Dark photon branch ratio
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 … WebSong Mao. Li Gang. Guo Jian-You. In this paper, we introduce the spinor helicity amplitude method. We provide the approaches to handle with massless fermions, massive spinors and polarization ...
Dark photon branch ratio
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WebThe 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 … WebDec 10, 2011 · The ratio of the probabilities of the two decays is proportional to the bottom quark mass, divided by the electron mass, squared (and then multiplied by 3, because of the properties of the strong nuclear force), giving 3 (m bottom / m electron) 2 = 200,000,000 or so That’s a big number!
WebMay 23, 2024 · We find that the branching ratio of the Higgs boson to a photon and a dark photon is constrained to be far smaller than the sensitivity of current collider searches, … 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 …
Webdark photon lighter than ∼20 GeV and regardless how the dark photon is produced. In Sec. IVB, we will explore the possibility of producing the dark photon from the mono … Web• Interpretation depends on a number of assumptions – Light hidden fermion in addition to the dark photon – Higgs decay branching ratio 21 Current hidden photon limits at the LHC Remember : ATLAS limit relies on more assumptions ATLAS ArXiv:1511.05542 (2015), CMS arXiv:1506.00424 (2015) 22 LHCb
WebFeb 1, 2024 · Ipair numerically equals the branching ratio related to the internal pair production or the internal pair production intensity; • Q511 is the number of 511 keV …
WebS~, 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 ... profilbrochureThe experiment has excluded dark photon candidates with mass centered around 24.86 μeV and by using a superconducting qubit to repeatedly measure the same photon. This has enabled a search speed up of over 1,000 as compared to the conventional linear amplification technique. See more The dark photon (also hidden, heavy, para-, or secluded photon) is a hypothetical hidden sector particle, proposed as a force carrier similar to the photon of electromagnetism but potentially connected to See more Adding a sector containing dark photons to the Lagrangian of the Standard Model can be done in a straightforward and minimal way by introducing a new U(1) gauge field. The specifics of the … See more • Dark radiation – Postulated type of radiation that mediates interactions of dark matter • Fifth force – Speculative fifth fundamental force • Dual photon – Hypothetical particle dual to the photon See more Observations of gravitational effects that cannot be explained by visible matter alone imply the existence of matter which does not or does only … See more Direct conversion A massive dark photon candidate with kinetic mixing strength $${\displaystyle \epsilon }$$ could spontaneously convert to a Standard Model photon. A cavity, with resonant frequency tuned to match the mass of a dark … See more profil bts ndrcWebAug 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. profil bright vachirawitWebAbstract: Searches for dark photons provide serendipitous discovery potential for other types of vector particles. We develop a framework for recasting dark photon searches to … profil bts samWebdark photon decays. The keys to improving sensitivity include increasing the luminosity and improvingthemassresolution(whichwoulddecreasetheeffectivebackgroundyields),bothof … profil buchhandlungWebApr 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 … remington m40a5WebBecause the dark current pulses are usually distributed in the lower pulse height region, setting the LLD level in the vicinity of the valley (L 1 ) of the distribution can effectively … profil buchhalter