为了求解大的top FBA，我们研究了色三重标量和色八重矢量玻色子的贡献.我们发现在三重态和八重态模型中，在$|Δy| >1$和$M_{t\bar t} > 450$ GeV处的顶FBA可以被增强到大约30%和20%，而第一Legendre矩分别是$a^{\bf Di}_1= 0.38$和$a^{\bf Axi}_1= 0.23$。

英文摘要：

With full data set that corresponds to an integrated luminosity of 9.4 fb$^{-1}$, CDF has updated the top quark forward-backward asymmetry (FBA) as functions of rapidity difference $|Δy|$ and $t\bar t$ invariant mass $M_{t\bar t}$. Beside the sustained inconsistency between experiments and standard model (SM) predictions at large $|Δy|$ and $M_{t\bar t}$, an unexpected large first Legendre moment with $a_1= 0.39\pm 0.108 $ is found. In order to solve the large top FBA, we study the contributions of color triplet scalar and color octet vector boson. We find that the top FBA at $|Δy| >1$ and $M_{t\bar t} > 450$ GeV in triplet and octet model could be enhanced to be around 30% and 20%, whereas the first Legendre moment is $a^{\bf Di}_1= 0.38$ and $a^{\bf Axi}_1= 0.23$, respectively.

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