BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Small Instanton Effects on Composite Axion Mass
DTSTART:20260702T130000Z
DTEND:20260702T140000Z
DTSTAMP:20260630T215600Z
UID:indico-event-1567@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takafumi Aoki\n\nThe Peccei–Quinn (PQ) mechanism i
 s a prominent solution to the strong CP problem. However\, it faces the ax
 ion quality problem: higher-dimensional\, Planck-suppressed operators whic
 h explicitly break PQ symmetry can reintroduce the effective QCD theta ang
 le. In composite axion models\, where strong dynamics at high energies bre
 ak PQ symmetry at a dynamically generated scale\, the Peccei–Quinn scale
  arises naturally through dimensional transmutation\, and certain construc
 tions also address this quality problem. This setup\, however\, raises a f
 urther question: hidden interactions distinct from QCD may also generate i
 nstanton effects\, which could appear to give additional contributions to 
 the axion mass. We demonstrate that while these small instantons enhance t
 he axion mass in a toy model\, they do not contribute to the axion mass in
  a more complete explicit composite axion model.\n\nhttps://conference.ipp
 p.dur.ac.uk/event/1567/
URL:https://conference.ippp.dur.ac.uk/event/1567/
END:VEVENT
END:VCALENDAR