scholarly journals Gamma-ray line from Nambu-Goldstone dark matter in a scale invariant extension of the Standard Model

2014 ◽  
Vol 2014 (9) ◽  
Author(s):  
Jisuke Kubo ◽  
Kher Sham Lim ◽  
Manfred Lindner
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Gamma Ray ◽  
Scale Invariant ◽  
Invariant Extension ◽  
The Standard Model

Possible manifestations of transitions within the dark matter structure

2021 ◽  
Author(s):  
Vitaly Beylin ◽  
Maxim Bezuglov
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Cross Sections ◽  
Gamma Ray ◽  
Complex Structure ◽  
Final State ◽  
The Standard Model ◽  
Matter Effect ◽  
Matter Sector

In this paper, vector hyperquark extension of the Standard Model with multicomponent dark matter scenario is analyzed. Due to the splitting of dark matter candidates masses, transitions between these components accompanied with final state photons radiation are possible. For these processes, we calculate cross-sections and expected gamma-ray fluxes from regions with an increased density of dark matter. Effect of possible luminescence induced by complex structure of dark matter sector is discussed.

scholarly journals Chapter 5 Dark Matter and New Physics Beyond the Standard Model with LHAASO

2021 ◽  
Author(s):  
Xiaojun Bi
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Gamma Ray ◽  
Galactic Halo ◽  
Effective Area ◽  
High Energy ◽  
New Physics ◽  
Dark Matter Annihilation ◽  
The Standard Model ◽  
Very High Energy

Abstract In order to reveal the nature of dark matter, it is crucial to detect its non-gravitational interactions with the standard model particles. The traditional dark matter searches focused on the so-called weakly interacting massive particles. However, this paradigm is strongly constrained by the null results of current experiments with high precision. Therefore there is a renewed interest of searches for heavy dark matter particles above TeV scale. The Large High Altitude Air Shower Observatory (LHAASO) with large effective area and strong background rejection power is very suitable to investigate the gamma-ray signals induced by dark matter annihilation or decay above TeV scale. In this document, we review the theoretical motivations and background of heavy dark matter. We review the prospects of searching for the gamma-ray signals resulted from dark matter in the dwarf spheroidal satellites and Galactic halo for LHAASO, and present the projected sensitivities. We also review the prospects of searching for the axion-like particles, which are a kind of well motivated light pseudo-scalars, through the LHAASO measurement of the very high energy gamma-ray spectra of astrophysical sources.

scholarly journals Effective field theory analysis of dark matter-standard model interactions with spin one mediators

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Fabiola Fortuna ◽  
Pablo Roig ◽  
José Wudka
Keyword(s):  
Field Theory ◽  
Dark Matter ◽  
Standard Model ◽  
Effective Field Theory ◽  
Gamma Ray ◽  
Direct Detection ◽  
Effective Field ◽  
Indirect Detection ◽  
Theory Analysis ◽  
Invisible Decay

Abstract We analyze interactions between dark matter and standard model particles with spin one mediators in an effective field theory framework. In this paper, we are considering dark particles masses in the range from a few MeV to the mass of the Z boson. We use bounds from different experiments: Z invisible decay width, relic density, direct detection experiments, and indirect detection limits from the search of gamma-ray emissions and positron fluxes. We obtain solutions corresponding to operators with antisymmetric tensor mediators that fulfill all those requirements within our approach.

scholarly journals Search for dark matter in association with an energetic photon in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Dark Matter ◽  
Transverse Momentum ◽  
Standard Model ◽  
Confidence Level ◽  
Axial Vector ◽  
Beyond The Standard Model ◽  
Proton Proton ◽  
Missing Transverse Momentum ◽  
Upper Limits ◽  
The Standard Model

Abstract A search for dark matter is conducted in final states containing a photon and missing transverse momentum in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV. The data, collected during 2015–2018 by the ATLAS experiment at the CERN LHC, correspond to an integrated luminosity of 139 fb−1. No deviations from the predictions of the Standard Model are observed and 95% confidence-level upper limits between 2.45 fb and 0.5 fb are set on the visible cross section for contributions from physics beyond the Standard Model, in different ranges of the missing transverse momentum. The results are interpreted as 95% confidence-level limits in models where weakly interacting dark-matter candidates are pair-produced via an s-channel axial-vector or vector mediator. Dark-matter candidates with masses up to 415 (580) GeV are excluded for axial-vector (vector) mediators, while the maximum excluded mass of the mediator is 1460 (1470) GeV. In addition, the results are expressed in terms of 95% confidence-level limits on the parameters of a model with an axion-like particle produced in association with a photon, and are used to constrain the coupling gaZγ of an axion-like particle to the electroweak gauge bosons.

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