Publications by authors named "Yunyang Luo"
Article Synopsis
- The PandaX-4T detector at the China Jinping Underground Laboratory detects solar ^{8}B neutrinos through coherent scattering with liquid xenon nuclei, focusing on specific energy thresholds for data selection.
- The experiment analyzed data from both commissioning and initial science runs, observing a total of 3 paired events and 332 unpaired ionization signals, with background events estimated at 2.8±0.5 and 251±32, respectively.
- The results indicate a solar ^{8}B neutrino flux of (8.4±3.1)×10^{6} cm^{-2} s^{-1}, aligning with standard solar model predictions, and providing the first signs of solar neutr
Article Synopsis
- - The study discusses the first search for elastic scattering between low-mass dark matter particles (sub-MeV) and electrons, conducted using the PandaX-4T liquid xenon experiment.
- - These sub-MeV dark matter particles can gain energy through interactions with cosmic-ray electrons, which could be spotted as electron recoil signals in the experiment.
- - With an exposure of 0.63 tonne·year, the researchers established new limits on the interaction strength between dark matter and electrons across a range of masses from 10 eV/c² to 3 keV/c².
^{134}Xe is a candidate isotope for neutrinoless double beta decay (0νββ) search. In addition, the two-neutrino case (2νββ) allowed by the standard model of particle physics has not yet been observed. With the 656-kg natural xenon in the fiducial volume of the PandaX-4T detector, which contains 10.
View Article and Find Full Text PDFArticle Synopsis
- This study presents findings from the PandaX-4T experiment, focusing on detecting interactions between dark matter and nucleons through a dark mediator.
- By analyzing low-energy ionization signal data and applying the Migdal effect, the researchers establish the most stringent limits on the cross section for dark matter masses between 30 MeV/c² and 2 GeV/c².
- The research also challenges a model where a dark photon decays into scalar dark matter pairs, significantly limiting the possible parameters for this thermal relic dark matter scenario.
We report a search for light dark matter produced through the cascading decay of η mesons, which are created as a result of inelastic collisions between cosmic rays and Earth's atmosphere. We introduce a new and general framework, publicly accessible, designed to address boosted dark matter specifically, with which a full and dedicated simulation including both elastic and quasielastic processes of Earth attenuation effect on the dark matter particles arriving at the detector is performed. In the PandaX-4T commissioning data of 0.
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- * We focused on low-energy events with specific ionization signals, detecting recoil energies ranging from 0.07 to 2.54 keV.
- * Our results set the strictest limits for dark matter interactions over various mass ranges, most notably getting closer to the predicted interactions from early Universe mechanisms.
A search for interactions from solar ^{8}B neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this search is further lowered compared with the previous search for dark matter, with various techniques utilized to suppress the background that emerges from data with the lowered threshold. A blind analysis is performed on the data with an effective exposure of 0.
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- The study focuses on measuring the half-life of two-neutrino double beta decay (DBD), which can help in the search for elusive Majorana neutrinos through neutrinoless double beta decay.
- Researchers used the PandaX-4T dual-phase Time Projection Chamber (TPC) with 3.7-tonne natural xenon and released data from 94.9 days of physics experiments.
- The resulting half-life measurement is 2.27 ± 0.03 () ± 0.10 () × 10 years, marking the first DBD half-life measurement with natural xenon and showcasing the effectiveness of a large-scale liquid xenon TPC for rare event searches.*
We report a search on sub-MeV fermionic dark matter absorbed by electrons with an outgoing active neutrino using the 0.63 tonne year exposure collected by the PandaX-4T liquid xenon experiment. No significant signals are observed over the expected background.
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- The study examines the absorption of fermionic dark matter by nuclei, which may provide a new way to detect light dark matter with a distinct monoenergetic signal.
- Researchers analyzed 95.0 days of data from the PandaX-4T commissioning run to look for signals of fermionic dark matter absorption via a neutral current process.
- They found no significant signal, establishing a minimum limit for the dark matter-nucleon interaction cross section at 1.5×10^{-50} cm^{2} for a fermionic dark matter mass of 40 MeV/c^{2} with 90% confidence.