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Natural explanation for 130 GeV photon line p p
within vector boson dark matter model
Amin Rezaei Akbarieh
IPP13
(based on: Y.Farzan and A.R.A , arXiv:1211.4685 )
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OutlineOutline• Dark MatterEvidence, Direct and indirect dark matter searches130 or 135 GeVline in FermiLATdata,...
• Our ModelPhenomenological consequences
• ConclusionCo c us o
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Evidence For Dark MatterGalactic rotation curves
Gravitational lensing
Light element abundancesLight element abundances
CMB anisotropies
Large scale structure
Etc…
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What is the nature of DarkWhat is the nature of Dark Matter?Matter?
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Stable
Dark MatterDark Matter
Neutral under color, electromagnetism
Relic density
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Stable
Dark MatterDark Matter
Neutral under color, Spinelectromagnetism
MassRelic density
Mass
PortalPortalProduction
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Production Mechanism
Stable
Dark MatterDark MatterSM
Neutral under color, electromagnetism
Relic density
Free Powerpoint Templates Page 7Beyond the SM
SPIN of dark matter?
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SPIN of dark matter?
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The ModelThe Model
• Y.Farzan and A.R.A, 1211.4685
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However not necessarily renormalizable Vector bosons can be promoted toHowever, not necessarily renormalizable. Vector bosons can be promoted to be gauge bosons By Stuckelberg mechanism.
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Higgs portalHiggs portal
• The dimensionless gauge and Z_2invariant couplings to the Higgs:p g gg
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Annihilation of the V pairAnnihilation of the V pair• Setting V V &
To account for the observed dark matter abundance within the thermal productionscenario , the total DM pair annihilation cross section should be equal to 1 pb.
For
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The total annihilation cross section falls well below the b d f F i LAT ti t i tbound from Fermi-LAT continuum gamma-ray constraint as well as the
bounds from the PAMELA constraint on the anti-proton fluxflux
More data from Fermi LAT and AMS02 may make itMore data from Fermi-LAT and AMS02 may make it possible to probe the model in future.
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Annihilation of the V pairAnnihilation of the V pair
• Setting V V
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Observation favors double line structure over a single gline. however, more data is required to resolve such a double line feature .
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we do not expect an
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pobservable eect in the direct searches.
HIGGS DECAY TO A PHOTON PAIR
These amplitudes have to be summed up with the SM trianglesummed up with the SM triangle diagrams within which top quark and W boson propagate.
Notice that our result is ultra-violet divergent.
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The contribution of 1 will be comparable to that in the SM. Theobserved slight excess can be attributed to this effect.
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DIRECT PRODUCTION AT THECOLLIDERS
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The energy of center in the LEP experiment was too low to allow the production of V and V’ pair.
However, in the LHC, the V and V’ pair can be produced as long as we are in the perturbative regime;as long as we are in the perturbative regime;
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Conclusions
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Backup Slides
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M A k t l [F i LAT C ll b ti ] Ph R L tt 107 (2011) 241302
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M. Ackermann et al. [Fermi-LAT Collaboration], Phys. Rev. Lett. 107 (2011) 241302[arXiv:1108.3546 [astro-ph.HE]].
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