Dark photon branch ratio
WebdarkE photoncos( ) c)+2E m = m2 e c 2 (10) Now, we can simplify this equation by adding m2 e c 2 to both sides, and grouping like terms. Doing so gives us: m2 darkc 2 2(m eE … WebSep 20, 2024 · As conventional dark matter scenarios have been probed extensively so far, the physics of a light dark matter charged under a new gauge group (dark gauge group) becomes one of new research...
Dark photon branch ratio
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WebFeb 6, 2024 · A record low dark current of 51.1 fA (51.1 pA cm −2) and a noise current of 152 fA are experimentally demonstrated, the ratio of sensitivity/dark current … WebApr 1, 2024 · Abstract We consider a generic dark photon that arises from a hidden U (1) gauge symmetry imposed on right-handed neutrinos ( νR ν R ). Such a νR ν R -philic dark photon is naturally dark due to the absence of tree-level couplings to normal matter.
WebApr 1, 2024 · Dark matter particles that annihilate into neutrinos will also inevitably branch into electromagnetic final states through higher-order tree and loop diagrams that give … WebAs a point of reference, the minimum detection limit of the dark-adapted eye is approximately 40 times that (40 million photons/second). A properly designed fluorescence microscope typically yields 10e8 to 10e9 photons per second from the focal volume, or 100 to 1000 photons/pixel/second with the same 1-megapixel sensor.
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WebApr 11, 2024 · dark photon. In this paper, we study experimental and theoretical constraints on an extensive set of mediator models. We show that these constraints limit the Higgs branching ratio to a photon and a dark photon to be far smaller than the current sensitivity of collider searches. I. INTRODUCTION The dark photon is a hypothetical Abelian …
WebMay 4, 2024 · We explain how the dark photon enters laboratory, astrophysical and cosmological observations as well as dark matter physics. We survey the current and … csecho aortaWebS~, with gyromagnetic ratio g µ = 2. Quantum loop effects lead to a small calculable deviation from g µ = 2, parameterized by the anomalous magnetic moment a µ ≡ g µ −2 2. (1) That quantity can be accurately measured and, within the Standard Model (SM) framework, precisely predicted. Hence, comparison of experiment and theory tests the ... cse-chrysoWebThe baryon–photon ratio, η, is the key parameter determining the abundances of light elements after nucleosynthesis ends. Baryons and light elements can fuse in the … cs echo dukeWebThe branching ratio of the dark photon A into different final states of interest as a function of mass M A : A → e + e − (purple), µ + µ − (green), and hadronic final states (orange). Adapted... csec history paper 2 2020WebAug 17, 2016 · The ratio of baryons to photons or the baryon abundance is defined as: n ≡ N b N γ ≃ 2.75 × 10 − 8 Ω b h 2 where N b is the number density of baryons, and N γ = 4.11 × 10 8 m − 3 is the number density of photons. Thus the primordial abundances of baryonic matter in the standard Big Bang nucleosynthesis scenario (BBN) is proportional to Ω b h 2. csec history paper 1 2018WebOct 24, 2024 · In this second run of the experiment, we measured the radiative decay branching ratio in the energy range of 14 keV to 782 keV with a total uncertainty of 5 % (12-element bismuth germanate detector) and in the energy range from 0.4 keV to 14 keV with a total uncertainty of 11 % (bare photodiode detector). csechubhttp://insti.physics.sunysb.edu/~curtin/hahm_mg.html dyson repairs west sussex