WebMar 1, 2024 · The measured relic abundance sets an upper limit on the spinless photon mass of 500 GeV, which decreases to almost 200 GeV if the Higgs boson is light. ... neutralino-like dark matter of a mass of about 130 GeV giving rise to a 130 GeV photon line; ii) an annihilation cross section of or larger than 10{sup −27} cm{sup 3} s{sup −1}; iii) ... WebMay 27, 2015 · The dark photon candidate mass distribution has been scaled by 1 / 3. (d) Normalized residuals between the signal candidate distribution and the predicted …

Search for a heavy dark photon at future $e^+e^-$ colliders

WebThe mass range from 1.5 to 2.9 GeV is scanned for the dark photon candidate, and no significant signal is observed. The mass dependent upper limits at the 90% confidence level on the coupling strength parameter ϵ for a dark photon coupling with an ordinary photon vary between 1.6 ×10 -3 and 5.7 ×10 -3 . WebDark photon search in the mass range between 1.5 and 3.4 GeV/c Haddadi, Z.; Kalantar-Nayestanaki, N.; Kavatsyuk, M.; Löhner, H.; Messchendorp, J. G.; Tiemens, M.; BESIII … can carnivorous plants thrive in rich soil

Sub-GeV dark matter models and direct detection

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 interaction between this new field, potential new particle content (e.g., a See more • Dark radiation – Postulated type of radiation that mediates interactions of dark matter • Fifth force – Speculative fifth fundamental force 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 very weakly couple to the known forces of … See more Direct conversion A massive dark photon candidate with kinetic mixing strength $${\displaystyle \epsilon }$$ could spontaneously convert to a Standard Model See more WebFeb 4, 2024 · Centre Authors: Thomas, A. W., Williams, A. G., Wang, X. WebDark photons are particles invoked in some extensions of the Standard Model which could account for at least part of the dark matter content of the Universe. fishingperchwis