Minimal asymmetric dark matter

2015

J. High Energ. Phys.

119

130

Abstract:We complete the calculation of the wino-nucleon scattering cross section up to the next-to-leading order in α s . We assume that the other sparticles are decoupled and wino interacts with the Standard Model particles via the weak interaction. As a result, the uncertainties coming from the perturbative QCD are significantly reduced to be smaller than those from the nucleon matrix elements. The resultant scattering cross section is found to be larger than the leading-order one by about 70%, which is well above the neutrino background. In the limit of large wino mass the spin-independent scattering cross section with proton turns out σ −0.4 × 10 −47 cm 2 (errors come from perturbative calculation and input parameters, respectively). The computation for a generic SU(2) L multiplet dark matter is also presented.

Section: Electroweakly-interacting Dmmentioning

confidence: 99%

QCD effects on direct detection of wino dark matter

Hisano

Ishiwata

2015

J. High Energ. Phys.

119

130

“…In general, the neutral component of a SU(2) L ⊗ U(1) Y multiplet can interact with SM particles through exchange of W or Z boson, and thus can be a good DM candidate. Such DM candidates have been widely studied in the literature [79][80][81][82][83][84][85][86][87][88][89][90][91][92].…”

Section: Jhep10(2015)193mentioning

confidence: 99%

Weakly-interacting massive particles in non-supersymmetric SO(10) grand unified models

Olive

Zheng

2015

J. High Energ. Phys.

Non-supersymmetric SO(10) grand unified theories provide a framework in which the stability of dark matter is explained while gauge coupling unification is realized. In this work, we systematically study this possibility by classifying weakly interacting dark matter candidates in terms of their quantum numbers of SU(2) L ⊗ U(1) Y , B − L, and SU(2) R . We consider both scalar and fermion candidates. We show that the requirement of a sufficiently high unification scale to ensure a proton lifetime compatible with experimental constraints plays a strong role in selecting viable candidates. Among the scalar candidates originating from either a 16 or 144 of SO(10), only SU(2) L singlets with zero hypercharge or doublets with Y = 1/2 satisfy all constraints for SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(3) C ⊗ SU(2) L ⊗ SU(2) R ⊗ U(1) B−L intermediate scale gauge groups. Among fermion triplets with zero hypercharge, only a triplet in the 45 with intermediate group SU(4) C ⊗ SU(2) L ⊗ SU(2) R leads to solutions with M GUT > M int and a long proton lifetime. We find three models with weak doublets and Y = 1/2 as dark matter candidates for the SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(4) C ⊗ SU(2) L ⊗ U(1) R intermediate scale gauge groups assuming a minimal Higgs content. We also discuss how these models may be tested at accelerators and in dark matter detection experiments.

“…12 The Yukawa interaction (67) comes from the coupling 16 * 16 f 45 W where 16 f is the multiplet composed of the third generation SM fermions and righthanded neutrino. G SM is broken by the VEV of the following doublets: (1, 2, 2) R of 10 R , (15,2,2) C of 126 C , and (10, 2, 2) C of 210 R . The SM Higgs doublet is a mixture of the above doublets.…”

Section: Asymmetry Transfer By Yukawa Couplingmentioning

confidence: 99%

“…To ensure such slow decay, we need to set ∆m ≡ m t R − m χ < m t so that the two-body decay channel t R → tχ is kinematically forbidden. 15 The dominant decay channel is then the three-body decay t R → bW χ i , i = 1, 2, 3 represents three mass eigenstates of ψ 0 D − ψ S mixing, and for simplicity we assume t R can decay to all of them, so that the decay rate is not suppressed by the mixing angle. The decay occurs after χ-χ annihilation if Γt R < H| T f , where m χ /T f ∼ 20 is the decoupling temperature of the annihilation.…”

Section: Asymmetry Transfer By Yukawa Couplingmentioning

confidence: 99%

“…[10] that the out-of-equilibrium decay scenario (the leading mechanism for generating a baryon asymmetry at the time) would indeed provide an asymmetry in a fourth generation neutrino comparable to the baryon asymmetry. The possible connection between the relatively similar baryon and dark matter densities has since been a motivating factor for current models of asymmetric dark matter [11][12][13][14][15][16] (for reviews of asymmetric dark matter, see Ref. [17]).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric dark matter models in SO(10)

J. Cosmol. Astropart. Phys.

Olive

Zheng

2017

We systematically study the possibilities for asymmetric dark matter in the context of non-supersymmetric SO(10) models of grand unification. Dark matter stability in SO(10) is guaranteed by a remnant Z 2 symmetry which is preserved when the intermediate scale gauge subgroup of SO(10) is broken by a 126 dimensional representation. The asymmetry in the dark matter states is directly generated through the out-of-equilibrium decay of particles around the intermediate scale, or transferred from the baryon/lepton asymmetry generated in the Standard Model sector by leptogenesis. We systematically classify possible asymmetric dark matter candidates in terms of their quantum numbers, and derive the conditions for each case that the observed dark matter density is (mostly) explained by the asymmetry of dark matter particles.