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SUMMARY:Double Higgs production in the Standard Model with extended scalar
  sector
DTSTART;VALUE=DATE-TIME:20151006T100000Z
DTEND;VALUE=DATE-TIME:20151006T101500Z
DTSTAMP;VALUE=DATE-TIME:20260819T052715Z
UID:indico-contribution-311@cern.ch
DESCRIPTION:Speakers: Evgeny Zhemchugov (ITEP\, MEPhI)\nWhen the Standard 
 Model is extended with extra scalar particles\, they mix to form physical 
 mass eigenstates. One of these eigenstates is associated with the recently
  discovered 125 GeV Higgs boson. If one of the other eigenstates is suffic
 iently massive\, it may decay to two 125 GeV states\, and thus provide sig
 nificant contribution to the $pp \\to hh$ cross section which in the Stand
 ard Model is as low as 40 fb for $\\sqrt{s} = 14$ TeV---too low to be meas
 ured before the high-luminosity LHC upgrade. In this talk three models wil
 l be considered\, the first extends the SM with an isosinglet\, the second
  with an isotriplet\, and the third with two isotriplets (the Georgi-Macha
 cek model). The first two models have two neutral scalar particles. Bounds
  on the $pp \\to hh$ cross section coming from electroweak precision obser
 vables (isosinglet) and custodial symmetry violation (one isotriplet) will
  be discussed. In the case of the isosinglet bounds allow for cross sectio
 n values as high as 0.5 pb\, while for the isotriplet only 20 extra fb is 
 feasible. In the Georgi-Machacek model $pp \\to hh$ cross section can reac
 h 2 pb depending on model parameters.\n\nhttps://indico.particle.mephi.ru/
 event/2/contributions/311/
LOCATION:Milan Hotel 4* Rossini
URL:https://indico.particle.mephi.ru/event/2/contributions/311/
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