Color unified dynamical axion

Color unified dynamical axion
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颜色统一动力轴

DOI:
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
R. D. Rey
R. D. Rey
中科院分区:
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文献类型:
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作者:
M. Gaillard;M. B. Gavela;R. Houtz;P. Quílez;R. D. Rey

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我们考虑一个扩大的色扇区,解决了强CP问题,通过新的无质量费米子。一个统一的艾德色群自发地分裂成QCD和另一个限定群,由于小尺寸的瞬子,提供了一个自然大的轴子质量m a的来源。这个额外的轴子质量源自动遵守真空的对齐,确保低能量CP守恒真空。该机制不需要SM的Z 2“镜像”副本,也不需要在统一尺度上对与轴子相关的耦合进行任何微调。这里没有非常轻的轴子,而且反常的是,较轻的光谱中包含的是不育的费米子。轴子尺度fa可以自然地降低到几TeV,具有比这个尺度小的有色伪标量的奇异光谱,通过强相互作用在对撞机上可以观察到。因此,允许解决强CP问题的{ M A,F A }参数空间被放大,远远超出了不可见的轴子模型。
We consider an enlarged color sector which solves the strong CP problem via new massless fermions. The spontaneous breaking of a unified color group into QCD and another confining group provides a source of naturally large axion mass m a due to small size instantons. This extra source of axion mass respects automatically the alignment of the vacuum, ensuring a low-energy CP-conserving vacuum. The mechanism does not appeal to a Z 2 “mirror” copy of the SM, nor does it require any fine-tuning of the axion-related couplings at the unification scale. There is no very light axion and uncharacteristically the lighter spectrum contains instead sterile fermions. The axion scale f a can be naturally brought down to a few TeV, with an exotic spectrum of colored pseu-doscalarslighterthanthisscale,observableatcollidersexclu- sively via strong interactions. The { m a , f a } parameter space which allows a solution of the strong CP problem is thus enlarged well beyond that of invisible axion models.
DOI: 10.1103/physrevd.85.114024
发表时间: 2012-03
期刊: Physical Review D
影响因子: 5
作者:
D. Gonçalves;D. López-Val;K. Mawatari;T. Plehn;I. Wigmore
通讯作者: D. Gonçalves;D. López-Val;K. Mawatari;T. Plehn;I. Wigmore