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We examine the constraints coming from incorporating the full Standard Model gauge symmetry into the effective field theory description of flavor processes, using semileptonic decays as paradigmatic examples. Depending on the dynamics…

High Energy Physics - Phenomenology · Physics 2015-09-23 Oscar Catà , Martin Jung

We propose a model for combining the Standard Model (SM) with gravity. It relies on a non-minimal coupling of the Higgs field to the Ricci scalar and on the Palatini formulation of gravity. Without introducing any new degrees of freedom in…

High Energy Physics - Theory · Physics 2021-05-31 Mikhail Shaposhnikov , Andrey Shkerin , Sebastian Zell

We study electroweak symmetry breaking involving the seesaw mechanism of quark condensation. These models produce a composite Higgs boson involving the left-handed top quark, yet the top mass arises naturally at the observed scale. We…

High Energy Physics - Phenomenology · Physics 2009-09-11 R. Sekhar Chivukula , Bogdan A. Dobrescu , Howard Georgi , Christopher T. Hill

We introduce the idea of bosonic see-saw mechanism in analogy with the see-saw mechanism. Bosonic see-saw is a new symmetry breaking mechanism and we apply it to explain electroweak symmetry breaking as an inevitable consequence of…

High Energy Physics - Phenomenology · Physics 2008-11-26 Hyung Do Kim

We study the viability of electroweak baryogenesis in a two Higgs doublet model scenario augmented by vector-like, electroweakly interacting fermions. Considering a limited, but illustrative region of the model parameter space, we obtain…

High Energy Physics - Phenomenology · Physics 2015-06-19 Wei Chao , Michael J. Ramsey-Musolf

In the general Two-Higgs Doublet Model it has been shown that the Higgs potential can be expressed in terms of gauge-independent quantities. In particular, stability, electroweak symmetry breaking, and CP symmetry can be understood in a…

High Energy Physics - Phenomenology · Physics 2022-12-28 Lohan Sartore , Markos Maniatis , Ingo Schienbein , Bjoern Herrmann

The standard model of particle physics is analyzed for the case of a Higgs potential not favoring spontaneous electroweak symmetry breaking to gain insight into the physics of the standard model. Electroweak breaking still takes place, and…

High Energy Physics - Phenomenology · Physics 2009-10-31 Stuart Samuel

We study the dynamics of electroweak symmetry-breaking in an extension of the Standard Model where the Higgs sector is augmented by the addition of a real (Y = 0) isospin triplet. We show that this scenario exhibits a novel, two-step…

High Energy Physics - Phenomenology · Physics 2014-04-16 Hiren H. Patel , Michael J. Ramsey-Musolf

We present a primer on the Standard Model of the electroweak interaction. Emphasis is given to the historical aspects of the theory's formulation. The radiative corrections to the Standard Model are presented and its predictions for the…

High Energy Physics - Phenomenology · Physics 2007-05-23 S. F. Novaes

The production of three Higgs bosons at hadron colliders can be enhanced by a double-resonant effect in the $\mathbb{Z}_2$-symmetric two-real-singlet extension of the Standard Model, making it potentially observable in future LHC runs. The…

High Energy Physics - Phenomenology · Physics 2025-10-03 Osama Karkout , Andreas Papaefstathiou , Marieke Postma , Gilberto Tetlalmatzi-Xolocotzi , Jorinde van de Vis , Tristan du Pree

The Higgs boson offers a unique window to hidden sector fields S_i, singlets under the Standard Model gauge group, via the renormalizable interactions |H|^2 S_i^2. We prove that such interactions can provide new patterns for electroweak…

High Energy Physics - Phenomenology · Physics 2008-11-26 Jose Ramon Espinosa , Mariano Quiros

In this paper, we construct an effective model that describes the electroweak symmetry breaking sector by means of composite Higgs-like scalars, following the ideas of Minimal Walking Technicolor (MWT). We argue that, because of the general…

High Energy Physics - Phenomenology · Physics 2010-03-19 Alfonso R. Zerwekh

We consider a minimal model where the Higgs boson arises as an elementary pseudo-Nambu-Goldstone boson. The model is based on an extended scalar sector with global SO(5)/SO(4) symmetry. To achieve the correct electroweak symmetry breaking…

High Energy Physics - Phenomenology · Physics 2018-08-15 Helene Gertov , Sofie Gregersen , Francesco Sannino , Kimmo Tuominen

We present a new complete analysis of the electroweak precision observables within the recently proposed 4-site Higgsless model, which is based on the SU(2)_L x SU(2)_1 x SU(2)_2 x U(1)_Y gauge symmetry and predicts six extra gauge bosons,…

High Energy Physics - Phenomenology · Physics 2015-03-19 Elena Accomando , Diego Becciolini , Stefania De Curtis , Daniele Dominici , Luca Fedeli

The present experimental and theoretical knowledge of the physics of electroweak symmetry breaking is reviewed. Data still favor a light Higgs boson, of a kind that can be comfortably accommodated in the Standard Model or in its Minimal…

High Energy Physics - Phenomenology · Physics 2009-11-07 Fabio Zwirner

In this paper we present the Weiberg-Salam-Glashow model of the electroweak interactions. With a specific choice of parameters can be obtained massive Z and W$^{\pm}$ bosons , while keeping the photon massless. These results are obtained by…

General Physics · Physics 2017-06-01 Voicu Dolocan

We review the realization of the Brout-Englert-Higgs mechanism in the electroweak theory and describe the experimental and theoretical constraints on the mass of the single Higgs boson expected in the minimal Standard Model. We also discuss…

High Energy Physics - Phenomenology · Physics 2009-09-11 John Ellis , Giovanni Ridolfi , Fabio Zwirner

This paper includes two main parts. In the first part, we present generalized gauge models based on SU(3)_C x SU(4)_L x U(1)_X (3-4-1) gauge group with arbitrary electric charge of leptons. The mixing matrix of neutral gauge bosons is…

High Energy Physics - Phenomenology · Physics 2016-07-13 H. N. Long , L. T. Hue , D. V. Loi

We review the constraints on Higgs boson properties from effective potential methods. In the Standard Model, the requirement of stability (or metastability) of the standard electroweak minimum puts an upper bound on the scale of new physics…

High Energy Physics - Phenomenology · Physics 2016-11-03 M. Quiros

I review constraints on the Standard Model (SM) Higgs boson from high energy electroweak (EW) precision data. The same data set also strongly limits various mixing effects of hypothetical extra neutral gauge bosons (Z') with the ordinary Z.…

High Energy Physics - Phenomenology · Physics 2009-07-07 Jens Erler