Searching for axino-like particle at fixed target experiments

Abstract

We investigate the detectability of axino-like particle, which is defined as a supersymmetric partner of axion-like particle and can be a good candidate for dark matter in our Universe. Especially, we consider the fixed target experiments to search for the light axino-like particle with a neutralino as the next-to-lightest supersymmetric particle. We calculate the production and decay rate of neutralinos and the consequent number of events (such as photons and charged leptons) that are produced when the neutralinos decay to the axino-like particles.

Dark scalars and heavy neutral leptons at DarkQuest

“…Looking down the road, a potential Phase II scenario with 10 20 protons on target and a 7m-12m fiducial decay region would allow for improvements by more than one order of magnitude in terms of the interaction rates with SM particles (proportional to squared mixing angle). Our results build on past phenomenological studies [9][10][11][12][13][14][15] and provide further motivation for the DarkQuest ECAL upgrade. This upgrade can be realized with a relatively modest investment and will leverage the existing experimental infrastructure already in place to build an exciting dark sector physics program at Fermilab.…”

“…As we will demonstrate, DarkQuest has excellent prospects to explore substantial new regions of parameter space in these scenarios. Along with previous studies targeting a variety of dark sector models [9][10][11][12][13][14][15], our results lend further strong motivation for the DarkQuest ECAL upgrade, which will provide the basis for a rich and exciting experimental search program in the coming 5-10 years.…”

“…The proposed DarkQuest upgrade entails the addition of an electromagnetic calorimeter (ECAL) to the existing SeaQuest muon spectrometer, which will extend the physics capabilities of the experiment. These new capabilities will allow for DarkQuest to produce a suite of sensitive searches for dark particles decaying to a wide variety of SM final states such as electrons, muons, charged hadrons, and photons [9][10][11][12][13][14][15]. The experiment's high luminosity coupled with its short baseline would allow for sensitivity to both fairly short-lived particles (cτ 1 m) and more weakly-coupled particles with fairly low production rates.…”

Light dark sectors through the Fermion portal

“…For K 0 S , K − and K + we find that the multiplicities of 0.232, 0.224 and 0.331, respectively, from ref. [52] agree well with our EPOS simulations for proton-proton collisions at √ s = 27.4 GeV. However, the target for SHiP is tungsten where we find instead a factor of ∼ 2.5 enhancement in multiplicities.…”

Superheavy WIMP dark matter from incomplete thermalization

“…In Ref. [11], this mechanism has been applied to axino-like particle, fermionic superpartner of ALPs called "ALPino", dark matter with a small ALPs decay constant as the weak scale. In the following, we will show that a suitable value of the reheating temperature T R ≃ m DM /29 can reproduce the observed relic abundance for a superheavy WIMP DM.…”