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arXiv 1602.03604hep-ph
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双光子、新真空角和强CP

Diphotons, New Vacuum Angles, and Strong CP

Patrick Draper, David McKeen

摘要:

标准模型包含了一个众所周知的、自然的自旋为0的双光子共振:$π^0$。许多研究指出,750 GeV的新双光子共振可能是一个类似的π介子,与伪南布-戈德斯通玻色子的手征对称性自发打破新的强动力学在TeV的规模。这些“hypercolor”模型一般被期望通过拓扑角度$\tildeθ$违反奇偶性。我们讨论了物理学的$\tildeθ$和它的影响的现象学的新部门。我们还描述了一些非零的$\tildeθ$的理论意义。特别是,$\tildeθ$可以产生一个${\cal O}(1)$阈值校正的QCD真空角$θ$附近的TeV规模,急剧约束强CP问题的紫外线解决方案。或者,发现$\tildeθ$是小的,可以解释为证据,有利于紫外线解决方案,以强CP,特别是那些基于自发打破P或CP对称性。

英文摘要:

The Standard Model contains a well-understood, natural, spin-0 diphoton resonance: the $π^0$. Numerous studies have pointed out that the hint of a new diphoton resonance at 750 GeV could be a pion analog, identified with the pseudo-Nambu-Goldstone boson of a chiral symmetry spontaneously broken by new strong dynamics at the TeV scale. These "hypercolor" models are generically expected to violate parity through a topological angle $\tildeθ$. We discuss the physics of $\tildeθ$ and its impact on the phenomenology of the new sector. We also describe some of the theoretical implications of a nonzero $\tildeθ$. In particular, $\tildeθ$ can generate an ${\cal O}(1)$ threshold correction to the QCD vacuum angle $θ$ near the TeV scale, sharply constraining ultraviolet solutions to the strong CP problem. Alternatively, finding that $\tildeθ$ is small may be interpreted as evidence in favor of UV solutions to strong CP, particularly those based on spontaneously broken P or CP symmetries.

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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