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4th generation searches at ATLAS
Feligioni L.
ICHEP2012- 36th International Conference for High Energy Physics, Melbourne : Australie (2012) - http://hal.in2p3.fr/in2p3-00716815
Physique/Physique des Hautes Energies - Expérience
4th generation searches at ATLAS
L. Feligioni1
1 :  CPPM - Centre de Physique des Particules de Marseille
CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II
163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09
The top-quark is the heaviest known fundamental particle with unique properties within the Standard Model. Its large couplings to the Higgs boson, and being the only quark that decays before hadronisation make it sensitive to new physics beyond the SM. A potential extension for the SM would be the adjonction a 4th family of heavy chiral fermions that could provide new sources of CP violation to explain the matter-antimatter asymmetry in the Universe, and allow for a heavier Higgs boson while remaining consistent with other precision electroweak studies. We report on searches for 4th generation quarks using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.

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ICHEP2012- 36th International Conference for High Energy Physics
L. Feligioni