Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data

In the scenario that dark matter (DM) is a weakly interacting massive particle, there are many possibilities of the interactions with the Standard Model (SM) particles to achieve the relic density of DM. In this paper, we consider a simple DM model where the DM candidate is a complex scalar boson. The model contains a new complex gauge singlet scalar boson and a new fermion whose gauge charge is the same as the right-handed down-type quark. We dub the new fermion the bottom partner. These new particles have Yukawa interactions with the SM down-type quarks. The DM candidate interacts with the SM particles through the Yukawa interactions. The Yukawa interactions are not only relevant to the annihilation process of the DM but also contribute to the flavor physics, such as the ∆F = 2 processes. In addition, the flavor alignment of the Yukawa couplings is related to the decay modes of the bottom partner, and thus we can find the explicit correlations among the physical observables in DM physics, flavor physics, and the signals at the LHC. We survey the ∆F = 2 processes based on the numerical analyses of the thermal relic density, the direct detection of the DM, and the current LHC bounds. We investigate the perturbative bound on the Yukawa coupling as well. A Study of a fermionic DM model with extra scalar quarks is also given for comparison.

Section: Jhep03(2017)058mentioning

confidence: 76%

“…the cross section has been reported by the Fermi-LAT collaboration [30]. Assuming that s-wave contribution is dominant in DM annihilations, the lower bound on the DM mass reaches about 200 GeV [30].…”

Section: Jhep03(2017)058mentioning

confidence: 81%

Dark matter physics, flavor physics and LHC constraints in the dark matter model with a bottom partner

Abe

Kawamura

Okawa

et al. 2017

“…The indirect detection constraints from CMB measurements [34], gamma-ray measurements from dwarf galaxies [35,36] and the inner galactic region [37] and e + flux measurement from AMS-02 [38]. The next constraints we consider are the gamma ray observations from Fermi-LAT and MAGIC in dwarf galaxies [35,36].…”

Section: Indirect Constraints From Cmb Gamma-ray and E ± Measurementsmentioning

confidence: 99%

“…The lack of evidence for weakly interacting massive particles (WIMPs) in direct detection (DD) experiments [30][31][32][33], increasingly strong constraints on thermal WIMPs from indirect detection (ID) experiments [34][35][36][37][38], and non-observation of beyond the Standard Model (BSM) missing transverse energy signatures at the LHC [39,40], combine to an increasing unease with the standard WIMP miracle paradigm. On the other hand, dark matter coupled to kinetically mixed hidden photons suffers from strong direct detection constraints (see, e.g., [41]).…”

Section: Introductionmentioning

confidence: 99%

A tale of two portals: testing light, hidden new physics at future e + e − colliders

Liu

Wang

2017

We investigate the prospects for producing new, light, hidden states at a future e + e − collider in a Higgsed dark U(1) D model, which we call the Double Dark Portal model. The simultaneous presence of both vector and scalar portal couplings immediately modifies the Standard Model Higgsstrahlung channel, e + e − → Zh, at leading order in each coupling. In addition, each portal leads to complementary signals which can be probed at direct and indirect detection dark matter experiments. After accounting for current constraints from LEP and LHC, we demonstrate that a future e + e − Higgs factory will have unique and leading sensitivity to the two portal couplings by studying a host of new production, decay, and radiative return processes. Besides the possibility of exotic Higgs decays, we highlight the importance of direct dark vector and dark scalar production at e + e − machines, whose invisible decays can be tagged from the recoil mass method.

“…These limits of the annihilation cross section of DM reach to O(10 −25 )[cm 3 /s] and the parameter region discussed in present paper is competing with these bounds. We consider the recent experimental results obtained by the Fermi-LAT [81] and AMS-02 [82]. The former observes gamma rays coming from the dwarf spheroidal satellite galaxies (dSphs) of the Milky Way and the latter observes anti-protons coming from dark matter annihilations in the Milky Way.…”

Section: Indirect Detectionmentioning

confidence: 99%

Study of dark matter physics in non-universal gaugino mass scenario

Kawamura

Omura

2017

Abstract:We study dark matter physics in the Minimal Supersymmetric Standard Model with non-universal gaugino masses at the unification scale. In this scenario, the specific ratio of wino and gluino masses realizes the electro-weak scale naturally and achieves 125 GeV Higgs boson mass. Then, relatively light higgsino is predicted and the lightest neutral particle, that is dominantly given by the neutral component of higgsino, is a good dark matter candidate. The direct detection of the dark matter is sensitive to not only a higgsino mass but also gaugino masses significantly. The upcoming XENON1T experiment excludes the parameter region where bino or gluino is lighter than about 2.5 TeV if the higgsino and the gaugino mass parameters have same signs. We see that the direct detection of dark matter gives stronger bound than the direct search at the LHC experiment when higgsino gives sizable contribution to the dark matter abundance.