X. Chen

ORCID: 0000-0003-4027-3305
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About
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Research Areas
  • Particle physics theoretical and experimental studies
  • High-Energy Particle Collisions Research
  • Particle Detector Development and Performance
  • Quantum Chromodynamics and Particle Interactions
  • Dark Matter and Cosmic Phenomena
  • Computational Physics and Python Applications
  • Neutrino Physics Research
  • Cosmology and Gravitation Theories
  • Distributed and Parallel Computing Systems
  • Radiation Detection and Scintillator Technologies
  • Medical Imaging Techniques and Applications
  • Advanced Optical Sensing Technologies
  • advanced mathematical theories
  • Astrophysics and Cosmic Phenomena
  • Superconducting Materials and Applications
  • Advanced Data Storage Technologies
  • Black Holes and Theoretical Physics
  • Muon and positron interactions and applications
  • Atomic and Subatomic Physics Research
  • Numerical Methods and Algorithms
  • Advanced Image Processing Techniques
  • Algorithms and Data Compression
  • Porphyrin Metabolism and Disorders
  • Advanced X-ray Imaging Techniques
  • Radiation Effects in Electronics

Shaanxi Provincial People's Hospital
2025

Shanxi Medical University
2025

Tsinghua University
2016-2025

Université Paris-Saclay
2024-2025

Collaborative Innovation Center of Quantum Matter
2016-2025

Shanghai Jiao Tong University
2024-2025

Jilin University of Chemical Technology
2024

CEA Paris-Saclay
2023-2024

Institut de Recherche sur les Lois Fondamentales de l'Univers
2023-2024

Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2023-2024

Abstract Neutrinos are copiously produced at particle colliders, but no collider neutrino has ever been detected. Colliders produce both neutrinos and anti-neutrinos of all flavors very high energies, they therefore highly complementary to those from other sources. FASER, the Forward Search Experiment LHC, is ideally located provide first detection study neutrinos. We investigate prospects for studies with FASER $$\nu $$ <mml:math...

10.1140/epjc/s10052-020-7631-5 article EN cc-by The European Physical Journal C 2020-01-01

We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in 13.6 TeV center-of-mass energy pp collision dataset 35.4 fb^{-1} using active electronic components FASER detector Large Hadron Collider. The candidates required to have track propagating through entire length and be consistent with muon charged-current interaction. infer 153_{-13}^{+12} significance 16 standard deviations above background-only...

10.1103/physrevlett.131.031801 article EN cc-by Physical Review Letters 2023-07-19

$\mathrm{FASER}\ensuremath{\nu}$ at the CERN Large Hadron Collider (LHC) is designed to directly detect collider neutrinos for first time and study their cross sections TeV energies, where no such measurements currently exist. In 2018, a pilot detector employing emulsion films was installed in far-forward region of ATLAS, 480 m from interaction point, collected $12.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ proton-proton collision data center-of-mass energy 13 TeV. We describe...

10.1103/physrevd.104.l091101 article EN cc-by Physical review. D/Physical review. D. 2021-11-24

The FASER experiment at the LHC is designed to search for light, weakly-interacting particles produced in proton-proton collisions ATLAS interaction point that travel far-forward direction. first results from a dark photons decaying an electron-positron pair, using dataset corresponding integrated luminosity of 27.0 fb−1 collected center-of-mass energy s=13.6 TeV 2022 Run 3, are presented. No events seen almost background-free analysis, yielding world-leading constraints on with couplings...

10.1016/j.physletb.2023.138378 article EN cc-by Physics Letters B 2023-12-07

Abstract FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such may be produced in very forward direction of LHC's high-energy collisions and then decay visible inside FASER detector, which placed 480 m downstream ATLAS interaction point, aligned with beam axis. also includes a sub-detector, ν , designed detect neutrinos LHC study their properties. In this paper, each...

10.1088/1748-0221/19/05/p05066 article EN cc-by Journal of Instrumentation 2024-05-01

A bstract The first FASER search for a light, long-lived particle decaying into pair of photons is reported. uses LHC proton-proton collision data at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 . 6 TeV collected in 2022 and 2023, corresponding to an integrated luminosity 57 7 fb − 1 model with axion-like particles (ALPs) dominantly coupled weak gauge bosons the primary target. Signal events are...

