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SUMMARY:Seminar\, Mohammad Aghaie (Osaka U.)
DTSTART;VALUE=DATE-TIME:20261126T043000Z
DTEND;VALUE=DATE-TIME:20261126T053000Z
UID:297961628020
DESCRIPTION:Title:\nAnomaly-free axion-like particle in Nelson-Barr models
 \n\nAbstract:\nThe strong CP problem is one of the long-standing puzzles o
 f the Standard Model. The Nelson-Barr mechanism provides an attractive sol
 ution through spontaneous CP violation while keeping the QCD vacuum angle 
 effectively zero. In this talk\, I will discuss a remarkable low-energy co
 nsequence of this mechanism: the natural emergence of a light axion-like p
 article (ALP).\nI will first briefly introduce the strong CP problem and t
 he Nelson-Barr mechanism. I will then show how an ALP arises naturally in 
 these models without requiring additional ingredients. Unlike the QCD axio
 n\, this ALP is anomaly-free\, with highly suppressed couplings to photons
  and gluons. At the same time\, it has flavor-violating couplings to Stand
 ard Model quarks\, with a structure closely related to the CKM matrix. Rar
 e meson decays can therefore provide an interesting probe of the underlyin
 g Nelson-Barr mechanism.\nI will also discuss the cosmological properties 
 of this ALP\, considering both freeze-in and misalignment production\, and
  study the constraints from precision flavor measurements\, stellar coolin
 g\, and cosmological observations. In particular\, I will emphasize how ra
 re flavor-changing decays can probe the high-energy physics responsible fo
 r solving the strong CP problem. The combination of precision flavor exper
 iments\, astrophysical observations\, and future cosmological and X-ray su
 rveys may therefore provide a way to test the Nelson-Barr mechanism throug
 h its low-energy ALP signature.\n(arXiv:2608.20773)
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