额外维中的挠率与单圈观测量
Torsion in Extra Dimensions and One-Loop Observables
摘要：
我们研究了额外维中的挠率引力，并在TeV量级的量子引力的基本尺度上导出了一个包含四个费米子接触算符的有效四维理论.这些算子可能会对低能量观测量产生影响，并且可以表现出来，或者可以在精确测量中受到约束。我们计算可能的贡献，这些运营商的一些观测在一个循环的水平。我们表明，现有的精确数据的轻子衰变模式的Z玻色子设置限制的基本规模的重力和紧化半径，这是更严格的限制比以前在文献中推导。
英文摘要：
We study gravity with torsion in extra dimensions and derive an effective four-dimensional theory containing four-fermion contact operators at the fundamental scale of quantum gravity in the TeV range. These operators may have an impact on the low-energy observables and can manifest themselves or can be constrained in precision measurements. We calculate possible contributions of these operators to some observables at the one-loop level. We show that the existing precision data on the lepton decay mode of Z boson set limits on the fundamental scale of the gravity and compactification radius, which are more stringent than the limits previously derived in the literature.
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