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arXiv 0905.2530hep-ex
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顶夸克性质的测量

Measurements of Top Quark Properties

L. Cerrito

摘要:

本文给出了测量顶夸克四种选定性质的初步结果。在$t\bar{t}$双轻子衰变通道中,通过胶子融合产生的$t\bar{t}$的相对分数已经由CDF协作组测量为$F_{gg}=0.53^{+0.36}_{-0.38}$。使用积分亮度光度2.7 FB $^{-1}$收集的CDF II探测器,我们还确定了$t\bar{t}$微分截面相对于值高达$\sim$ 1 TeV的$t\bar{t}$不变质量。我们提出了一个独立于模型的测量顶夸克衰变中产生的$W$玻色子的螺旋度,使用D0探测器收集的高达2.7 fb的$^{-1}$的积分亮度,并找到纵向$W$玻色子的分数$f_0=0.49\pm0.14$,右手$W$玻色子的分数$f_+=0.11\pm0.08$。最后,我们用CDF II探测器收集的3.2 fb $^{-1}$积分亮度测量了对产生顶夸克的部分子水平前后不对称性,发现了$A_{FB}=0.19\pm0.07$ .所有的结果都与标准模型的预测相一致。

英文摘要:

Preliminary results on the measurement of four selected properties of the top quark are presented. The relative fraction of $t\bar{t}$ production through gluon fusion has been measured in the $t\bar{t}$ dilepton decay channel by the CDF Collaboration as $F_{gg}=0.53^{+0.36}_{-0.38}$. Using an integrated luminosity of 2.7 fb$^{-1}$ collected with the CDF II detector, we also determine the $t\bar{t}$ differential cross section with respect to values up to $\sim$1 TeV of the $t\bar{t}$ invariant mass. We present a model-independent measurement of the helicity of $W$ bosons produced in top quark decays, using an integrated luminosity of up to 2.7 fb$^{-1}$ collected by the D0 detector, and find the fraction of longitudinal $W$ bosons $f_0=0.49\pm0.14$, and the fraction of right-handed $W$ bosons $f_+=0.11\pm0.08$. Finally, we measure the parton level forward-backward asymmetry of pair produced top quarks using an integrated luminosity of 3.2 fb$^{-1}$ collected with the CDF II detector, and find $A_{FB}=0.19\pm0.07$. All results are consistent with the predictions of the standard model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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