Asia-Pacific Workshop on Particle Physics and Cosmology 2021

Session

Dark matter 1

2 Aug 2021, 11:30

Online

Conveners

Dark matter 1

• Hyun Min Lee (CAU - Chung-Ang University (KR))

Dark matter 1

• Chuan-Ren Chen (National Taiwan Normal University)

Contribution list Timetable

2. Early kinetic decoupling and Higgs invisible decay in simple dark matter models

Tomohiro Abe (Tokyo University of Science)

02/08/2021, 11:30

We revisit the Higgs-invisible decay branching ratio in Higgs-portal dark matter models. If the mass of the dark matter is slightly below the half of the mass of the Higgs boson, then pairs of the DM particles annihilate into the SM particles efficiently thanks to the Higgs resonance. The DM-Higgs coupling is required to be small to obtain the right amount of the dark matter relic abundance....

3. Does existence of dark matter imply grand unification?

Yoshihiko Abe (Kyoto Univ.)

02/08/2021, 11:45

A pseudo-Nambu-Goldstone boson (pNGB) is an attractive dark matter candidate escaping naturally the severe direct ditection constraint. In the previous work, we discussed pNGB dark matter from gauged U(1)_{B-L} model. In this work, we will consider the further UV completion of the pNGB dark matter model via embedding to a SO(10) grand unified theory. The grand unification determines the some...

4. Flux-mediated Dark Matter

Ji-Seon Song (Chung-Ang University)

02/08/2021, 12:00

We propose a new mechanism to communicate between fermion dark matter and the Standard Model (SM) only through the four-form flux. The four-form couplings are responsible for the relaxation of the Higgs mass to the correct value and the initial displacement of the reheating pseudo-scalar field from the minimum. We show that the simultaneous presence of the pseudo-scalar coupling to fermion...

5. Chiral Composite Asymmetric Dark Matter

Keiichi Watanabe (ICRR)

02/08/2021, 12:15

The asymmetric dark matter (ADM) scenario solves the baryon-dark matter coincidence problem when the dark matter (DM) mass is of O(1)GeV. Composite ADM models based on QCD-like strong dynamics are particularly motivated since the strong dynamics naturally provides the DM mass of O(1) GeV and the large annihilation cross-section simultaneously. In those models, the sub- GeV dark photon often...

6. The domain of thermal dark matter candidates

Rupert Coy (ULB)

02/08/2021, 14:00

I will consider the possible parameter space of thermal dark matter candidates, starting from the assumption that the dark matter particle is fundamental and was in thermal equilibrium in a hidden sector with a temperature T', which may differ from that of the Standard Model temperature, T. The candidates lie in a region in the T'/T vs. m_{dm} plane, which is bounded by both theoretical and...

7. Freezing In with Lepton Flavored Fermions

Shiuli Chatterjee (Indian Institute of Science)

02/08/2021, 14:30

Dark, chiral fermions carrying lepton flavor quantum numbers are natural candidates for freeze-in. Small couplings with the Standard Model fermions of the order of lepton Yukawas are ‘automatic’ in the limit of Minimal Flavor Violation. In the absence of total lepton number violating interactions, particles with certain representations under the flavor group remain absolutely stable. For...

8. Effects of New Heavy Fermions on Complex Scalar Dark Matter Phenomenology in Gauged Two Higgs Doublet Model

Bayu Dirgantara (Suranaree University of Technology)

02/08/2021, 14:45

We study the inclusion of new heavy fermions on complex scalar dark matter (DM) phenomenology within gauged two Higgs doublet model (G2HDM). We find that for DM mass above 1 TeV, heavy quarks coannihilations into the Standard Model (SM) quarks and gluons dominate the thermally-averaged cross section relevant for the relic abundance of complex scalar DM. We demonstrate that the effects of QCD...