10.1007/jhep01(2025)199 article EN cc-by Journal of High Energy Physics 2025-01-31

The first results of the study high-energy electron neutrino (ν_{e}) and muon (ν_{μ}) charged-current interactions in FASERν emulsion-tungsten detector FASER experiment at LHC are presented. A 128.8 kg subset volume was analyzed after exposure to 9.5 fb^{-1} sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} interaction candidate events observed with a statistical significance 5.2σ (5.7σ). This is direct observation particle collider includes highest-energy ν_{μ} ever detected from an artificial...

10.1103/physrevlett.133.021802 article EN cc-by Physical Review Letters 2024-07-11

FASERnu is a proposed small and inexpensive emulsion detector designed to detect collider neutrinos for the first time study their properties. will be located directly in front of FASER, 480 m from ATLAS interaction point along beam collision axis unused service tunnel TI12. From 2021-23 during Run 3 14 TeV LHC, roughly 1,300 electron neutrinos, 20,000 muon 20 tau interact with TeV-scale energies. With ability observe these interactions, reconstruct energies, distinguish flavors, probe...

10.48550/arxiv.2001.03073 preprint EN other-oa arXiv (Cornell University) 2020-01-01

FASER is a new experiment designed to search for light weakly-interacting long-lived particles (LLPs) and study high-energy neutrino interactions in the very forward region of LHC collisions at CERN. The experimental apparatus situated 480 m downstream ATLAS interaction-point aligned with beam collision axis. detector includes four identical tracker stations constructed from silicon microstrip detectors. Three form tracking spectrometer, enable detect decay products LLPs decaying inside...

10.1016/j.nima.2022.166825 article EN cc-by Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2022-05-10

The Forward Search Experiment (FASER) at CERN’s Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand neutrino event rates. In this study, we update previous simulations present prescriptions for theoretical predictions of fluxes cross sections, together with their associated uncertainties. With these results, discuss potential...

10.1103/physrevd.110.012009 article EN cc-by Physical review. D/Physical review. D. 2024-07-12

LLMs demonstrate remarkable capabilities in following natural language instructions, largely due to instruction-tuning on high-quality datasets. While synthetic data generation has emerged as a scalable approach for creating such datasets, maintaining consistent quality standards remains challenging. Recent approaches incorporate feedback improve quality, but typically operate at the sample level, generating and applying each response individually. In this work, we propose Reference-Level...

10.48550/arxiv.2502.04511 preprint EN arXiv (Cornell University) 2025-02-06

Current Large Language Model (LLM) agents demonstrate strong reasoning and tool use capabilities, but often lack self-awareness, failing to balance these approaches effectively. This imbalance leads Tool Overuse, where models unnecessarily rely on external tools for tasks solvable with parametric knowledge, increasing computational overhead. Inspired by human metacognition, we introduce SMART (Strategic Model-Aware Reasoning Tools), a paradigm that enhances an agent's self-awareness optimize...

10.48550/arxiv.2502.11435 preprint EN arXiv (Cornell University) 2025-02-16

FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such may be produced in very forward direction of LHC's high-energy collisions and then decay visible inside FASER detector, which placed 480 m downstream ATLAS interaction point, aligned with beam axis. also includes a sub-detector, FASER$\nu$, designed detect neutrinos LHC study their properties. In this paper, each component...

10.48550/arxiv.2207.11427 preprint EN cc-by arXiv (Cornell University) 2022-01-01

Azimuthal anisotropy of produced particles is one the most important observables used to access collective properties expanding medium created in relativistic heavy-ion collisions. In this paper, we present second ($v_{2}$) and third ($v_{3}$) order azimuthal anisotropies $K_{S}^{0}$, $\phi$, $\Lambda$, $\Xi$ $\Omega$ at mid-rapidity ($|y|<$1) Au+Au collisions $\sqrt{s_{\text{NN}}}$ = 54.4 GeV measured by STAR detector. The $v_{2}$ $v_{3}$ are as a function transverse momentum centrality....

