Particle and Astroparticle Seminar

Top Quark & Co.

Tamara Vázquez Schröder

McGill

The top quark was discovered in 1995 by the CDF and D0 Collaborations. It couples to the Standard Model fields through its gauge and Yukawa interactions. At hadron colliders, the first evidence of the coupling of the top quark to the Z and Higgs boson will come from the production rate. Given its large mass, the top quark may play a special role in the electroweak symmetry breaking (EWSB) and therefore, new physics related to EWSB may be found first in top quark precision measurements. The ttZ, ttW, and ttH production are becoming accessible with the high statistics top quark sample at the LHC, also called for this reason a ‘top quark factory’. In this talk, the latest measurements of the associated production of top quark pairs and Z/W/H bosons with the ATLAS experiment atthe LHC will be discussed, together with the outlook of these measurements for the second run of the LHC.