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SUMMARY:Radiative Corrections from Lattice QCD: Connecting Precision Measu
 rements to Tests of the Standard Model
DTSTART:20261117T203000Z
DTEND:20261117T213000Z
DTSTAMP:20261115T022100Z
UID:indico-event-34995@indico.bnl.gov
CONTACT:pboyle@bnl.gov
DESCRIPTION:Speakers: Xin-Yu Tuo (Brookhaven national laboratory)\n\n \nA
 s precision tests of the Standard Model\, such as CKM unitarity and lepton
  flavor universality\, enter the sub-percent era\, radiative corrections b
 ecome indispensable for identifying small deviations that could signal new
  physics. Predicting them is highly challenging\, as they intertwine long-
 distance QED with nonperturbative QCD and therefore require lattice QCD+QE
 D calculations with controlled finite-volume systematics.\n \nI will pres
 ent an approach that treats the photon in infinite volume\, strongly suppr
 essing the finite-volume effects that have limited previous calculations. 
 For first-row CKM unitarity\, where current data show a tension with the S
 tandard Model\, we turn the isospin-breaking correction to kaon and pion l
 eptonic decays from a leading into a subleading source of uncertainty. For
  lepton flavor universality\, which the PIONEER experiment aims to test to
  0.01% through the pion decay ratio $R_{e/\\mu}$\, we present the first la
 ttice calculation of the hadronic-structure correction\, giving a first-pr
 inciples prediction of matching precision. In radiative leptonic decays\, 
 we find that higher-order corrections\, enhanced by large collinear logari
 thms\, reach 10% and explain significant discrepancies between theory and 
 experiment\, with direct implications for the ongoing NA62 measurement. Fi
 nally\, I will discuss ongoing extensions of the method beyond leptonic de
 cays and the opportunities they open for future precision tests of the Sta
 ndard Model.\n \n\nhttps://indico.bnl.gov/event/34995/
LOCATION:Large Seminar Room
URL:https://indico.bnl.gov/event/34995/
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