scholarly journals Perspectives for an Elko phenomenology using monojets at the 14 TeV LHC

2014 ◽  
Vol 23 (14) ◽  
pp. 1444005 ◽  
Author(s):  
Alexandre Alves ◽  
M. Dias ◽  
F. de Campos
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Higgs Field ◽  
Mass Term ◽  
Missing Energy ◽  
Fermionic Field ◽  
Future Studies ◽  
Mass Dimension ◽  
Dimension One

The aim of this work is to explore the possibility to discover a fermionic field with mass dimension one, the Elko field, in the 14 TeV Large Hadron Collider (LHC), in processes with missing energy and one jet. We explore the possibility of a triple coupling with the Higgs field, generating also a contribution to the Elko mass term, and suggest some possibilities for future studies in this field.

scholarly journals Searching for Elko dark matter spinors at the CERN LHC

2015 ◽  
Vol 30 (01) ◽  
pp. 1550006 ◽  
Author(s):  
Alexandre Alves ◽  
F. de Campos ◽  
M. Dias ◽  
J. M. Hoff da Silva
Keyword(s):  
Dark Matter ◽  
Hadron Collider ◽  
Higgs Field ◽  
Tree Level ◽  
Dark Matter Candidate ◽  
Mass Dimension ◽  
Quartic Interaction ◽  
Relic Abundance ◽  
Dimension One ◽  
Higgs Portal

The aim of this paper is to explore the possibility of discovering a fermionic field with mass dimension one, the Elko field, in the Large Hadron Collider. Due to its mass dimension, an Elko can only interact either with Standard Model spinors and gauge fields at one-loop order or at tree level through a quartic interaction with the Higgs field. In this Higgs portal scenario, the Elko is a viable candidate to a dark matter constituent which has been shown to be compatible with relic abundance measurements from WMAP and direct dark matter searches. We propose a search strategy for this dark matter candidate in the channel [Formula: see text] at the [Formula: see text] LHC. We show the LHC potential to discover the Elko considering a triple Higgs–Elkos coupling as small as ~0.5 after 1 ab-1 of integrated luminosity. Some phenomenological consequences of this new particle and its collider signatures are also discussed.

scholarly journals Partition function for a mass dimension one fermionic field and the dark matter halo of galaxies

2019 ◽  
Vol 34 (16) ◽  
pp. 1950126 ◽  
Author(s):  
S. H. Pereira ◽  
Richard S. Costa
Keyword(s):  
Dark Matter ◽  
Partition Function ◽  
Pauli Exclusion Principle ◽  
Dark Matter Halo ◽  
Exclusion Principle ◽  
Galactic Halos ◽  
Fermionic Field ◽  
Time Formalism ◽  
Mass Dimension ◽  
Dimension One

This work studies the finite temperature effects of a mass dimension one fermionic field, sometimes called Elko field. The equilibrium partition function was calculated by means of the imaginary time formalism and the result obtained was the same for a Dirac fermionic field, even though the Elko field does not satisfy a Dirac-like equation. The high and low temperature limits were obtained, and for the last case the degeneracy pressure due to Pauli exclusion principle can be responsible for the dark matter halos around galaxies to be greater than or of the same order of the galaxy radius. Also, for a light particle of about 1.0 eV and a density of just 1 particle per cubic centimeter, the value of the total dark matter mass due to Elko particles is of the same order of a typical galaxy. Such a result satisfactorily explains the dark matter as being formed just by Elko fermionic particles and also the existence of galactic halos that go beyond the observable limit.

scholarly journals On the Higgs mass fine-tuning problem with multi-Higgs doublet models

2019 ◽  
Vol 34 (05) ◽  
pp. 1950025 ◽  
Author(s):  
Nabarun Chakrabarty ◽  
Indrani Chakraborty
Keyword(s):  
Large Hadron Collider ◽  
Degrees Of Freedom ◽  
Higgs Mass ◽  
Hadron Collider ◽  
Mass Term ◽  
Higgs Doublet ◽  
Fine Tuning ◽  
Divergent Term ◽  
Dimensional Models ◽  
Manageable Level

