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arXiv 1107.2597hep-ph
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在大型强子对撞机上用顶极化探测单顶产生中的反常tbW耦合

Probing anomalous tbW couplings in single-top production using top polarization at the Large Hadron Collider

Saurabh D. Rindani, Pankaj Sharma

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25 pages, 34 figures
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摘要：

我们研究了大型强子对撞机（LHC）对与W^-玻色子相关联的单顶产生过程中tbW反常耦合的敏感性，随后是顶的半轻子衰变。我们计算顶部极化和这些异常耦合的影响，它在两个中心的质量（cm）的能量为7 TeV和14 TeV。作为顶部偏振的测量，我们观察其衰变产物的各种实验室帧分布，即，轻子角分布、能量分布和b夸克角分布，而不需要重建top的静止坐标系，并研究反常耦合对这些分布的影响。我们构建了一定的不对称性，研究这些分布的异常TBW耦合的敏感性。我们发现，在cm能量为14 TeV、积分亮度为10 fb^{-1}的LHC上利用这些不对称性可以得到的主导反常耦合Ref_{2R}的实部和虚部的1σ极限，将明显优于LHC上直接测量截面和其他一些变量的预期，并且比间接极限好一个数量级以上。

英文摘要：

We study the sensitivity of the Large Hadron Collider (LHC) to anomalous tbW couplings in single-top production in association with a W^- boson followed by semileptonic decay of the top. We calculate top polarization and the effects of these anomalous couplings to it at two centre-of-mass (cm) energies of 7 TeV and 14 TeV. As a measure of top polarization, we look at various laboratory frame distributions of its decay products, viz., lepton angular and energy distributions and b-quark angular distributions, without requiring reconstruction of the rest frame of the top, and study the effect of anomalous couplings on these distributions. We construct certain asymmetries to study the sensitivity of these distributions to anomalous tbW couplings. We find that 1σlimits on real and imaginary parts of the dominant anomalous coupling Ref_{2R} which may be obtained by utilizing these asymmetries at the LHC with cm energy of 14 TeV and an integrated luminosity of 10 fb^{-1} will be significantly better than the expectations from direct measurements of cross sections and some other variables at the LHC and over an order of magnitude better than the indirect limits.

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