LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 1 Radion-Higgs Search at LHC/LC Work in progress.

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Presentation transcript:

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 1 Radion-Higgs Search at LHC/LC Work in progress

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 2 Trouble in Higgs ? Radions! Quantum excitations of brane distance in RS theories (e.g. Rizzo, Hewett, Dominici,Gunion Giudice, Wells, Rattazzi…etc) Can change things a lot for the LHC Horror! gg  H cross section disappears!!

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 3 Radions

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 4 Radions

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 5

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 6 Exercise…  Check where the Higgs discovery at LHC gets more difficult/impossible  Can one observe gg    ZZ* in those regions  perspectives for identifying the nature of the observed scalar at a LHC & LC Tool used HDECAY, introducing relevant terms for radions (J. Gunion/D. Dominici) Radion   ZZ*  4l 50 GeV < M  < 400 GeV Take experimental bounds (Tevatron/LEP) into account Higgs H  ZZ*  4l H  ttH  ttbb low Higgs mass range GeV

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 7 Higgs/Radion detectability LHC will essentially always see a scalar with 30 fb -1 Other decays need to be looked into (H  )

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 8 Higgs/Radion Detectability M H =115 GeV M H =130 GeVM H =140 GeV Becomes better for heavier Higgs Decay to study   HH for high mass LC should always see the light Higgs &  in almost entire region

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 9 Couplings at a LC

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 10 Ratio of couplings Effects are ~1-5%: Difficult to establish at LHC However: absolute cross section & gg  H/WW  HH possible handles

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 11 LC measurements Measure precisely Higgs to bb and WW (*) couplings Contours of 2.5  evidence for radion mixing effects

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 12 ZZ branching ratio

LC/LHC 14/2 CERN RADIONS Albert De Roeck (CERN) 13 Plans Explore further decay modes LHC with fb -1 Total cross sections Explore LC/LHC complementarity fully –Determination of Radion parameters