J. M. Bian
A5068889019- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Cold Atom Physics and Bose-Einstein Condensates
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Potassium and Related Disorders
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Quantum and Classical Electrodynamics
University of California, Irvine
2017-2025
Yulin University
2025
UC Irvine Health
2020-2024
University of Minnesota System
2012-2024
University of Minnesota
2015-2024
Lanzhou University
2024
Monash University
2023
Monash Health
2023
Taranaki Base Hospital
2023
The Royal Melbourne Hospital
2023
We study the process ee+ e- → π+ π- J/ψ at a center-of-mass energy of 4.260 GeV using 525 pb(-1) data sample collected with BESIII detector operating Beijing Electron Positron Collider. The Born cross section is measured to be (62.9±1.9±3.7) pb, consistent production Y(4260). observe structure around 3.9 GeV/c2 in π(±)J/ψ mass spectrum, which we refer as Z(c)(3900). If interpreted new particle, it unusual that carries an electric charge and couples charmonium. A fit invariant neglecting...
We study e+e-→π+π-hc at center-of-mass energies from 3.90 to 4.42 GeV by using data samples collected with the BESIII detector operating Beijing Electron Positron Collider. The Born cross sections are measured 13 and found be of same order magnitude as those e+e-→π+π-J/ψ but a different line shape. In π±hc mass spectrum, distinct structure, referred Zc(4020), is observed 4.02 GeV/c2. Zc(4020) carries an electric charge couples charmonium. A fit invariant neglecting possible interferences,...
We study the process e+e−→(D∗¯D∗)±π∓ at a center-of-mass energy of 4.26 GeV using 827 pb−1 data sample obtained with BESIII detector Beijing Electron Positron Collider. Based on partial reconstruction technique, Born cross section is measured to be (137±9±15) pb. observe structure near (D∗¯D∗)± threshold in π∓ recoil mass spectrum, which we denote as Z±c(4025). The and width are (4026.3±2.6±3.7) MeV/c2 (24.8±5.6±7.7) MeV, respectively. Its production ratio...
The NOvA experiment has made a $4.4\sigma$-significant observation of $\bar\nu_{e}$ appearance in 2 GeV $\bar\nu_{\mu}$ beam at distance 810 km. Using $12.33\times10^{20}$ protons on target delivered to the Fermilab NuMI neutrino beamline, recorded 27 $\bar\nu_{\mu} \rightarrow \bar\nu_{e}$ candidates with background 10.3 and 102 \bar\nu_{\mu}$ candidates. This new antineutrino data is combined measure oscillation parameters $|\Delta m^2_{32}| = 2.48^{+0.11}_{-0.06}\times10^{-3}$ eV$^2/c^4$,...
We report results from the first search for νμ→νe transitions by NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in upgraded NuMI beam at Fermilab, we observe 6 events Far Detector, compared a background expectation of 0.99±0.11(syst) based Near Detector measurement. A secondary analysis observes 11 with 1.07±0.14(syst). The 3.3σ excess observed primary disfavors 0.1π<δCP<0.5π inverted mass hierarchy 90% C.L.Received 19 January...
We extract the $e^+e^-\rightarrow \pi^+\pi^-$ cross section in energy range between 600 and 900 MeV, exploiting method of initial state radiation. A data set with an integrated luminosity 2.93 fb$^{-1}$ taken at a center-of-mass 3.773 GeV BESIII detector BEPCII collider is used. The measured systematic uncertainty 0.9%. pion form factor $|F_\pi|^2$ as well contribution to leading order hadronic vacuum polarization $(g-2)_\mu$. find this value be $a_\mu^{\pi\pi,\rm LO}(600-900\;\rm MeV) =...
The sensitivity of the Deep Underground Neutrino Experiment (DUNE) to neutrino oscillation is determined, based on a full simulation, reconstruction, and event selection far detector simulation parameterized analysis near detector. Detailed uncertainties due flux prediction, interaction model, effects are included. DUNE will resolve mass ordering precision 5$\sigma$, for all $\delta_{\mathrm{CP}}$ values, after 2 years running with nominal design beam configuration. It has potential observe...
We present updated results from the NOvA experiment for $\nu_\mu\rightarrow\nu_\mu$ and $\nu_\mu\rightarrow\nu_e$ oscillations an exposure of $8.85\times10^{20}$ protons on target, which represents increase 46% compared to our previous publication. The utilize significant improvements in both simulations analysis data. A joint fit data $\nu_\mu$ disappearance $\nu_e$ appearance gives best point as normal mass hierarchy, $\Delta m^2_{32} = 2.44\times 10^{-3}{{\rm eV}^2}/c^4$,...
Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along beam collision axis, outside acceptance existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from ATLAS interaction point and shielded by concrete rock, will host suite experiments probe standard model (SM) processes search for physics beyond (BSM). In this report, we review status civil engineering plans explore...
