Dark photon mass gev
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) ... WebIn 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.
Dark photon mass gev
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WebNov 1, 2024 · Dark photon search in the mass range between 1.5 and 3.4 GeV/c2 Full Record Cited by (9) Images (3) Related Research Abstract Using a data set of 2.93 fb -1 … WebJun 24, 2024 · We study the formation and evolution of vortices in U(1) dark photon dark matter and dark photon clouds that arise through black hole superradiance. We show how the production of both longitudinal mode and transverse mode dark photon dark matter can lead to the formation of vortices. After vortex formation, the energy stored in the dark …
WebMay 5, 2015 · Abstract. A sample of 1.69 × 10 7 fully reconstructed π 0 → γe + e – decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon (A') production in the π0→γA' decay followed by the prompt A' → e + e – decay. No signal is observed, and an exclusion region in the plane of the dark … Web2 Direct detection of sub-GeV dark matter8 2.1 Scattering rate9 2.2 Interaction strength10 2.3 Kinematics11 2.4 Direct detection with bound systems13 3 Electron excitations15 3.1 Atomic systems17 3.2 Solid state systems20 4 Phonon excitations23 4.1 Introduction to phonons24 4.2 Dynamic structure factor28 4.3 Dark photon couplings31 References 34
Webfa ≈1018 GeV. Our intent is to simply identify a part of parameter space where this model is self-consistent and achieves our desired goal. A broader analysis may reveal ... abundance, giving the dark photon a plasma mass in the early Universe. This plasma mass suppresses the cosmo-logical tachyonic instability, preserving axion dark matter. ... WebApr 1, 2024 · We derive a conservative lower-limit of the dark photon mass around 8.5 MeV from the current Planck data if the mixing between the dark photon and ordinary photon is larger than O (10 −9 ). We also find that the future CMB stage-IV experiments can probe up to 17 MeV dark photon. Download to read the full article text
WebIn section III, we discuss the production and decays of dark photon at e + e − colliders. In section IV, a detailed collider simulation with dark photon mass ranging from 20 GeV to …
WebNov 10, 2014 · A dark photon could be one of these emerging survivors, and it might identify itself through subsequent decay into standard model particles such as an electron and a positron (A ′ → e + e-). Even if the dark photon decay products are other dark sector particles, these could emerge from the dumps and have observable interactions in … northland bus service sault ste marieWebJan 1, 2016 · the Dark Photon below 1 GeV in the ... No signal is observed, and an exclusion region in the plane of the dark photon mass mA' and mixing parameter ε2 is established. The obtained upper limits on ... northland bus services calgaryWebJun 24, 2016 · In the low mass region, MS = (53{62:8) GeV, the main contribution to nal state radiation comes from the annihilation into two b-quarks and a photon, while in the heavy mass region the annihilation into two W gauge bosons and a photon is the dominant contribution. These results are very important to understand the visibility of the gamma … how to say nurse in sign languageWebApr 20, 2024 · We 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 \( B\overline{B} \) events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4S) resonance.No signal is found in the dark … how to say nuts in latinWebPseudoscalars appear frequently in particle spectra. They can be light if they appear as pseudo-Goldstone bosons from some spontaneously broken global symmetries with the decay constant f. Since any global symmetry is broken at least by quantum gravitational effects, all pseudoscalars are massive. The mass scale of a pseudoscalar is determined … how to say nutramigenWebMay 11, 2024 · We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/$c^{2}$ and set a 90% confidence level upper limit on the mixing strength of the … how to say nut in germanWebMay 7, 2024 · Abstract: We search for the dark photon cold dark matter (DP-CDM) using a cryogenic millimeter-wave receiver. DP-CDM weakly couples to electromagnetic fields … how to say nuts in french