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SUMMARY:Nicola Valori: "Pion β decay and τ→π π ν_τ beyond leading 
 logarithms"
DTSTART:20260326T123000Z
DTEND:20260326T133000Z
DTSTAMP:20260502T040100Z
UID:indico-event-51547@agenda.infn.it
DESCRIPTION:Semi-leptonic processes involving pions are used to test the S
 tandard Model at high precision. On the theory side\, the evaluation of ra
 diative corrections is a crucial ingredient for a robust comparison betwee
 n theoretical predictions and experimental measurements. In this talk\, I 
 will present the first complete effective field theory treatment of radiat
 ive corrections in pion $\\beta$ decay ($\\pi^{\\pm} \\rightarrow \\pi^0 \
 \\, e \\\, \\nu_{e}$) and $\\tau^{\\pm} \\rightarrow  \\pi^{\\pm} \\\, \\
 pi^{0} \\\, \\nu_{\\tau}$ beyond leading-logarithmic accuracy. As main app
 lications\, I will first show how the theoretical uncertainty for the SM p
 rediction of $V_{ud}$ based on pion  $\\beta$ decay is reduced by a facto
 r of three\, making it negligible even beyond the reach of the PIONEER exp
 eriment. Second\, I will present an evaluation of isospin-breaking correct
 ions to $\\tau \\rightarrow \\pi \\pi \\nu_{\\tau}$ with negligible uncert
 ainty from the short-distance matching\, as necessary for a future $\\tau$
 -based determination of the hadronic-vacuum-polarization contribution to t
 he anomalous magnetic moment of the muon.\n\nhttps://agenda.infn.it/event/
 51547/
LOCATION:Sala Direzione
URL:https://agenda.infn.it/event/51547/
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