The preponderance of matter over antimatter in the early universe, dynamics supernovae that produced heavy elements necessary for life, and whether protons eventually decay—these mysteries at forefront particle physics astrophysics are key to understanding evolution our its current state, eventual fate. DUNE is an international world-class experiment dedicated addressing these questions as it searches leptonic charge-parity symmetry violation, stands ready capture supernova neutrino bursts,...
We present new $ν_μ\rightarrowν_e$, $ν_μ\rightarrowν_μ$, $\overlineν_μ\rightarrow\overlineν_e$, and $\overlineν_μ\rightarrow\overlineν_μ$ oscillation measurements by the NOvA experiment, with a 50% increase in neutrino-mode beam exposure over previously reported results. The additional data, combined published neutrino antineutrino are all analyzed using improved techniques simulations. A joint fit to $ν_e$, $ν_μ$, $\overlineν_e$, $\overlineν_μ$ candidate samples within 3-flavor framework...
Hadronic transitions of ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ($J=0$, 1, 2) are searched for using a sample $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ $\ensuremath{\psi}(3686)$ events collected with the BESIII detector at BEPCII storage ring. The ${\ensuremath{\eta}}_{c}$ is reconstructed ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ and...
From December 2011 to May 2014, about 5 fb−1 of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 study charmonium-like states higher excited charmonium states. The time-integrated luminosity collected sample is measured a precision 1% by analyzing events produced large-angle Bhabha scattering process.
Using a sample of $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ decays collected by the BESIII detector, ${\ensuremath{\chi}}_{c0}$ and ${\ensuremath{\chi}}_{c2}$ into ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ $\ensuremath{\eta}\ensuremath{\eta}$ are studied. The branching fraction results...
Using a muon neutrino source at Fermilab, the NOvA collaboration has measured disappearance and electron appearance, strengthening constraints on $C\phantom{\rule{0}{0ex}}P$-violating phase in inverted-neutrino-mass-hierarchy case.
We report the first measurement of absolute hadronic branching fractions ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon at ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$ production threshold, in 30 years since discovery. In total, 12 Cabibbo-favored decay modes are analyzed with a double-tag technique, based on sample $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ collisions $\sqrt{s}=4.599\text{...
Data sets were collected with the BESIII detector at BEPCII collider center-of-mass energy of √s = 3.650 GeV during May 2009 and 3.773 from January 2010 to 2011. By analyzing large angle Bhabha scattering events, integrated luminosities two data are measured be (44.49±0.02±0.44) pb−1 (2916.94±0.18±29.17) pb−1, respectively, where first error is statistical second systematic.
The decays $\chi_{cJ}\to\gamma V$ ($V=\phi, \rho^0, \omega$) are studied with a sample of radiative $\psip\to\gamma\chi_{cJ}$ events in $(1.06\pm0.04)\times 10^{8} \psip$ collected the BESIII detector. branching fractions determined to be: ${\cal B}(\chi_{c1}\to \gamma\phi)=(25.8\pm 5.2\pm 2.3)\times 10^{-6}$, \gamma\rho^0)=(228\pm 13\pm 22)\times and \gamma\omega)=(69.7\pm 7.2\pm 6.6)\times 10^{-6}$. decay $\chi_{c1}\to \gamma\phi$ is observed for first time. Upper limits at 90% confidence...
With a sample of (225.2±2.8)×10(6) J/ψ events registered in the BESIII detector, J/ψ→γπ(+)π(-)η(') is studied using two η(') decay modes: η(')→π(+)π(-)η and η(')→γρ(0). The X(1835), which was previously observed by BESII, confirmed with statistical significance that larger than 20σ. In addition, π(+)π(-)η(') invariant-mass spectrum, X(2120) X(2370), are significances 7.2σ 6.4σ, respectively. For angular distribution radiative photon consistent expectations for pseudoscalar.
The Physics volume of the DUNE far detector (FD) Technical Design Report (TDR) presents science program DUNE. Within, we describe array identified scientific opportunities and key goals. Crucially, also report our best current understanding capability to realize these goals, along with detailed arguments investigations on which this is based. In context complete set TDR volumes, a central role for document basis underlying conception design LBNF/DUNE experimental configurations. As result,...
Based on data samples collected with the BESIII detector at BEPCII collider nine center of mass energies from 4.21 to 4.42 GeV, we search for production e^{+}e^{-}→ωχ_{cJ} (J=0, 1, 2). The process e^{+}e^{-}→ωχ_{c0} is observed first time, and Born cross sections sqrt[s]=4.23 4.26 GeV are measured be (55.4±6.0±5.9) (23.7±5.3±3.5) pb, respectively, where uncertainties statistical second systematic. ωχ_{c0} signals other seven e^{+}e^{-}→ωχ_{c1} ωχ_{c2} not significant, upper limits...