With no conclusive signal till date of the minimal supersymmetric and extra-dimensional models at the Large Hadron Collider (LHC), the issue of naturalness of the Higgs mass still calls for attention. One way to achieve that is to introduce additional bosonic degrees of freedom and rely on fine-tuning thereafter. That is, to arrange for a cancellation between various parameters so that the coefficient of the quadratically divergent term in the Higgs mass is vanishing or small to a manageable level. In this work, we explore the possibility of doing so using two- and three-Higgs doublet models. We consider different versions of the same and fold in various relevant constraints accordingly. The study reveals that the quadratically divergent mass term of the 125 GeV Higgs can be exactly canceled in most of the models considered here. However, the same does not hold for the nonstandard scalars owing to the applied constraints.

scholarly journals A new class of mass dimension one fermions

2020 ◽  
Vol 476 (2240) ◽  
pp. 20200249 ◽  
Author(s):  
Dharam Vir Ahluwalia
Keyword(s):  
Dark Matter ◽  
Field Energy ◽  
First Principle ◽  
Square Root ◽  
Identity Matrix ◽  
Quantum Fields ◽  
Fermionic Field ◽  
New Class ◽  
Mass Dimension ◽  
Dimension One

These are notes on the square root of a 4 × 4 identity matrix and associated quantum fields of spin one half. The method is illustrated by constructing a new mass dimension one fermionic field. The presented field is local. The field energy is bounded from below. It is argued that these fermions are a first-principle candidate for dark matter with an unsuppressed quartic self-interaction.

scholarly journals Fermionic degeneracy and non-local contributions in flag-dipole spinors and mass dimension one fermions

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Cheng-Yang Lee
Keyword(s):  
Complex Number ◽  
Invariant Theory ◽  
Matrix Transformation ◽  
Fermionic Field ◽  
Temporal Gauge ◽  
Mass Dimension ◽  
Fermionic Fields ◽  
Non Local ◽  
Dimension One ◽  
Non Locality

AbstractWe construct a mass dimension one fermionic field associated with flag-dipole spinors. These spinors are related to Elko (flag-pole spinors) by a one-parameter matrix transformation $${\mathcal {Z}}(z)$$ Z ( z ) where z is a complex number. The theory is non-local and non-covariant. While it is possible to obtain a Lorentz-invariant theory via $$\tau $$ τ -deformation, we choose to study the effects of non-locality and non-covariance. Our motivation for doing so is explained. We show that a fermionic field with $$|z|\ne 1$$ | z | ≠ 1 and $$|z|=1$$ | z | = 1 are physically equivalent. But for fermionic fields with more than one value of z, their interactions are z-dependent thus introducing an additional fermionic degeneracy that is absent in the Lorentz-invariant theory. We study the fermionic self-interaction and the local U(1) interaction. In the process, we obtained non-local contributions for fermionic self-interaction that have previously been neglected. For the local U(1) theory, the interactions contain time derivatives that renders the interacting density non-commutative at space-like separation. We show that this problem can be resolved by working in the temporal gauge. This issue is also discussed in the context of gravity.

scholarly journals Dark Spinors Hawking Radiation in String Theory Black Holes

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
R. T. Cavalcanti ◽  
Roldão da Rocha
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Standard Model ◽  
Hawking Radiation ◽  
Higgs Field ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Mass Dimension ◽  
Dimension One ◽  
Dilaton Black Holes

The Hawking radiation spectrum of Kerr-Sen axion-dilaton black holes is derived, in the context of dark spinors tunnelling across the horizon. Since a black hole has a well defined temperature, it should radiate in principle all the standard model particles, similar to a black body at that temperature. We investigate the tunnelling of mass dimension one spin-1/2 dark fermions, which are beyond the standard model and are prime candidates to the dark matter. Their interactions with the standard model matter and gauge fields are suppressed by at least one power of unification scale, being restricted just to the Higgs field and to the graviton likewise. The tunnelling method for the emission and absorption of mass dimension one particles across the event horizon of Kerr-Sen axion-dilaton black holes is shown here to provide further evidence for the universality of black hole radiation, further encompassing particles beyond the standard model.

Sign in / Sign up

Export Citation Format

Share Document