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SUMMARY:Topological gauge dynamics of Standard Model $\\theta$ vacua
DTSTART:20260618T100000Z
DTEND:20260618T113000Z
DTSTAMP:20260609T081900Z
UID:indico-event-2558@indico.ifae.es
DESCRIPTION:Speakers: Pier Giuseppe Catinari\n\nIn this talk I will discus
 s the infrared signatures of topological terms in the Standard Model actio
 n\, focusing on their role in the strong CP problem and in non-perturbativ
 e B+L violation in the electroweak sector.\nI will first revisit the massi
 ve Schwinger model as a theoretical laboratory\, highlighting its structur
 al parallels with QCD in the large—$N_c$ limit and emphasizing the role 
 of the $\\eta'$ meson in the vanishing of the topological susceptibility o
 f QCD in the chiral limit. I will then critically examine recent claims in
  the literature (https://arxiv.org/abs/2408.07535) according to which the 
 vanishing of the electroweak topological susceptibility\, in the absence o
 f B+L violations\, proceeds in strict analogy with QCD in the chiral limit
 . Such arguments would require the presence of a new pseudoscalar state in
  the spectrum — an electroweak $\\eta'$ — mimicking the role of the $\
 \eta'$ meson in QCD.\n \n\nhttps://indico.ifae.es/event/2558/
LOCATION:IFAE Seminar Room (In-Person)
URL:https://indico.ifae.es/event/2558/
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