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pro vyhledávání: '"Coy, Rupert"'
We study a scenario in which the expansion of the early universe is driven by a hot hidden sector (HS) with an initial temperature $T'$ that is significantly higher than that of a visible sector (VS), $T' \gg T$. The latter is assumed to be made of S
Externí odkaz:
http://arxiv.org/abs/2405.10792
Autor:
Coy, Rupert
A weak-doublet with hypercharge $-3/2$ is one of only a handful of fermions which has a renormalisable interaction with Standard Model fields. This should make it worthy of attention, but it has thus far received little consideration in the literatur
Externí odkaz:
http://arxiv.org/abs/2301.12120
Autor:
Coy, Rupert, Gupta, Aritra
In an earlier work, we showed that in very simple neutrino portal-like extensions of the Standard Model it is possible to achieve a one-to-one correspondence between dark matter physics and the seesaw parameters controlling the genesis of neutrino ma
Externí odkaz:
http://arxiv.org/abs/2211.05091
Autor:
Coy, Rupert, Schmidt, Michael A.
A sterile neutrino with a keV-scale mass is a compelling dark matter candidate. We propose a new production mechanism involving the decay and annihilation of a complex scalar singlet with a Higgs portal coupling which develops a vacuum expectation va
Externí odkaz:
http://arxiv.org/abs/2204.08795
Publikováno v:
JHEP 06 (2022) 093
The Sommerfeld enhancement plays an important role in dark matter (DM) physics, and can significantly enhance the annihilation cross section of non-relativistic DM particles. In this paper, we study the effect of neutrino forces, which are generated
Externí odkaz:
http://arxiv.org/abs/2203.05455
Autor:
Coy, Rupert, Frigerio, Michele
New physics in the lepton sector may account for neutrino masses, affect electroweak precision observables, induce charged-lepton flavour violation, and shift dipole moments. The low-energy predictions of different models are most conveniently compar
Externí odkaz:
http://arxiv.org/abs/2110.09126
Autor:
Coy, Rupert, Xu, Xun-Jie
We consider the light $Z'$ explanation of the muon $g-2$ anomaly. Even if such a $Z'$ has no tree-level coupling to electrons, in general one will be induced at loop-level. We show that future beam dump experiments are powerful enough to place string
Externí odkaz:
http://arxiv.org/abs/2108.05147
Publikováno v:
Phys. Rev. D 104, 055021 (2021)
We consider, in general terms, the possible parameter space of thermal dark matter candidates. We assume that the dark matter particle is fundamental and was in thermal equilibrium in a hidden sector with a temperature $T'$, which may differ from tha
Externí odkaz:
http://arxiv.org/abs/2105.01263
Publikováno v:
Phys. Rev. D.104.083024 (2021)
In this article, we show that in the usual type-I seesaw framework, augmented solely by a neutrino portal interaction, the dark matter (DM) relic density can be created through freeze-in in a manner fully determined by the seesaw interactions and the
Externí odkaz:
http://arxiv.org/abs/2104.00042
We consider simultaneous explanations of the electron and muon $g-2$ anomalies through a single $Z'$ of a $U(1)'$ extension to the Standard Model (SM). We first perform a model-independent analysis of the viable flavour-dependent $Z'$ couplings to le
Externí odkaz:
http://arxiv.org/abs/2102.07781