PAMELA Results on the Cosmic-Ray Antiproton Flux from 60 MeV to 180 GeV in Kinetic Energy

We show that within MSSM singlet extensions the experimental hints beyond the standard model from the Fermi LAT telescope as well as from the LHC can be explained simultaneously while being consistent with all experimental constraints. In particular we present an example point which features a ∼ 130 GeV lightest neutralino with an annihilation cross section into photons consistent with the indication from the Fermi satellite with simultaneously the right relic abundance, a continuum photon spectrum consistent with observation, direct detection cross section below the experimental limits, electroweak observables consistent with experiment and a 125 GeV light Higgs boson with a slightly enhanced h → γγ rate.

Section: Jhep01(2013)124contrasting

confidence: 57%

Enhanced diphoton rates at Fermi and the LHC

Schmidt-Hoberg

Staub²,

Winkler

2013

“…For the collider study in the later section, we have scanned the parameter space (v s , c 1 , c 2 ), in the ranges of 55 GeV ≤ v s ≤ 200 GeV and 0 < c 1,2 ≤ 10, for a given axion mass, having in mind the Fermi gamma-ray line and the relic density condition. We note that the continuum photons coming from W W, ZZ, Zγ are consistent with the gamma-ray [3] and anti-proton [58,59] constraints as well as the shape of the gamma-ray line spectrum [60][61][62][63][64].…”

Section: Jhep03(2013)052supporting

confidence: 78%

“…We find that when the Z Z channel is subdominant, the CS coupling for the W -boson should be larger than the one for the Z-boson by order of magnitude. We note that the continuum photons coming from the WW channel and other channels without monophotons are consistent with the gamma-ray [3] and anti-proton [58,59] constraints and can be also compatible with the shape of the line spectrum [60][61][62][63][64]. Now we comment on the case that the top quark couples to the Z gauge boson with the same Z charge as dark matter.…”

Section: Jhep03(2013)052supporting

confidence: 74%

Interplay between Fermi gamma-ray lines and collider searches

Lee¹,

Park

Sanz

2013

We explore the interplay between lines in the gamma-ray spectrum and LHC searches involving missing energy and photons. As an example, we consider a singlet Dirac fermion dark matter with the mediator for Fermi gamma-ray line at 130 GeV. A new chiral or local U(1) symmetry makes weak-scale dark matter natural and provides the axion or Z gauge boson as the mediator connecting between dark matter and electroweak gauge bosons. In these models, the mediator particle can be produced in association with a monophoton at colliders and it produces large missing energy through the decays into a DM pair or ZZ, Zγ with at least one Z decaying into a neutrino pair. We adopt the monophoton searches with large missing energy at the LHC and impose the bounds on the coupling and mass of the mediator field in the models. We show that the parameter space of the Z mediation model is already strongly constrained by the LHC 8TeV data, whereas a certain region of the parameter space away from the resonance in axion-like mediator models are bounded. We foresee the monophoton bounds on the Z and axion mediation models at the LHC 14 TeV.

“…As already pointed out in ref. [37], this antiproton flux can be larger than the one observed by the PAMELA experiment [38], resulting in a constraint on the DM mass that is complementary to the direct detection one. One should keep in mind, however, the large astrophysical uncertainty of these observations, mainly due to the propagation of charged particles in the Galaxy.…”

Section: Jhep07(2012)015mentioning

confidence: 88%

Composite scalar dark matter

Frigerio

Pomarol

Riva

et al. 2012

155

227

We show that the dark matter (DM) could be a light composite scalar η, emerging from a TeV-scale strongly-coupled sector as a pseudo Nambu-Goldstone boson (pNGB). Such state arises naturally in scenarios where the Higgs is also a composite pNGB, as in O(6)/O(5) models, which are particularly predictive, since the low-energy interactions of η are determined by symmetry considerations. We identify the region of parameters where η has the required DM relic density, satisfying at the same time the constraints from Higgs searches at the LHC, as well as DM direct searches. Compositeness, in addition to justify the lightness of the scalars, can enhance the DM scattering rates and lead to an excellent discovery prospect for the near future. For a Higgs mass m h 125 GeV and a pNGB characteristic scale f 1 TeV, we find that the DM mass is either m η 50−70 GeV, with DM annihilations driven by the Higgs resonance, or in the range 100−500 GeV, where the DM derivative interaction with the Higgs becomes dominant. In the former case the invisible Higgs decay to two DM particles could weaken the LHC Higgs signal.