Dark photon mass gev

Author: cvac

August undefined, 2024

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. ... WebDec 25, 2024 · Abstract: A coupling of a dark photon $A'$ from a $U(1)_{A'}$ with the standard model (SM) particles can be generated through kinetic mixing represented by a parameter $\epsilon$. A non-zero $\epsilon$ also induces a mixing between $A'$ and $Z$ if dark photon mass $m_{A'}$ is not zero.

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

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. WebDark Photon Searches with ATLAS 2. Dark Boson Models. •Vector Portal: Add a U(1)’ whose massive “dark” gauge boson (A’ / Z. D/ γ. d. ) mixes kinetically with SM photon •+ Higgs Portal: Add dark scalar singlet (φ/ S) that spontaneously breaks U(1)’ and mixes with SM Higgs •Hidden Valley: sector of dark particles, interacting ... raymond tomlinson attorney

PAPER OPEN ACCESS Production and constraints for a …

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 WebDec 2, 2024 · The Heavy Photon Search Group at SLAC is collaborating with physicists at Jefferson Lab, INFN, IN2P3, UNH and UCSC in an experiment aimed at discovering a hidden-sector photon (aka "dark" photon or "heavy" photon). Such a particle could have mass in the range 0.01 to 0.5 GeV, couple weakly to electrons, and decay to e + e -. WebMay 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 … raymond toms solicitor

Prospective study of light dark matter search with a …

Dark Photons Review - Berkeley Lab Physics Division (Indico)

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 … WebDark Photon is justiﬁed in the simple Higgs structure “SM Higgs doublet + Higgs singlet” (Higgs singlet to break U(1)’ and give a mass to Z’) Z-Z’ kinetic mixing part is cancelled by Z-Z’ mass mixing (which is “induced by kinetic mixing”) at … raymond toneWebDark photon limits Data, plots and code for constraints on axions, axion-like particles, and dark photons ... Tests of coulomb law/photon mass. Atomic spectroscopy: limit, reference; AFM limit, reference; ... They also … simplify complex numbers addition

"Web2 days ago · Center: Binned number of events in a Ge target with a kg-yr exposure, assuming a DM mass of GeV and a heavy mediator. ... Projected constraints on the dark matter interaction cross section in the dark photon mediator model from a few anisotropic crystal targets. Solid curves are the 95% C.L. constraints (3 events), and dashed curves … " - Dark photon mass gev

Dark photon mass gev

PAPER OPEN ACCESS Production and constraints for a …

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 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 …

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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 … WebDec 1, 2024 · Dark Matter 27. Dark Matter RevisedAugust2024byL.Baudis(ZurichU.)andS.Profumo(UCSantaCruz). ... the existence of DM is inferred directly using tracers of mass enclosed within a certain radius such as stellar velocity dispersion, rotation curves in axisymmetric systems, the virial theorem, ... DM/1 …

WebFeb 4, 2024 · Centre Authors: Thomas, A. W., Williams, A. G., Wang, X. WebDec 25, 2024 · A coupling of a dark photon from a with the standard model (SM) particles can be generated through kinetic mixing represented by a parameter . A non-zero also induces a mixing between and if dark photon mass is not zero. This mixing can be large when is close to even if the parameter is small.

WebJul 16, 2024 · For models of scalar and fermionic light thermal dark matter production via dark photon, we present the constrains on the dimensionless dark matter parameter as function of the DM mass at BESIII and future STCF, conventionally assuming the dark coupling constant and . WebThe Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab(-1) over ten years of operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson …

WebJan 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 ...

WebApr 25, 2024 · In the previous study, it was assumed that the dark photon has a Stückelberg mass, or a mass generated by the Higgs mechanism with a sufficiently heavy Higgs boson. In this paper we consider a case in which the Higgs boson is not fully decoupled; the Higgs field changes its vacuum expectation value after inflation. simplify compound fractional expressionWebNov 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 … simplify compliance blrWebNov 1, 2024 · Dark Photon parameters: coupling and mass. To introduce the fundamental parameters for the description of a dark photon, the coupling and its mass, let us … simplify compound fraction calculatorWebMay 7, 2024 · Dark Photon and Muon g-2 Inspired Inelastic Dark Matter Models at the High-Energy Intensity Frontier Phys Rev Lett. 2024 May 7;126 (18):181801. doi: … simplify complex number expressionsWebApr 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 … simplify complexity incWebFeb 1, 2024 · Production of dark photon and dark scalar mediator In this section, we investigate the production of the massive dark photon and of the massive dark scalar mediator via the processes and ( and b) at the center-of-mass energies 91.2 GeV, 240 GeV, 500 GeV and 1 TeV, with different values of and . simplify conditional ternary expressionWebspace of the dark photon for masses below 10 GeV. By refitting the DIS data in this way, we place upper limits on the mixing parameter of the dark photon for masses up to 80 … simplify complex number fractions