Gamma-ray Line from Nambu-Goldstone Dark Matter in a Scale Invariant Extension of the Standard Model

Abstract

A recently proposed scale invariant extension of the standard model is modified such that it includes a Dark Matter candidate which can annihilate into gamma-rays. For that a non-zero $U(1{)}_Y$ hypercharge $Q$ is assigned to the fermions in a QCD-like hidden sector. The Nambu-Goldstone bosons, that arise due to dynamical chiral symmetry breaking in the hidden sector, are cold Dark Matter candidates, and the extension allows them to annihilate into two photons, producing a gamma-ray line spectrum. We find that the gamma-ray line energy must be between 0.7 TeV and 0.9 TeV with the velocity-averaged annihilation cross section $10^{-30}\sim 10^{-26}$ cm^3/s for $Q=1/3$. With a non-zero hypercharge $Q$, the hidden sector is no longer completely dark and can be directly probed by collider experiments.

arXiv comment21 Pages, 8 Figures. Typos corrected, references added, the section about the properties of the dark matter in our model is extended. Result and conclusion unchanged. To appear in JHEP

References in corpus (33)

• QCD Phenomenology based on a Chiral Effective Lagrangian
• First results from the LUX dark matter experiment at the Sanford Underground Research Facility
• Dark Matter Results from 225 Live Days of XENON100 Data
• Higgs mass and vacuum stability in the Standard Model at NNLO
• Investigating the near-criticality of the Higgs boson
• Echoes of a Hidden Valley at Hadron Colliders
• Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters
• Higgs boson mass and new physics
• Conformal Symmetry and the Standard Model
• Classically Conformal B-L extended Standard Model
• Phenomenology of Hidden Valleys at Hadron Colliders
• Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• Electroweak Symmetry Breaking induced by Dark Matter
• Emergence of the Electroweak Scale through the Higgs Portal
• Scale invariant extension of the standard model with strongly interacting hidden sector
• The Next-to-Minimal Coleman-Weinberg Model
• Electroweak Higgs as a pseudo-Goldstone boson of broken scale invariance
• Physical Naturalness and Dynamical Breaking of Classical Scale Invariance
• Natural Electroweak Symmetry Breaking from Scale Invariant Higgs Mechanism
• Planck Scale Boundary Conditions and the Higgs Mass
• Inflation and Dark Matter in the Higgs Portal of Classically Scale Invariant Standard Model
• Electroweak and Conformal Symmetry Breaking by a Strongly Coupled Hidden Sector
• Effective Action, Conformal Anomaly and the Issue of Quadratic Divergences
• Higgs vacuum stability from the dark matter portal
• Leptogenesis and Neutrino Oscillations in the Classically Conformal Standard Model with the Higgs Portal
• Electroweak symmetry breaking and cold dark matter from strongly interacting hidden sector
• Dark Matter in Classically Scale-Invariant Two Singlets Standard Model
• Electroweak breaking and Dark Matter from the common scale
• Testing Higgs portal dark matter via $Z$ fusion at a linear collider
• Naturalness, Conformal Symmetry and Duality
• Symmetry breaking induced by top quark loops from a model without scalar mass
• Flat Higgs Potential from Planck Scale Supersymmetry Breaking

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• Dark matter monopoles, vectors and photons
• Gravitational Waves from Hidden QCD Phase Transition
• A Radiative Model for the Weak Scale and Neutrino Mass via Dark Matter
• Majorana dark matter in a classically scale invariant model
• Gravitational wave from dark sector with dark pion
• Evolving Planck Mass in Classically Scale-Invariant Theories
• Nambu-Goldstone Dark Matter in a Scale Invariant Bright Hidden Sector
• Scale genesis and gravitational wave in a classically scale invariant extension of the standard model
• Genesis of electroweak and dark matter scales from a bilinear scalar condensate
• AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector
• Dark chiral symmetry breaking and the origin of the electroweak scale
• Gravitational waves from chiral phase transition in a conformally extended standard model
• Scale and electroweak first-order phase transitions
• Inflation and dark matter after spontaneous Planck scale generation by hidden chiral symmetry breaking
• Non-perturbative electroweak-scalegenesis on the test bench of dark matter detection
• Scale and confinement phase transitions in scale invariant $SU(N)$ scalar gauge theory
• Heavy Dark Matter, Neutrino Masses and Higgs Naturalness from a Strongly Interacting Hidden Sector
• A mechanism to generate varying speed of light via Higgs-dilaton coupling: Theory and cosmological applications