Dark photon branch ratio
Webis the mass of the dark photon. If there is a light Higgs boson accom-panied with the dark photon, the sensitivity of XENON10 experiment is κ×e′ < 10−13, which is still second to the constraints from the lifetime of horizontal branch starts which dictates κ× e′ < 3× 10−14. PRESENTED AT CosPA 2013 Symposium 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 …
Dark photon branch ratio
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WebThe dark photon sees ordinary matter only through the e ect of operators 4 like the magnetic moment or the charge form factors (of dimension higher than four). This is the choice de ning the massless dark photon proper: L0= e0J0 A 0 + e0" p 1 "2 J0 + e p 1 "2 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.
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 … 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.
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... http://www.le.infn.it/~chiodini/allow_listing/padme/docs/darkphoton2005.01515.pdf
Webto SM photon would occur through loops of heavy dark particles, charged under both electroweak and dark inter-actions, giving rise to a very weak mixing strength defined as the ratio of dark and fine structure coupling constants (ε2 =α/α<10−2). Moreover, the dark photon (re-ferred to also as U, A or γ) should get mass by means of
The 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 how many miles long is tokyohow are site and situation relatedWebWe present a search for the dark photon A′ in the B 0 → A′A′ decays, where A′ subsequently decays to e + e −, μ + μ −, and π + π −.The search is performed by analyzing 772 × 10 6 BB¯ events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4S) resonance. [Figure not available: see fulltext.] how many miles new tiresWebwhen the dark photon decays to e+e ; (2) D and 4He over-production stemming from an increase in the n=p-ratio when the dark photon decays to ˇ+ˇ or K+K prior to NSE-freezeout, T>100keV; and (3) D over-production from an injection of neutrons facilitated by dark photon decay. Comparing the calculated yields of D, 3He, and 4He with the precision how are skates sharpenedWebMay 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, … how are sith names chosenWebIn a fixed target experiment dark photons can be generated by bremsstrahlung of scattering protons, in analogy with the ordinary photon bremmstrahlung. Consider a protonbeamwithinitialmomentumandenergy P andE prespectively. LetE 0andp betheenergyandmomentumofthegenerateddarkphoton. how are single wide mobile homes builtWebOct 1, 2013 · Finally, for a finite size thermal system, the radiation power into the dark photons can be written as (27) P = ∫ d V ∫ d ω ( κ T 2 ω d Γ T prod d ω d V + κ L 2 ω d Γ L prod d ω d V). In the next section, we use (27) to calculate the V -emission rate as a function of m V. 4. Solar luminosity and horizontal branch stars constraints on dark vectors how are skates and rays different