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Comptes Rendus Physique
Volume 16, n° 4
pages 394-406 (mai 2015)
Doi : 10.1016/j.crhy.2015.03.016
Implications of the Higgs boson discovery
Les implications de la découverte du boson de Higgs

José R. Espinosa a , Christophe Grojean a, b,
a ICREA at IFAE, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain 
b DESY, Notkestraße 85, 22607 Hamburg, Germany 

Corresponding author at: DESY, Notkestraße 85, 22607 Hamburg, Germany.

With the discovery of the Higgs boson by the LHC in 2012, a new era started in which we have direct experimental information on the physics behind the breaking of the electroweak (EW) symmetry. This breaking plays a fundamental role in our understanding of particle physics and sits at the high-energy frontier beyond which we expect new physics that supersedes the Standard Model (SM). In this review we summarize what we have learned so far from LHC data in this respect. In the absence of new particles having been discovered, we discuss how the scrutiny of the properties of the Higgs boson (in search for deviations from SM expectations) is crucial as it can point the way for physics beyond the SM. We also emphasize how the value of the Higgs mass could have far-reaching implications for the stability of the EW vacuum if there is no new physics up to extremely large energies.

The full text of this article is available in PDF format.

La découverte du boson de Higgs par les expériences du GCH en 2012 a ouvert une nouvelle ère, avec un accès expérimental direct à la dynamique responsable de la brisure de la symétrie électrofaible. Cette brisure de symétrie joue un rôle fondamental dans notre compréhension de la physique des particules et se situe à la limite des nos connaissances dans un domaine d'énergie au-delà duquel le modèle standard de la physique des particules devrait montrer ses limites. Dans cet article, nous résumons ce que les données du LHC nous ont d'ores et déjà appris. En l'absence de découverte de nouvelles particules, nous expliquons en quoi une étude méticuleuse des propriétés du boson de Higgs, et en particulier la recherche de déviations par rapport aux prédictions standards, est primordiale, puisqu'elle peut en effet indiquer comment dépasser ce modèle standard. Nous discutons aussi les implications de la valeur de la masse du boson de Higgs sur la stabilité du vide électrofaible dans l'hypothèse où le modèle standard reste valide jusqu'à des énergies extrêmement élevées.

The full text of this article is available in PDF format.

Keywords : Electroweak symmetry breaking, Higgs, Beyond the standard model, Compositeness, Vacuum stability

Mots-clés : Brisure de symétrie électrofaible, Higgs, Physique au-delà du modèle standard, Higgs composite, Stabilité du vide

1  The tunneling rate has been calculated beyond tree level, including the effect of fluctuations around the bounce solution in Ref. [[49]]. Gravitational effects, which have a negligible impact on the rate, were included in Ref. [[50]].

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