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SUMMARY:Chiral anomaly\, neutral pion lifetime and axion-photon coupling
DTSTART;VALUE=DATE-TIME:20261010T094500Z
DTEND;VALUE=DATE-TIME:20261010T100000Z
DTSTAMP;VALUE=DATE-TIME:20261005T011852Z
UID:indico-contribution-2829@indico.itp.ac.cn
DESCRIPTION:Speakers: Tian Lin (Peking University)\nThe chiral anomaly und
 erlies many processes\, including the two-photon decay of the neutral pion
  and the axion-photon coupling\, and fixes their leading-order contributio
 ns to a constant independent of QCD dynamics. However\, traditional lattic
 e QCD methods compute the complete amplitude\, making percent-level precis
 ion demanding. We show that\, by applying the anomalous Ward identity (AWI
 )\, the anomalous contribution can be isolated directly\, leaving only a f
 inite-quark-mass correction that lattice QCD evaluates reliably.Employing 
 this strategy\, we present the first lattice determination of the neutral 
 pion lifetime with isospin-breaking effects\, and determine the axion-phot
 on coupling to $1.8\\%$ precision\, furnishing a first-principles benchmar
 k and reconciling the discrepancies among published ChPT determinations.\n
 \nhttps://indico.itp.ac.cn/event/437/contributions/2829/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2829/
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