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THiNKiNG STRONG - CP3-Origins

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electroweak symmetry breaking and its experimental<br />

validation.<br />

O’ Higgs where art Thou?<br />

A careful analysis of the different decay modes, and<br />

scattering amplitudes allowing to determine the nature of the<br />

Higgs is in order. We will use the effective Lagrangian<br />

approach in which a singlet state is added to the non-linearly<br />

realized SM Lagrangian featuring only the already<br />

discovered fields. We will then consider different limits, e.g.<br />

the case of the SM Higgs. This analysis is extremely<br />

important especially in view of the recent tantalizing<br />

experimental results released by the ATLAS and CMS<br />

collaborations. In fact, combining different channels ATLAS<br />

reported 3.6 standard deviations excess for a reference Higgslike<br />

state with a mass around 126 GeV. This analysis will help<br />

elucidate the nature of this state.<br />

By the end of 2012, depending on LHC performance, we<br />

might know if a particle similar to the SM Higgs boson has<br />

been discovered or excluded. Whatever the experimental<br />

outcome will be novel dynamics can play a fundamental role.<br />

This is so since there are a number of theoretical drawbacks<br />

with accepting the existence of a SM Higgs. For example a<br />

SM Higgs with a mass around 126 GeV might render the<br />

vacuum of the electroweak sector unstable at high energies,<br />

implying that the SM is an inconsistent theory.<br />

Higgs: Elementary or Composite?<br />

We will investigate a near-conformal (composite) nature of<br />

the Higgs. Here the Higgs is naturally identified with the<br />

state saturating the dilatonic current of the fundamental<br />

14

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