XENON collaboration

XENON collaboration
Name	XENON collaboration
Focus	Direct detection of dark matter
Founded	2005
Members	>150 scientists
Site	Gran Sasso
Detector	XENON1T, XENONnT

XENON collaboration

The XENON collaboration is an international experimental consortium focused on the direct detection of Dark matter using dual-phase liquid xenon time projection chambers. Founded by researchers from institutions such as Technische Universität München, Columbia University, NIKHEF, and University of Zurich, the collaboration operates deep underground at the Gran Sasso National Laboratory and interfaces with projects including LUX-ZEPLIN and PandaX. Its work intersects with theoretical frameworks from WIMP hypotheses, particle models from Supersymmetry, and astrophysical evidence from Planck and WMAP.

Overview

The collaboration deploys large-scale detectors such as XENON1T and XENONnT at Laboratori Nazionali del Gran Sasso to search for rare interactions predicted by WIMP models and alternative candidates informed by Axion and Sterile neutrino theories. Member institutions include universities and laboratories like Institute for Nuclear and Particle Physics (INPP), Université de Paris, Columbia University, University of Zurich, Stockholm University, University of Tokyo, INFN, and Lawrence Berkeley National Laboratory. The program complements parallel experiments including LUX-ZEPLIN, PandaX, DEAP-3600, and SuperCDMS, and contributes to broader initiatives tied to European Research Council funding and collaborations with projects under CERN auspices.

Detector Technology and Upgrades

Devices employ dual-phase Time projection chamber designs with liquid and gaseous xenon, photodetection via photomultiplier tubes or silicon photomultipliers, and cryogenic systems developed in partnership with groups from Brookhaven National Laboratory, Lawrence Livermore National Laboratory, and Rutherford Appleton Laboratory. Key detectors progressed from XENON10 through XENON100 to XENON1T and the upgraded XENONnT configuration, incorporating advances in High voltage delivery, Cryogenics engineering, Low-background techniques with materials screened at facilities like Gran Sasso Low Background Facility, and veto systems inspired by GERDA and Borexino designs. Upgrades have targeted Xe purification, Krypton reduction, radon mitigation, and scale-up of active mass comparable to design choices seen in DARWIN proposals.

Scientific Goals and Key Results

The primary objective is to achieve sensitivity to WIMP-nucleon cross sections predicted by Supersymmetry and effective field theory approaches, probing parameter space constrained by results from LHC searches, IceCube, and Fermi Gamma-ray Space Telescope observations. Notable results include world-leading limits on spin-independent WIMP cross sections from XENON1T runs, measurements of electronic recoil backgrounds relevant to Solar axion searches, and anomalous low-energy excesses prompting comparisons with Solar neutrino flux measurements from SNO and Super-Kamiokande. The collaboration has published constraints relevant to models motivated by Galactic center excess interpretations and has informed global fits combining Planck cosmological constraints with direct detection bounds.

Collaboration Structure and Institutions

Governance balances coordination among principal investigators at institutions such as ETH Zurich, Stockholm University, University of California, Berkeley, Columbia University, University of Mainz, INFN Gran Sasso, NIKHEF, and national laboratories including Brookhaven National Laboratory and Lawrence Berkeley National Laboratory. The collaboration organizes working groups for detector operations, data analysis, calibration, simulation, and outreach, with leadership elected from member institutions and steering committees interfacing with funding agencies like the European Research Council, U.S. Department of Energy, and national science foundations in Sweden, Italy, Germany, and Japan.

Data Analysis and Background Mitigation

Analysis pipelines incorporate techniques from Monte Carlo method simulations, calibration with sources such as 137Cs and 83mKr, and pulse-shape discrimination developed in part from experience at ZEPLIN-III and LUX. Background mitigation leverages material screening at SNOLAB-adjacent facilities, radon suppression strategies inspired by Borexino radiopurity campaigns, and krypton distillation technologies parallel to efforts at XENON100 and XENON1T. Statistical analyses use likelihood frameworks akin to methods employed by ATLAS and CMS for rare-event searches and employ blind-analysis protocols comparable to GERDA and CUORE.

Future Plans and Proposed Experiments

Future directions include full science runs of XENONnT, R&D toward multi-tonne detectors such as the DARWIN concept, and synergies with next-generation observatories like SKA for indirect constraints and Athena for complementary X-ray studies. Proposed initiatives involve expanded sensitivity to sub-GeV dark matter through electron recoil techniques, low-threshold sensor development with CERN and Lawrence Berkeley National Laboratory partners, and international coordination with LUX-ZEPLIN, PandaX-4T, and proposed facilities at SNOLAB to map the allowed parameter space suggested by Planck cosmology and Large Hadron Collider searches.

Category:Particle physics collaborations