Kirill Prokofiev (Faculty of Arts and Science, NYU, USA), "Measurement of the spin and parity of the new boson discovered by the ATLAS experiment at the LHC" (Candidature CR1)

jeudi 7 mars 2013, 14:00 → 15:00 Europe/Paris

LPNHE

In summer 2012 the CMS and ATLAS experiments at the LHC reached an important milestone. A new boson with a mass around 126 GeV was discovered in the combination of searches for the Higgs boson in H → γγ, H → ZZ(∗) → 4l and H → WW decays. The observed production and decay modes are compatible with those predicted for the Standard Model Higgs boson. However, in order to prove that the newly discovered particle is the Higgs boson responsible for the mechanism of the electroweak symmetry breaking and the mass generation of elementary particles, its quantum numbers should be determined and couplings to other particles and self-couplings measured. In the Standard Model the Higgs boson is a CP-even, spin zero particle. Beyond the Standard Model the electroweak symmetry breaking can lead to multiple Higgs states with even and odd CP quantum numbers. If CP is violated in the Higgs sector then the physical Higgs states with mixed CP could exist. In this presentation the options for spin and parity of the newly observed Higgs-like boson will be discussed. The present spin and parity measurements produced by ATLAS and CMS will be shown. A part of the discussion will be dedicated to near and far future prospects of the spin and parity measurements at LHC. A particular emphasis will be given to the possibility of future experimental observation of the CP-violation effects in the Higgs sector using ATLAS data

Slides SeminarSpin_LPNHE_M.pptx.pdf