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arXiv 1603.03049hep-ph
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在顶希格斯区有CP破坏的空间吗?

Is there room for CP violation in the top-Higgs sector?

V. Cirigliano, W. Dekens, J. de Vries, E. Mereghetti

摘要:

在标准模型有效场论的框架下,考虑CP守恒和CP破坏观测量,讨论了顶夸克与希格斯玻色子和规范玻色子的手征翻转耦合的直接和间接探测.在我们的分析中,我们包括当前和未来的约束,从对撞机物理,精密电弱测试,风味物理和电偶极矩(EDM)。我们发现,低能量的间接探针是非常有竞争力的,即使在长距离的不确定性。特别是,EDM把限制的电弱CP违反偶极矩的顶部是两到三个数量级强于现有的限制。顶部EDM上的新间接约束由$90\%$ C.L.处的$|d_t| < 5 \cdot 10^{-20}$ e cm给出。

英文摘要:

We discuss direct and indirect probes of chirality-flipping couplings of the top quark to Higgs and gauge bosons, considering both CP-conserving and CP-violating observables, in the framework of the Standard Model effective field theory. In our analysis we include current and prospective constraints from collider physics, precision electroweak tests, flavor physics, and electric dipole moments (EDMs). We find that low-energy indirect probes are very competitive, even after accounting for long-distance uncertainties. In particular, EDMs put constraints on the electroweak CP-violating dipole moments of the top that are two to three orders of magnitude stronger than existing limits. The new indirect constraint on the top EDM is given by $|d_t| < 5 \cdot 10^{-20}$ e cm at $90\%$ C.L.

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