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Title: Dark matter with flavor symmetry and its collider signature

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Journal Article: Published Article
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Physics Letters. Section B
Additional Journal Information:
Journal Volume: 740; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-06-01 03:45:51; Journal ID: ISSN 0370-2693
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Ma, Ernest, and Natale, Alexander. Dark matter with flavor symmetry and its collider signature. Netherlands: N. p., 2015. Web. doi:10.1016/j.physletb.2014.11.032.
Ma, Ernest, & Natale, Alexander. Dark matter with flavor symmetry and its collider signature. Netherlands. doi:10.1016/j.physletb.2014.11.032.
Ma, Ernest, and Natale, Alexander. 2015. "Dark matter with flavor symmetry and its collider signature". Netherlands. doi:10.1016/j.physletb.2014.11.032.
title = {Dark matter with flavor symmetry and its collider signature},
author = {Ma, Ernest and Natale, Alexander},
abstractNote = {},
doi = {10.1016/j.physletb.2014.11.032},
journal = {Physics Letters. Section B},
number = C,
volume = 740,
place = {Netherlands},
year = 2015,
month = 1

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Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2014.11.032

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Cited by: 3works
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  • Extending the standard model with three right-handed neutrinos (N{sub k}) and a second Higgs doublet ({eta}), odd under the discrete parity symmetry Z{sub 2}, Majorana neutrino masses can be generated at one-loop order. In the resulting model, the lightest stable particle, either a boson or a fermion, might be a dark matter candidate. Here we assume a specific mass spectrum (M{sub 1}<<M{sub 2}<M{sub 3}<m{sub {eta}}) and derive its consequences for dark matter and collider phenomenology. We show that (i) the lightest right-handed neutrino is a warm dark matter particle that can give a {approx}10% contribution to the dark matter density;more » (ii) several decay branching ratios of the charged scalar can be predicted from measured neutrino data. Especially interesting is that large lepton flavor violating rates in muon and tau final states are expected. Finally, we derive upper bounds on the right-handed neutrino Yukawa couplings from the current experimental limit on Br({mu}{yields}e{gamma})« less
  • We show how gauge coupling unification is successfully implemented through nonsupersymmetric grand unified theory, SO(10)xG{sub f}(G{sub f}=S{sub 4},SO(3){sub f},SU(3){sub f}), using a low-scale flavor-symmetric model of the type SU(2){sub L}xU(1){sub Y}xSU(3){sub C}xS{sub 4} recently proposed by Hagedorn, Lindner, and Mohapatra, while assigning matter-parity discrete symmetry for the dark matter stability. For gauge coupling unification in the single-step-breaking case, we show that a color-octet fermion and a hyperchargeless weak triplet fermionic dark matter are the missing particles needed to complete its minimal supersymmetric standard model-equivalent degrees of freedom. When these are included, the model automatically predicts the nonsupersymmetric grand unification withmore » a scale identical to the minimal supersymmetric standard model/grand unified theory scale. We also find a two-step-breaking model with Pati-Salam intermediate symmetry where the dark matter and a low-mass color-octet scalar or the fermion are signaled by grand unification. The proton-lifetime predictions are found to be accessible to ongoing or planned searches in a number of models. We discuss the grand unified origin of the light fermionic triplet dark matter, the color-octet fermion, and their phenomenology.« less
  • We construct a flavor symmetry model based on the tetrahedral group A{sub 4} in which the right-handed neutrinos from the seesaw mechanism can be both keV warm dark matter particles and eV-scale sterile neutrinos. This is achieved by giving the right-handed neutrinos appropriate charges under the same Froggatt-Nielsen symmetry responsible for the hierarchy of the charged lepton masses. We discuss the effect of next-to-leading order corrections to deviate the zeroth order tri-bimaximal mixing. Those corrections have two sources: (i) higher order seesaw terms, which are important when the seesaw particles are eV-scale, and (ii) higher-dimensional effective operators suppressed by additionalmore » powers of the cut-off scale of the theory. Whereas the mixing angles of the active neutrinos typically receive corrections of the same order, the mixing of the sterile neutrinos with the active ones is rather stable as it is connected with a hierarchy of mass scales. We also modify an effective A{sub 4} model to incorporate keV-scale sterile neutrinos.« less
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  • We consider the process of scattering of Galactic cosmic-ray electrons and protons off of dark matter with the radiation of a final-state photon. This process provides a novel way to search for Galactic dark matter with gamma rays. We argue that for a generic weakly interacting massive particle, barring effects such as co-annihilation or a velocity-dependent cross section, the gamma-ray emission from cosmic-ray scattering off of dark matter is typically smaller than that from dark matter pair-annihilation. However, if dark matter particles cannot pair-annihilate, as is the case for example in asymmetric dark matter scenarios, cosmic-ray scattering with final statemore » photon emission provides a unique window to detect a signal from dark matter with gamma rays. We estimate the expected flux level and its spectral features for a generic supersymmetric setup, and we also discuss dipolar and luminous dark matter. We show that in some cases the gamma-ray emission might be large enough to be detectable with the Fermi Large Area Telescope.« less