Atmospheric neutrinos in a next-generation xenon dark matter experiment

Atmospheric Dark Matter and Xenon1T Excess

Very recently, the Xenon1T collaboration has reported an intriguing electron recoil excess, which may imply for light dark matter. In order to interpret this anomaly, we propose the atmospheric dark matter (ADM) from the inelastic collision of cosmic rays (CRs) with the atmosphere. Due to the boost effect of high energy CRs, we show that the light ADM can be fast-moving and successfully fit the observed electron recoil spectrum through the ADM-electron scattering process. Meanwhile, our ADM predicts the scattering cross section $σ_e \sim {\cal O}(10^{-38}- 10^{-39}$) cm$^{2}$, and thus can eva…

Higgs searches and singlet scalar dark matter: Combined constraints from XENON 100 and the LHC

XENON100 and the LHC are two of the most promising machines to test the physics beyond the Standard Model. In the meantime, indirect hints push us to believe that the dark matter and Higgs boson could be the two next fundamental particles to be discovered. Whereas ATLAS and CMS have just released their new limits on the Higgs searches, XENON100 obtained very recently strong constraints on DM-proton elastic scattering. In this work, we show that when we combined WMAP and the most recent results of XENON100, the invisible width of the Higgs to scalar dark matter is negligible($\lesssim 10%$), ex…

On the spin-dependent sensitivity of XENON100

The latest XENON100 data severely constrains dark matter elastic scattering off nuclei, leading to impressive upper limits on the spin-independent cross-section. The main goal of this paper is to stress that the same data set has also an excellent \emph{spin-dependent} sensitivity, which is of utmost importance in probing dark matter models. We show in particular that the constraints set by XENON100 on the spin-dependent neutron cross-section are by far the best at present, whereas the corresponding spin-dependent proton limits lag behind other direct detection results. The effect of nuclear u…

Baryogenesis, dark matter and inflation in the Next-to-Minimal Supersymmetric Standard Model

Explaining baryon asymmetry, dark matter and inflation are important elements of a successful theory that extends beyond the Standard Model of particle physics. In this paper we explore these issues within the Next-to-Minimal Supersymmetric Standard Model (NMSSM), by studying the conditions for a strongly first order electroweak phase transition, the abundance of the lightest supersymmetric particle (LSP), and inflation driven by a gauge invariant flat direction of MSSM made up of right handed squarks. We present the regions of parameter space which can yield successful predictions for cosmic …

Direct Dark Matter search with the XENON program

We present the most recent results from XENON100, the current phase of the XENON dark matter search program. XENON100 is a dual phase time-projection chamber operated at the Laboratori Nazionali del Gran Sasso (LNGS) whose ultra-low electromagnetic background, about 5 x 10^-3 events/(kg x day x keV), allowed to set the most stringent limit to date, excluding WIMP-nucleon spin-independent interaction down to cross-sections of 2 x 10^-45 cm^2 for a 55 GeV/c^2 mass at 90% confidence level and 3.5 x10^-40 for 45 GeV/c^2 in the spin-dependent interaction with neutrons. We also introduce the status …

PandaX-xT：中国锦屏地下实验室的一个数十吨级液氙天文台

PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory

本文提出将PandaX-4T升级为43吨活性靶的PandaX-xT超低背景液氙天文台，以大幅提升暗物质、无中微子双β衰变及稀有中微子过程的探测灵敏度。