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论文题目:	Theta in new QCD-like sectors
论文题目英文:
作者:	Draper, Patrick; Kozaczuk, Jonathan; Yu, Jiang-Hao
论文出处:
刊物名称:	PHYSICAL REVIEW D
年:	2018
卷:	98
期:	1
页:	15028
联系作者:	Draper, P (reprint author)
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摘要:	New QCD-like "hypercolor" sectors can generate a broad class of new signatures at hadron colliders and furnish a variety of dark matter candidates. Paired diboson resonances are a particularly important collider signature, arising both from CP-conserving vector hypermeson decays of the form (rho) over tilde -> (pi) over tilde(pi) over tilde -> 4V and from CP-violating pseudoscalar hypermeson decays of the form (eta) over tilde -> (pi) over tilde(pi) over tilde -> 4V. The latter are sensitive to the vacuum angle (theta) over tilde in the hypercolor sector. We study single- and paired-diboson resonance signatures in final states involving gluons and photons at the LHC and a future 100 TeV pp collider, illustrating the discovery potential at both colliders in simple benchmark models. We also describe some of the theoretical and cosmological consequences of (theta) over tilde. If CP-violating hypermeson decays are observable at hadron colliders, ordinary QCD must have an axion. Such scenarios also provide a natural setting for a dark pion component of dark matter, with its relic abundance set by CP-violating annihilations. If the new vacuum angle is relaxed to zero by a dark axion, the relic density can instead be a mixture of axions and dark axions. Overproduction of dark axions is most easily avoided if the Universe underwent a period of early matter domination.
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