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SUMMARY:Heavy neutrinos in $e^+e^- \\to W^+W^-$: future colliders constrai
 nts
DTSTART;VALUE=DATE-TIME:20261030T100000Z
DTEND;VALUE=DATE-TIME:20261030T101500Z
DTSTAMP;VALUE=DATE-TIME:20261102T144456Z
UID:indico-contribution-6163@cern.ch
DESCRIPTION:Speakers: Georgy Chachava (MIPT)\nWe study the sensitivity of 
 future lepton colliders to heavy neutral leptons implemented within the se
 esaw type-I model through precision measurements of $e^+e^- \\to W^+W^-$. 
 Heavy–light neutrino mixing modifies the angular distribution and total 
 cross section of $W$-pair production. We derive prospective 95% C. L. cons
 traints for CEPC\, FCC-ee\, ILC\, CLIC\, and muon colliders\, including th
 e dependence on the heavy neutrino mass. We find that central angular regi
 on measurements can significantly improve the sensitivity for masses above
  the collider energy. At the same time we show that low energy precise mea
 surement is competitive to high energy measurement.  \n\nBased on paper pu
 blished in Physical Review D 114 (2026)\, 055001\, DOI:\nhttps://doi.org/1
 0.1103/p5nw-316c\n\nhttps://indico.particle.mephi.ru/event/626/contributio
 ns/6163/
LOCATION: Conference Hall 3
URL:https://indico.particle.mephi.ru/event/626/contributions/6163/
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