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SUMMARY:Probing multi-particle unitarity with the Landau equations
DTSTART;VALUE=DATE-TIME:20220131T123000Z
DTEND;VALUE=DATE-TIME:20220131T140000Z
DTSTAMP;VALUE=DATE-TIME:20220523T151102Z
UID:indico-event-1117143@indico.cern.ch
DESCRIPTION:Implementation of multi-particle unitarity is among the bigges
t challenges in the nonperturbative S-matrix bootstrap. Unitarity implies
the existence of branch cuts along normal thresholds. Once combined with a
nalyticity\, unitarity also predicts the existence of other non-trivial si
ngularities known as Landau curves. In the elastic domain\, all the Landau
curves are known thanks to Mandelstam. In this talk\, I will show how the
leading multi-particle Landau curves can be obtained using graph-theoreti
c techniques. To our surprise\, we find an infinite sequence of Landau cur
ves that accumulate at finite energies. Our results should apply to any qu
antum field theory with at least one massive particle.\n\nhttps://indico.c
ern.ch/event/1117143/
LOCATION:CERN zoom only
URL:https://indico.cern.ch/event/1117143/
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