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arXiv 1012.3566hep-phhep-ex
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极化光束作用下ILC上e+e- \to W+W^-中附加Z玻色子的信号

Signals of additional Z boson in e+e-\to W+W^- at the ILC with polarized beams

B. Ananthanarayan, Monalisa Patra, P. Poulose

摘要:

我们考虑了在标准模型的扩展中,如E_6模型和左右对称模型中,通过与标准模型Z玻色子的混合,对自然产生的重附加Z'玻色子进行指纹识别的可能性。通过考虑一类可观测量,包括总截面,能量分布和角分布的衰变轻子,我们发现显着偏离标准模型预测这些量与右手电子和左手正电子在\sqrt{s} =800 GeV。在较小的质心能量下,偏差不太明显,因为模型已经受到严格约束。我们的工作表明,ILC应该有一个强大的光束偏振物理程序,特别是与这些配置。另一方面,由于与中微子t-通道图的有趣相互作用,向前向后不对称性和向后方向的轻子分数对具有现实极化的新物理更敏感。这一过程补充了费米子对生产过程的研究,已被认为是这些模型之间的歧视。

英文摘要:

We consider the possibility of fingerprinting the presence of heavy additional Z' bosons that arise naturally in extensions of the standard model such as E_6 models and left-right symmetric models, through their mixing with the standard model Z boson. By considering a class of observables including total cross sections, energy distributions and angular distributions of decay leptons we find significant deviation from the standard model predictions for these quantities with right-handed electrons and left-handed positrons at \sqrt{s}=800 GeV. The deviations being less pronounced at smaller centre of mass energies as the models are already tightly constrained. Our work suggests that the ILC should have a strong beam polarization physics program particularly with these configurations. On the other hand, a forward backward asymmetry and lepton fraction in the backward direction are more sensitive to new physics with realistic polarization due to interesting interplay with the neutrino t- channel diagram. This process complements the study of fermion pair production processes that have been considered for discrimination between these models.

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