Supersymmetric Theory and Models

“…While the QCD Lagrangian is usually written in terms of 4-component Dirac fermions, for the purpose of understanding the symmetries it is better to think of it in terms of 2 component Weyl spinors. 1 A Dirac spinor can be written as…”

Section: Non-linear Goldstone Fieldsmentioning

confidence: 99%

“…( 2) Λ is merely a stand-in for the mass of a heavy particle that will ultimately regulate these loops. However, this can numerically be different for the three diagrams, thus one should really be talking about the gauge cut-off scale Λ g , the fermion cut-off scale Λ f and the Higgs cut-off scale Λ H , which could all be different by O (1) factors or even more. Thus it is not really meaningful to talk about a Veltman-like condition, unless some symmetry ensures that all these cut-off scales are equal.…”

Section: Introduction: the Hierarchy Problem And Directions For Solving Itmentioning

confidence: 99%

“…This symmetry will ensure that the chiral symmetry of the fermionic partner also protects the Higgs itself from quadratic sensitivity to high scales. For an introduction to supersymmetry see for example [1]. -Composite Higgs [2][3][4][5][6][7][8]: there is no true elementary scalar, rather the Higgs is a bound state of some more fundamental, strongly interacting fermions.…”

Section: Introduction: the Hierarchy Problem And Directions For Solving Itmentioning

confidence: 99%

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Non-supersymmetric BSM models

Csáki

Lombardo

Telem

2021

Eur. Phys. J. Spec. Top.

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We provide a self-contained introduction to the essential aspects of non-supersymmetric beyond the standard model (BSM). After a detailed review of the physical meaning of the hierarchy problem, we introduce the key ingredients of the physics of Goldstone bosons necessary for many non-supersymmetric new physics models. Next, we discuss the concept of collective symmetry breaking and present the main elements leading to little Higgs/composite Higgs models. We then turn to extra dimensional theories. After covering some of the basics of extra dimensional physics, we describe warped extra dimensions and explain how the AdS/CFT correspondence leads to realistic RS models and the holographic minimal composite Higgs model.

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“…The most popular are Supersymmetry (a review can be found in Ref. [71]), technicolor [72][73][74], composite Higgs [75] and warped extra-dimensions [76,77].…”

Section: The Hierarchy Problemmentioning

confidence: 99%

Probing the sterile neutrino portal to Dark Matter with γ rays

Folgado¹,

Gomez-Vargas²,

Rius³

et al. 2018

J. Cosmol. Astropart. Phys.

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Sterile neutrinos could provide a link between the Standard Model particles and a dark sector, besides generating active neutrino masses via the seesaw mechanism type I. We show that, if dark matter annihilation into sterile neutrinos determines its observed relic abundance, it is possible to explain the Galactic Center γ-ray excess reported by the Fermi-LAT Collaboration as due to an astrophysical component plus dark matter annihilations. We observe that sterile neutrino portal to dark matter provides an impressively good fit, with a p-value of 0.78 in the best fit point, to the Galactic Center γ-ray flux, for DM masses in the range (40-80) GeV and sterile neutrino masses 20 GeV M N < M DM . Such values are compatible with the limits from Fermi-LAT observations of the dwarfs spheroidal galaxies in the Milky Way halo, which rule out dark matter masses below ∼ 50 GeV (90 GeV), for sterile neutrino masses M N M DM (M N M DM ). We also estimate the impact of AMS-02 anti-proton data on this scenario.

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Supersymmetric Theory and Models

Abstract: 15 We define the differential operator L i ≡ 1 2 ǫ ijk L jk . Then, noting that L = x × P , it follows that L · P = 0. Hence, J · P = ( L + S) · P = S · P .

Cited by 10 publications

References 196 publications

Lectures on physics beyond the Standard Model

Lectures on physics beyond the Standard Model

Non-supersymmetric BSM models

Probing the sterile neutrino portal to Dark Matter with γ rays

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