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SUMMARY:Search for Higgs boson pair production in the two bottom quarks pl
 us two photons final state in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with
  the ATLAS detector
DTSTART;VALUE=DATE-TIME:20220323T130000Z
DTEND;VALUE=DATE-TIME:20220323T131500Z
DTSTAMP;VALUE=DATE-TIME:20260521T113745Z
UID:indico-contribution-2214@indico.tlabs.ac.za
DESCRIPTION:Speakers: Mohamed Belfkir (UAEU)\nFrom the discovery of the Hi
 ggs boson in 2012\, most of its properties such as mass\, spin\, productio
 n cross-section and its coupling to fermions and bosons have been measured
 . However\, the trilinear self-coupling $\\lambda_{HHH}$ of the Higgs boso
 n has not been measured yet. This parameter controls the shape of the Higg
 s potential\, explaining the importance of its measurement. Deviation from
  its Standard Model (SM) predicted value would indicate new physics beyond
  the SM (BSM). Deviations are quantified through the $\\kappa_{\\lambda}$ 
 modifier. At the LHC\, it is measured through the rate of the rare Higgs b
 oson pair production (HH) process\, which is the only direct way to access
  it. This process is mainly produced at the LHC via gluon-gluon fusion (gg
 F) through destructive interference of two Feynman diagrams involving quar
 k loops and the triple Higgs boson self-interaction. At the LHC centre-of-
 mass energy of 13 TeV\, the cross-section of the Higgs boson pair producti
 on is $31.05_{-5.0\\%}^{+2.2\\%}$ fb as predicted by the SM. This low cros
 s-section could be enhanced by the presence of BSM physics (non-resonant a
 nd resonant)\, thus the motivation to explore the search for the double Hi
 ggs production. \nThis presentation will focus on the search for the Higgs
  boson pair production in the two bottom quarks plus two photons final sta
 tes with the 2015-2018 data recorded by the ATLAS detector recently publis
 hed (https://arxiv.org/pdf/2112.11876.pdf). This search sets observed (exp
 ected) upper limits to the HH cross-section of 4.2 (5.7) times the SM expe
 ctation. The observed (expected) constrains on the Higgs boson trilinear m
 odifier $\\kappa_{\\lambda}$ are determined to be [-1.5\, 6.7] ([-2.4\, 7.
 7]) at 95% confidence level. The search explores the resonant production o
 f double Higgs ($pp\\to X \\to HH$) and sets limits on its cross-section a
 s a function of the $m_{X}$.  The observed (expected) limits on the cross-
 section of $pp\\to X \\to HH$ range from 610 fb to 47 fb (360 fb to 43 fb)
  over the constrained mass range.\nIn this presentation\, both the search 
 for the resonant and non-resonant double Higgs production will be detailed
 \, in addition to a comparison with other searches f the Higgs pair produc
 tion with other final states and using data collected between 2015-2016.\n
 \nhttps://indico.tlabs.ac.za/event/109/contributions/2214/
LOCATION:
URL:https://indico.tlabs.ac.za/event/109/contributions/2214/
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