10.1103/physrevc.107.024912 article EN OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) 2023-02-22

Measurement by the STAR experiment at RHIC of cold nuclear matter (CNM) effects experienced inclusive J/ψ mid-rapidity in 0-100% p+Au collisions sNN = 200 GeV is presented. Such are quantified utilizing modification factor, RpAu, obtained taking a ratio yield to that p+p scaled number binary nucleon-nucleon collisions. The differential both and measured through dimuon decay channel, advantage trigger capability provided Muon Telescope Detector 2015 run. Consequently, RpAu derived within...

10.1016/j.physletb.2021.136865 article EN cc-by Physics Letters B 2022-01-06

The prospects of searching for the flavor changing neutral current effect in decay $t\ensuremath{\rightarrow}Hc$, $H\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\tau}$ are investigated with simulated $p\ensuremath{-}p$ collision data ATLAS detector at LHC, where Higgs mass is assumed to be 125 GeV. A fit based on constraints from and tau kinematics performed each event, which improves significantly top reconstruction helps signal-background separation. Boosted decision trees...

10.1103/physrevd.93.113010 article EN Physical review. D/Physical review. D. 2016-06-15

The search for a dark photon produced at $e^{+}e^{-}$ colliders which subsequently decays into inelastic matter particles, is discussed. heavier pair of visible charged particles and lighter particle after traveling some distance. decay products can be recorded by detector made emulsions gas detectors, placed near the main detector. This setup not only explore new parameter regions reached before, but also re-open thought to excluded previous experimental data. physics potential such around...

10.1016/j.physletb.2021.136076 article EN cc-by Physics Letters B 2021-01-22

We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in 13.6 TeV center-of-mass energy $pp$ collision data set 35.4 fb${}^{-1}$ using active electronic components FASER detector Large Hadron Collider. The candidates required to have track propagating through entire length and be consistent with muon charged-current interaction. infer $153^{+12}_{-13}$ significance 16 standard deviations above...

10.48550/arxiv.2303.14185 preprint EN cc-by arXiv (Cornell University) 2023-01-01

The authors use unified modelling language (UML) 2.0 interaction overview diagrams (IODs) and sequence to construct simple expressive scenario-based specifications, present an approach runtime verification of Java programs for exceptional consistency mandatory consistency. requires that any forbidden scenario described by a given IOD never happens during the execution program, if reference diagram occurs it must immediately adhere IOD. In approach, first instrument program under so as gather...

10.1049/iet-sen.2009.0009 article EN IET Software 2011-04-01

We propose to use slow muons facilities combined with cyclotron radiation detection for precision test of the weak interaction in muon decays. Slow positive bunches are first injected into a cylindrical superconducting vacuum chamber uniform strong axial magnetic fields radially confine muons. The positrons resulting from decays can be detected by their radiation, which transported low-noise electronic devices through waveguides coupled chamber. decay positron's energy precisely measured...

10.48550/arxiv.2401.05945 preprint EN other-oa arXiv (Cornell University) 2024-01-01

10.1016/j.nima.2024.169288 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2024-03-27

Streptomyces ahygroscopicusΔnysB is a genetically engineered strain that produces tetramycin by blocking the competition nystatin pathway.Response Surface Methodology (RSM) was used to optimize its fermentation medium composition.Taking yield of as response value, effects corn starch, glucose, fish peptone, (NH4)2SO4, KH2PO4, and CH3COONa on were investigated Plackett-Burman method three main factors glucose determined.The path steepest ascent test approach maximum region center point...

10.3844/ajbbsp.2024.84.93 article EN American journal of biochemistry & biotechnology/American journal of biochemistry and biotechnology 2024-01-01

This paper presents the energy resolution study in JUNO experiment, incorporating latest knowledge acquired during detector construction phase. The determination of neutrino mass ordering requires an exceptional better than 3\% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken design and production key components detector. Various factors affecting detection inverse beta decay signals impact on resolution, extending beyond statistical fluctuations detected...

10.48550/arxiv.2405.17860 preprint EN arXiv (Cornell University) 2024-05-28
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