Showing papers by "Pengwei Xie published in 2018"
TL;DR: The results are applied to constrain self-interacting dark matter models with a light mediator mixing with standard model particles, and set strong limits on the model parameter space for the dark matter mass ranging from 5 GeV to 10 TeV.
Abstract: We search for nuclear recoil signals of dark matter models with a light mediator in PandaX-II, a direct detection experiment in the China Jinping underground laboratory. Using data collected in 2016 and 2017 runs, corresponding to a total exposure of 54 ton day, we set upper limits on the zero-momentum dark matter-nucleon cross section. These limits have a strong dependence on the mediator mass when it is comparable to or below the typical momentum transfer. We apply our results to constrain self-interacting dark matter models with a light mediator mixing with standard model particles, and set strong limits on the model parameter space for the dark matter mass ranging from 5 GeV to 10 TeV.
86 citations
TL;DR: In this article, a simulation study of the expected background in PandaX-4T was presented, where the authors found that the expected nuclear recoil background is 4.9x10-5 /(kg day keV).
Abstract: The PandaX-4T experiment, a four-ton scale dark matter direct detection experiment, is being planned at the China Jinping Underground Laboratory. In this paper we present a simulation study of the expected background in this experiment. In a 2.8-ton fiducial mass and the signal region between 1 to 10 keV electron equivalent energy, the total electron recoil background is found to be 4.9x10^{-5} /(kg day keV). The nuclear recoil background in the same region is 2.8x10^{-7}/(kg day keV). With an exposure of 5.6 ton-years, the sensitivity of PandaX-4T could reach a minimum spin-independent dark matter-nucleon cross section of 6x10^{-48} cm^{2} at a dark matter mass of 40 GeV/c^{2}.
67 citations
Posted Content•
05 Jul 2018
TL;DR: In this paper, Wang et al. presented constraints on the WIMP-nucleon effective interaction from the PandaX-II experiment, and obtained the most stringent upper limits on spin-dependent WIMPs-Nucleon cross section of $9.0\times 10^{-42}$cm$^2$ for neutron-only coupling with mass of 40 GeV/$c^2
Abstract: We present constraints on the WIMP-nucleon effective interaction from the PandaX-II experiment. We consider well-motivated dimensional-four interactions consisting of couplings among vector and axial vector currents, as well as several typical dimension-five and dimension-six operators in effective field theory. The data set corresponding to a total exposure of 54-ton-day is reanalyzed, and limits on the effective couplings have been obtained as a function of the WIMP mass, both in isoscalar and isovector channels. We obtain the most stringent upper limits on spin-dependent WIMP-nucleon cross section of $9.0\times 10^{-42}$cm$^2$ for neutron-only coupling with mass of 40 GeV/$c^2$ at 90% confidence level. Similarly, the minimum constraint on WIMP-proton cross section is $2.2 \times 10^{-38}$cm$^2$.
7 citations
Posted Content•
19 Feb 2018
TL;DR: In this paper, the authors present a particle-physics study on SIDM models in PandaX-II, a direct detection experiment in China JinPing underground Laboratory, corresponding to a total exposure of 54 ton day, the largest published data set of its kind.
Abstract: Self-Interacting Dark Matter (SIDM) is a leading candidate to solve the puzzles of the cold dark matter paradigm on galactic scales. We present a particle-physics study on SIDM models in PandaX-II, a direct detection experiment in China JinPing underground Laboratory. We use data collected in 2016 and 2017 runs, corresponding to a total exposure of 54 ton day, the largest published data set of its kind to date. Strong combined limits are set on the mass of the dark-force mediator, its mixing with the standard model particles, and the mass of dark matter. Together with considerations from the Big-Bang Nucleosynthesis, our results put tight constraints on SIDM models.
3 citations