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SUMMARY:Implications of LHC data on 125 GeV Higgs-like boson for the Stand
 ard Model and its various extensions
DTSTART;VALUE=DATE-TIME:20140704T144000Z
DTEND;VALUE=DATE-TIME:20140704T145500Z
DTSTAMP;VALUE=DATE-TIME:20261014T203805Z
UID:indico-contribution-1504@indico.ific.uv.es
DESCRIPTION:Speakers: Pyungwon Ko (KIAS)\nRecent data on 125 GeV Higgs-lik
 e boson at the LHC starts to constrain the electroweak symmetry breaking s
 ector of the SM and its various extensions. If one imposes the local gauge
  symmetry of the Standard Model (SM) (SU(3)c×SU(2)L×U(1)Y) to the SM and
  any possible new physics scenarios\, the SM Higgs properties will be modi
 fied by intrinsically two different ways: by new physics either coupling d
 irectly to the SM Higgs boson h\, or affecting indirectly the SM Higgs pro
 perties through the mixing of h with a SM singlet scalar s. The models of 
 two Higgs doublet\, extra sequential and mirror fermions belong to the fir
 st category\, whereas the models with a hidden sector dark matter\, extra 
 vector-like fermions and new charged vector bosons\, which can enhance the
  diphoton rate of the SM Higgs-like resonance\, belong to the second categ
 ory. We perform a global fit to data in terms of the effective Lagrangian 
 description of two interaction eigenstates of scalar bosons\, a SM Higgs a
 nd a singlet scalar\, and their mixing. This framework is more suitable to
  study singlet-extended scenarios discussed above compared to other approa
 ches based on the Lagrangian of mass eigenstates. With fairly model-indepe
 ndent assumptions\, the effective Lagrangian contains at most four free pa
 rameters still encompassing the majority of models in the literature. Inte
 restingly\, the SM gives the best fit if all data from ATLAS and CMS are u
 sed\, whereas various singlet extensions can fit better to individual ATLA
 S or CMS data. Without further assumptions\, an upper bound on the total w
 idth (or\, non-standard branching ratio) is generically obtained. Furtherm
 ore\, global fit based on our parameterization can be used to probe intera
 ctions of the singlet scalar if the singlet resides below 2mW.\n\nhttps://
 indico.ific.uv.es/event/2025/contributions/1504/
LOCATION: Auditorium 1
URL:https://indico.ific.uv.es/event/2025/contributions/1504/
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