Color unified dynamical axion
Color unified dynamical axion
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DOI:
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发表时间:
2018
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影响因子:
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通讯作者:
R. D. Rey
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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
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.
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