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SUMMARY:Haotian Cao\,SBU& Northwestern U\,  [HET Seminar]  Single-spin mea
 surements and heavy new physics in the $e^+e^- \\to t\\bar{t}$ process at 
 an FCC-ee
DTSTART:20260129T160000Z
DTEND:20260129T180000Z
DTSTAMP:20260311T043900Z
UID:indico-event-30629@indico.bnl.gov
DESCRIPTION:We investigate the sensitivity of a future FCC-ee collider to 
 heavy new physics in$e^+e^- \\to t\\bar{t}$ within the Standard Model Effe
 ctive Field Theory (SMEFT) framework. Focusing on the full set of spin obs
 ervables encoded in the spin-density matrix\, we show that single-spin mea
 surements provide competitive and sometimes stronger probes of dimension-s
 ix Wilson coefficients than traditional unpolarized rates and spin-correla
 tion observables. In particular\, single-spin observables access complemen
 tary combinations of SMEFT parameters and play a crucial role in lifting f
 lat directions in the parameter space. A numerical study at $\\sqrt{s}=365
 $ GeV demonstrates that FCC-ee precision data can constrain new physics at
  scales well above the collider energy.\n \nhttps://bnl.zoomgov.com/j/160
 10362754?pwd=Z1l1SS9JUDlyR1hSUHNyaDV1dTZHUT09 \n\nhttps://indico.bnl.gov/
 event/30629/
LOCATION:Small Seminar Room
URL:https://indico.bnl.gov/event/30629/
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