The first results of PandaX-4T

2022 ◽  
Author(s):  
Jianglai Liu
Keyword(s):  
Dark Matter ◽  
Data Analysis ◽  
Liquid Xenon ◽  
Observable Universe ◽  
Fundamental Particle ◽  
Search Results ◽  
Visible Matter ◽  
First Results ◽  
New Type ◽  
Deep Underground

Dark matter, an invisible substance which constitutes 85% of the matter in the observable universe, is one of the greatest puzzles in physics and astronomy today. Dark matter can be made of a new type of fundamental particle, not yet observed due to its feeble interactions with visible matter. In this talk, we present the first results of PandaX-4T, a 4-ton-scale liquid xenon dark matter observatory, searching for these dark matter particles from deep underground. We will briefly summarize the performance of PandaX-4T, introduces details in the data analysis, and present the latest search results on dark matter-nucleon interactions.

scholarly journals First Model Independent Results from DAMA/LIBRA–Phase2

Universe ◽  
2018 ◽  
Vol 4 (11) ◽  
pp. 116 ◽  
Author(s):  
Rita Bernabei ◽  
Pierluigi Belli ◽  
Andrea Bussolotti ◽  
Fabio Cappella ◽  
Vincenzo Caracciolo ◽  
...  
Keyword(s):  
Dark Matter ◽  
Quantum Efficiency ◽  
Energy Region ◽  
National Laboratory ◽  
High Quantum Efficiency ◽  
Annual Cycles ◽  
Experimental Configuration ◽  
First Results ◽  
Deep Underground ◽  
Model Independent

The first results obtained by the DAMA/LIBRA–phase2 experiment are presented. The data have been collected over six independent annual cycles corresponding to a total exposure of 1.13 ton × year, deep underground at the Gran Sasso National Laboratory. The DAMA/LIBRA–phase2 apparatus, about 250 kg highly radio-pure NaI(Tl), profits from a second generation high quantum efficiency photomultipliers and of new electronics with respect to DAMA/LIBRA–phase1. The improved experimental configuration has also allowed to lower the software energy threshold. The DAMA/LIBRA–phase2 data confirm the evidence of a signal that meets all the requirements of the model independent Dark Matter annual modulation signature, at 9.5 σ C.L. in the energy region (1–6) keV. In the energy region between 2 and 6 keV, where data are also available from DAMA/NaI and DAMA/LIBRA–phase1, the achieved C.L. for the full exposure (2.46 ton × year) is 12.9 σ .

PandaX: A deep underground dark matter search experiment in China using liquid xenon

2018 ◽  
Vol 33 (30) ◽  
pp. 1830013 ◽  
Author(s):  
Li Zhao ◽  
Jianglai Liu
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Underground Laboratory ◽  
Liquid Xenon ◽  
Detection Experiment ◽  
Dark Matter Search ◽  
The Future ◽  
Search Experiment ◽  
Deep Underground ◽  
Scientific Results

The nature of dark matter is one of the most fundamental scientific unknowns. Particle physicists have spent decades searching for evidence of dark matter particles. The PandaX project is a staged xenon-based dark matter direct detection experiment located at the China Jinping Underground Laboratory. In this paper, we give an overview of the PandaX experiment, discuss its recent scientific results, and outline the plan for the future.

scholarly journals First dark matter search results from a 4-kgCF3Ibubble chamber operated in a deep underground site

2012 ◽  
Vol 86 (5) ◽  
Author(s):  
E. Behnke ◽  
J. Behnke ◽  
S. J. Brice ◽  
D. Broemmelsiek ◽  
J. I. Collar ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Search ◽  
Search Results ◽  
Deep Underground

Erratum: First dark matter search results from a 4-kgCF3Ibubble chamber operated in a deep underground site [Phys. Rev. D86, 052001 (2012)]

2014 ◽  
Vol 90 (7) ◽  
Author(s):  
E. Behnke ◽  
J. Behnke ◽  
S. J. Brice ◽  
D. Broemmelsiek ◽  
J. I. Collar ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Search ◽  
Search Results ◽  
Deep Underground

scholarly journals A Review of Basic Energy Reconstruction Techniques in Liquid Xenon and Argon Detectors for Dark Matter and Neutrino Physics Using NEST

Instruments ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 13
Author(s):  
Matthew Szydagis ◽  
Grant A. Block ◽  
Collin Farquhar ◽  
Alexander J. Flesher ◽  
Ekaterina S. Kozlova ◽  
...  
Keyword(s):  
Dark Matter ◽  
Neutrino Physics ◽  
Electric Fields ◽  
Direct Detection ◽  
Profile Likelihood ◽  
Liquid Argon ◽  
Energy Scale ◽  
Liquid Xenon ◽  
Nuclear Recoils ◽  
Available Information

Detectors based upon the noble elements, especially liquid xenon as well as liquid argon, as both single- and dual-phase types, require reconstruction of the energies of interacting particles, both in the field of direct detection of dark matter (weakly interacting massive particles WIMPs, axions, etc.) and in neutrino physics. Experimentalists, as well as theorists who reanalyze/reinterpret experimental data, have used a few different techniques over the past few decades. In this paper, we review techniques based on solely the primary scintillation channel, the ionization or secondary channel available at non-zero drift electric fields, and combined techniques that include a simple linear combination and weighted averages, with a brief discussion of the application of profile likelihood, maximum likelihood, and machine learning. Comparing results for electron recoils (beta and gamma interactions) and nuclear recoils (primarily from neutrons) from the Noble Element Simulation Technique (NEST) simulation to available data, we confirm that combining all available information generates higher-precision means, lower widths (energy resolution), and more symmetric shapes (approximately Gaussian) especially at keV-scale energies, with the symmetry even greater when thresholding is addressed. Near thresholds, bias from upward fluctuations matters. For MeV-GeV scales, if only one channel is utilized, an ionization-only-based energy scale outperforms scintillation; channel combination remains beneficial. We discuss here what major collaborations use.

scholarly journals Antimatter cosmic rays from dark matter annihilation: First results from an N-body experiment

2008 ◽  
Vol 78 (10) ◽  
Author(s):  
J. Lavalle ◽  
E. Nezri ◽  
E. Athanassoula ◽  
F.-S. Ling ◽  
R. Teyssier
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
Dark Matter Annihilation ◽  
First Results

THE ALICE EXPERIMENT AT CERN LHC: STATUS AND FIRST RESULTS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 517-522
Author(s):  
◽  
ERMANNO VERCELLIN
Keyword(s):  
Data Analysis ◽  
Cosmic Rays ◽  
Dense Matter ◽  
Heavy Ion ◽  
Short Description ◽  
Alice Experiment ◽  
Ion Collisions ◽  
Physics Program ◽  
Accelerate Proton ◽  
First Results

The ALICE experiment is aimed at studying the properties of the hot and dense matter produced in heavy-ion collisions at LHC energies. In the first years of LHC operation the ALICE physics program will be focused on Pb - Pb and p - p collisions. The latter, on top of their intrinsic interest, will provide the necessary baseline for heavy-ion data. After its installation and a long commissioning with cosmic rays, in late fall 2009 ALICE participated (very successfully) in the first LHC run, by collecting data in p - p collisions at c.m. energy 900 GeV. After a short stop during winter, LHC operations have been resumed; the machine is now able to accelerate proton beams up to 3.5 TeV and ALICE has undertaken the data taking campaign at 7 TeV c.m. energy. After an overview of the ALICE physics goals and a short description of the detector layout, the ALICE performance in p - p collisions will be presented. The main physics results achieved so far will be highlighted as well as the main aspects of the ongoing data analysis.

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