Limits on Axion Couplings from the First 80 Days of Data of the PandaX-II Experiment

Abstract

We report new searches for solar axions and galactic axionlike dark matter particles, using the first low-background data from the PandaX-II experiment at China Jinping Underground Laboratory, corresponding to a total exposure of about 2.7×10^{4} kg day. No solar axion or galactic axionlike dark matter particle candidate has been identified. The upper limit on the axion-electron coupling (g_{Ae}) from the solar flux is found to be about 4.35×10^{-12} in the mass range from 10^{-5} to 1 keV/c^{2} with 90% confidence level, similar to the recent LUX result. We also report a new best limit from the ^{57}Fe deexcitation. On the other hand, the upper limit from the galactic axions is on the order of 10^{-13} in the mass range from 1 to 10 keV/c^{2} with 90% confidence level, slightly improved compared with the LUX.

Search for Axionlike Dark Matter with a Liquid-State Nuclear Spin Comagnetometer

“…The large parameter space of axion has motivated many experimental searches based on three possible types of non-gravitational interactions (couplings) between axions and standard model particles: the axion-photon coupling, which can interconvert axions and photons in a magnetic field [12]; the axion-gluon coupling, which can generate oscillating electric dipole moments (EDMs) in nuclei, atoms, and molecules [13][14][15][16]; the axion-fermion (wind) coupling, which can induce spin-dependent en-ergy shifts and spin precession in fermions [16][17][18][19][20]. The axion-photon coupling has been searched for in numerous experiments, many of which give constraints for axions with masses heavier than 10 −6 eV [21][22][23][24][25][26][27]. An opticalcavity experiment was proposed to search for axions with masses of 10 −17 eV and up to 10 −10 eV [28].…”

A search for solar axion induced signals with COSINE-100

“…For the DFSZ model, we use cos 2 β = 1 to include most variants of the two models. These are the same choice as the recent experimen- tal interpretations [41,42,43,44,45,46]. QCD axions heavier than 0.59 eV/c 2 in the DFSZ model and 168.1 eV/c 2 in the KSVZ model are excluded using the parameter described above.…”

“…There is no excess of events that could be attributed to solar axion interactions and this translates into an axion-electron coupling limit g ae < 1.70 × 10 −11 Figure 8: (Color online) The observed 90% CL exclusion limits (red line) on the axion-electron coupling (g ae ) for the first 59.5 days data of COSINE-100 are shown together with the 68% and 95% probability bands for the expected 90% CL limit assuming the backgroundonly hypothesis. The limits are compared with the results set by XMASS [41], EDELWEISS-III [42], KIMS [43], XENON100 [44], PandaX-II [45], and LUX [46] experiments together with indirect astrophysical bounds of solar neutrino [47]. The inclined lines show two benchmark models of the DFSZ (cos 2 β = 1) and KSVZ. for axion masses in the 0-1 keV/c 2 range.…”

Constraints on bosonic dark matter with low threshold germanium detector at Kuo-Sheng reactor neutrino laboratory

“…The signal of nonrelativistic χ would be δ-function centered at its mass, CoGeNT [24], EDELWEISS [25], LUX [26], Majorana Demonstrator [27], PANDAX-II [28], XENON100 [29] along with indirect astrophysical bound from solar neutrinos [30] are also shown.…”