Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userExplaining the ANITA events by a $L_e-L_tau$ gauge model
57
0
0.0
(
0
)
Ask ChatGPT about the research
No Arabic abstract
The ANITA experiment has registered two anomalous events that can be interpreted as $ u_tau$ or $bar{ u}_tau$ with a very high energy of $mathcal{O}(0.6)$~EeV emerging from deep inside the Earth. At such high energies, the Earth is opaque to neutrinos so the emergence of these neutrinos at such large zenith angles is a mystery. In our paper, we present a model that explains the two anomalous events through a $L_e -L_tau$ gauge interaction involving two new Weyl fermions charged under the new gauge symmetry. We find that, as a bonus of the model, the lighter Weyl fermion can be a dark matter component. We discuss how the ANITA observation can be reconciled with the IceCube and Auger upper bounds. We also demonstrate how this model can be tested in future by collider experiments.
rate research
Read More
In this work, we consider the implementation of $U(1)_{L_e-L_tau}$ gauge symmetry to study the neutrino phenomenology within the framework of type-(I+II) seesaw. The model involves three right-handed neutrinos, a scalar singlet along with a scalar triplet in addition to the standard model particle spectrum. The neutrino mass matrix is found to acquire a simple texture two-zero structure and thus, turns out to be quite helpful in explaining the neutrino oscillation parameters and also accommodating the effective electron neutrino mass ($m_{ee}$) in neutrinoless double beta decay. We also briefly discuss the lepton flavor violating $tau$ decays $tau to e gamma$ and $tau to mu bar mu mu$ in this model.
We explain the two upgoing ultra-high energy shower events observed by ANITA as arising from the decay in the Earths interior of the quasi-stable dark matter candidate in the CPT symmetric universe. The dark matter particle is a 480 PeV right-handed neutrino that decays into a Higgs boson and a light Majorana neutrino. The latter interacts in the Earths crust to produce a tau lepton that in turn initiates an atmospheric upgoing shower. The fact that both events emerge at the same angle from the Antarctic ice-cap suggests an atypical dark matter density distribution in the Earth.
We propose a flavored $U(1)_{emu}$ neutrino mass and dark matter~(DM) model to explain the recent DArk Matter Particle Explorer (DAMPE) data, which feature an excess on the cosmic ray electron plus positron flux around 1.4 TeV. Only the first two lepton generations of the Standard Model are charged under the new $U(1)_{emu}$ gauge symmetry. A vector-like fermion $psi$, which is our DM candidate, annihilates into $e^{pm}$ and $mu^{pm}$ via the new gauge boson $Z$ exchange and accounts for the DAMPE excess. We have found that the data favors a $psi$ mass around 1.5~TeV and a $Z$ mass around 2.6~TeV, which can potentially be probed by the next generation lepton colliders and DM direct detection experiments.
We explain the $e^+ e^-$ excess observed by the DAMPE Collaboration using a dark matter model based upon the Higgs triplet model and an additional hidden $SU(2)_X$ gauge symmetry. Two of the $SU(2)_X$ gauge bosons are stable due to a residual discrete symmetry and serve as the dark matter candidate. We search the parameter space for regions that can explain the observed relic abundance, and compute the flux of $e^+ e^-$ coming from a nearby dark matter subhalo. With the inclusion of background cosmic rays, we show that the model can render a good fit to the entire energy spectrum covering the AMS-02, Fermi-LAT and DAMPE data.
We study the possibility to directly detect the boosted dark matter generated from the scatterings with high energetic cosmic particles such as protons and electrons. As a concrete example, we consider the sub-GeV dark matter mediated by a $U(1)_D$ gauge boson which has mixing with $U(1)_Y$ gauge boson in the standard model. The enhanced kinetic energy of the light dark matter from the collision with the cosmic rays can recoil the target nucleus and electron in the underground direct detection experiments transferring enough energy to them to be detectable. We show the impact of BDM with existing direct detection experiments as well as collider and beam-dump experiments.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
