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SUMMARY:CEPC experiment potential for observation of rare Higgs boson deca
 y H->ZZ*->4nu at sqrt(s)=240 GeV
DTSTART;VALUE=DATE-TIME:20261029T061500Z
DTEND;VALUE=DATE-TIME:20261029T063000Z
DTSTAMP;VALUE=DATE-TIME:20261102T005617Z
UID:indico-contribution-6188@cern.ch
DESCRIPTION:Speakers: Sergey Korpachev (LPI)\nThe CEPC working point at th
 e center of mass energy around 240 GeV corresponds to the largest cross se
 ction of the higgsstrahlung process and allows effective usage of the reco
 il mass technique for measurements of Higgs boson parameters. The interest
 ing task is the search for invisible decays of the Higgs boson: H->ZZ*->4n
 u. The dijet final states of the process e+e-->ZH\, where Z boson decays t
 o quarks\, have large branching fractions but quite large background contr
 ibutions. In this work\, a two-stage machine learning algorithm for separa
 tion of the invisible Higgs decay signal in dijet final states is presente
 d. At the first stage\, separate binary classifiers are trained on signal-
 background pairs for several dominating background channels. At the second
  stage\, a combined classifier is trained using the outputs of the first-s
 tage models as inputs. The study was done with full simulation and reconst
 ruction of the signal and background processes by the CEPC software. The p
 erformance of the two-stage approach is compared with conventional kinemat
 ic selections\, and its effect is discussed on the upper limit on the bran
 ching fraction of the Higgs boson invisible decay.\n\nhttps://indico.parti
 cle.mephi.ru/event/626/contributions/6188/
LOCATION: Conference Hall 3
URL:https://indico.particle.mephi.ru/event/626/contributions/6188/
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