Challenges for the Nelson-Barr mechanism

Michael Dine, Patrick Draper

Research output: Contribution to journalArticlepeer-review


Abstract: The axion and mu = 0 solutions to the strong CP problem have been subject to the most careful scrutiny and critique. Basic theoretical issues include hierarchy and fine-tuning problems, quality and genericity of symmetries, and compatibility with solutions to the electroweak hierarchy problem. We study the similar set of challenges for solutions to strong CP based on spontaneous CP violation and the Nelson-Barr mechanism. Some of our observations have appeared in the literature previously, and others are new; our purpose is to collect and analyze the issues as a whole and provide an assessment of the most plausible settings for the Nelson-Barr solution.

Original languageEnglish (US)
Article number132
JournalJournal of High Energy Physics
Issue number8
StatePublished - Aug 7 2015
Externally publishedYes


  • Beyond Standard Model
  • CP violation
  • Quark Masses and SM Parameters

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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