Phenomenology of CP-even ALP

Sakurai, Kodai; Yin, Wen

doi:10.1007/jhep04(2022)113

Cited by 11 publications

(6 citation statements)

References 144 publications

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“…Interestingly, if c j , cx j have sizes of O(1) with generic O(1) CP phases, a behaves as a CPeven ALP [28]. This can be easily found that in any singlet scalar extension, the generic renormalizable potential has the form V full = V full (|H| 2 , ρ, a ).…”

Section: Renormalizable Model For a Generic Light Dark Sector 21 Modelmentioning

confidence: 98%

“…With the generic CP phases residing in c j , cx j , this CP-even ALP can mix with the SM-like and dark CP-even Higgs bosons in the low-energy effective theory and decay into the light components in the SM, like photons. The mixing between the SM-like Higgs boson and ALP can be estimated as [28]…”

Section: Renormalizable Model For a Generic Light Dark Sector 21 Modelmentioning

confidence: 99%

“…m a 20 keV for a dominant DM. The parameter region 200 keV can be tested in the future observations of the 21cm line and milky-way sub-halo count [28].…”

Section: A2 Cosmologymentioning

confidence: 99%

“…In addition, in the case the SM-like Higgs boson does not decay invisibly, collider searches for dark Higgs boson production at the ILC with the center-of-mass energies 250 GeV and 500 GeV were studied in Refs [23] (irrelevant to the dark Higgs boson decay products) and [24], respectively. The invisible decay with either Higgs boson at CLIC was studied in [25] (see also other relevant papers [16,18,[26][27][28]). However, the collider simulation involving productions and decays of both Higgs bosons has not been studied in detail so far.…”

Section: Introductionmentioning

confidence: 99%

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Probing light dark sector at future lepton colliders via (dark) Higgs invisible decays

Haghighat¹,

Najafabadi²,

Sakurai³

et al. 2022

Preprint

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A renormalizable UV model for Axion-Like Particles (ALPs) or hidden photons, that may explain the dark matter usually involves a dark Higgs field which is a singlet under the standard model (SM) gauge group. The dark sector can couple to the SM particles via the portal coupling between the SM-like Higgs and dark Higgs fields. Through this coupling, the dark sector particles can be produced in either the early universe or the collider experiments. Interestingly, not only the SM-like Higgs boson can decay into the light dark bosons, but also a light dark Higgs boson may be produced and decay into the dark bosons in a collider. In this paper, we perform the first collider search for invisible decays by taking both the Higgs bosons into account. We use a multivariate technique to best discriminate the signal from the background. We find that a large parameter region can be probed at the International Linear Collider (ILC) operating at the center-of-mass energy of 250 GeV. In particular, even when the SM-like Higgs invisible decay is a few orders of magnitude below the planned sensitivity reach of the ILC, the scenario can be probed by the invisible decay of the dark Higgs boson produced via a similar diagram. Measuring the dark Higgs boson decay into the dark sector will be a smoking gun signal of the light dark sector. A similar search of the dark sector would be expected in, e.g., Cool Copper Collider (C 3 ), Circular Electron Positron Collider (CEPC), Compact Linear Collider (CLIC) and Future Circular electron-positron Collider (FCC-ee).

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Section: Renormalizable Model For a Generic Light Dark Sector 21 Modelmentioning

confidence: 98%

Section: Renormalizable Model For a Generic Light Dark Sector 21 Modelmentioning

confidence: 99%

“…m a 20 keV for a dominant DM. The parameter region 200 keV can be tested in the future observations of the 21cm line and milky-way sub-halo count [28].…”

Section: A2 Cosmologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing light dark sector at future lepton colliders via (dark) Higgs invisible decays

Haghighat¹,

Najafabadi²,

Sakurai³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, pNGB DM model is also studied under the freeze-in production scenario [19][20][21], which is an alternative paradigm that is capable to evade the stringent direct detection bound. The freeze-in production mechanism requires the DM candidate to feebly interact with the SM particles, so that DM never get into thermal equilibrium with the SM plasma.…”

Section: Introductionmentioning

confidence: 99%

Freeze-in Production of Pseudo-Nambu-Goldstone Dark Matter Model with a Real Scalar

Jiang¹,

Cai²,

Su³

et al. 2023

Preprint

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In this work, we study a pseudo-Nambu-Goldstone boson (pNGB) dark matter model extended with a real scalar. The dark sector is assumed to be feebly coupled with the standard model (SM) via a Higgs portal, so that the pNGB dark matter is produced by the freeze-in mechanism. Since the production happened in a very high energy era, we introduce an extra scalar field which is weakly coupled to the SM for stablizing the electroweak vacuum. Our model can reproduce the correct relic abundance of dark matter favored by observations. In addition, we determine the evolution of couplings in higher energy scale by solving the renormalization group equations, and show that the self coupling of the real scalar, λ S , and the mixing coupling between the Higgs field and the real scalar, λ HS are stringently constrained by the conditions of vacuum stability and couplings perturbativity up to the Planck scale. We also find that the relic abundance of DM is insensitive to the values of λ S and λ HS unless the dominant production processes are H + H(S + S) → φ + φ via t-and u-channels.

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Thermal production of cold “hot dark matter” around eV

Yin

2023

J. High Energ. Phys.

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A very simple production mechanism of feebly interacting dark matter (DM) that rarely annihilates is thermal production, which predicts the DM mass around eV. This has been widely known as the hot DM scenario. Despite there are several observational hints from background lights suggesting a DM in this mass range, the hot DM scenario has been considered strongly in tension with the structure formation of our Universe because the free-streaming length of the DM produced from thermal reactions was thought to be too long. In this paper, I show that the previous conclusions are not always true depending on the reaction for bosonic DM because of the Bose-enhanced reaction at very low momentum. By utilizing a simple 1 ↔ 2 decay/inverse decay process to produce DM, I demonstrate that eV range bosonic DM can be thermally produced in a cold manner from a hot plasma through a model-independent analysis applicable to axion, hidden photon, and other bosonic DM candidates. As a result, bosonic DM in the eV mass range may still be unique and theoretically well-motivated. I also discuss some caveats arising from this phenomenon in the freeze-in production of DM, and present a related system that can suppress the hot plasma with thermal reaction.

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Phenomenology of CP-even ALP

Cited by 11 publications

References 144 publications

Probing light dark sector at future lepton colliders via (dark) Higgs invisible decays

Probing light dark sector at future lepton colliders via (dark) Higgs invisible decays

Freeze-in Production of Pseudo-Nambu-Goldstone Dark Matter Model with a Real Scalar

Thermal production of cold “hot dark matter” around eV

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