Zhenping Li

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Verified

Zhenping verified their affiliation via an institutional email.

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• PhD
• Engineer at National Oceanic and Atmospheric Administration

The machine learning (ML) solution consists of two ML processes running consecutively: the data training process to detect data pattern changes (DPC); and the clustering process to analyze DPCs generated from the data training process to detect anomalies. The data training process adopts a flexible approach by implementing different ML data models...

The meson photoproductions off nucleons in the chiral quark model are de- scribed. The role of the S-wave resonances in the second resonance region is dis- cussed, and it is particularly important for the Kaon, � and �' photoproductions. Meson photoproductions of nucleons have always been a very important field to study the structure of hadrons. It...

An application of the quark model with gluonic degrees of freedom to hybrid baryons is discussed. The photon-gluon transition operator for the process γq→qG is added to the electromagnetic interaction, where it plays an explicit role in quark-gluon systems. The successes of the three-valence-quark model in describing the magnetic moments of baryons...

Presentation at AMS 2025 on Satellite Digital Twins

Digital twins were initially introduced in 2002 for product life cycle management, and satellite digital twins were proposed in 2012. It has become an emerging technology that has generated growing interest in many fields, including healthcare, agriculture, aerospace engineering, urban planning and development, Earth science, and industry 4.0. Howe...

A Machine Learning System for data training, monitoring, and engineering analysis for satellite health and safety data.

Executive Summary Advanced Intelligent Monitoring System (AIMS) is a machine learning (ML) system deployed in operational environments to monitor the health and safety of satellites and their payload. AIMS implements a component software architecture with ML algorithm components as plugin-and-play software components and an incremental operation co...

The image navigation and registration (INR) performance assessment for the Geostationary Operational Environmental Satellite-R (GOES-R) Advanced Baseline Imager (ABI) is an image registration process at the subpixel level, which involves the registration of images from GOES-R ABI with corresponding images from Landsat at the same scene. We present...

This paper provides the detailed presentation on the ML solution for monitoring GOES-R ABI Instrument Radiometric Performance.

A machine learning system has been developed and implemented that automates the health and safety monitoring and performance evaluation of the new generation of spacecraft instruments. The machine-learning captures the time dependent trends of the instrument datasets through the data training, and a time dependent trend for a dataset consists of a...

Presentation at AMS 100 Conference, 2020 Boston

A machine learning (ML) framework for space missions has been developed to creates situational awareness and enables anomaly detection, dynamic data filtering and sensor data quality assessments. The ML framework covers four areas; the ML architecture model, ML algorithms and formulism for satellite datasets, a scalable and extensible ML platform,...

Data trending and monitoring are crucial in the spacecraft operations for maintaining the spacecraft health and safety and for evaluating the system performance and accuracy. The existing trend and data monitoring approaches are insufficient for time dependent datasets. The monitoring of these datasets would be very difficult if not possible withou...

The images in a short wave channel of GOES 15 Sounder show considerable striping effects. The study shows that there are two striping characteristics. The first is the detector to detector (D2D) striping caused by the overall sinusoidal oscillation behavior across East/West scan for each detector, and the second is the scan to scan (S2S) striping d...

Channel-to-channel co-registration is an important performance metric for the Geostationary Operational Environmental Satellite (GOES) Imager, and large co-registration errors can have a significant impact on the reliability of derived products that rely on combinations of multiple infrared (IR) channels. Affected products include the cloud mask, f...

The image resampling algorithm, fast Fourier transformation resampling (FFTR), is introduced. The FFTR uses a global function in the Fourier expansion form to represent an image, and the image resampling is achieved by the introduction of a phase shift in the Fourier expansion. The comparison with the cubic spline interpolation approach in the imag...

To track the degradation of the Imager visible channel on board NOAA’s Geostationary Operation Environmental Satellite (GOES), a research program has been developed using the stellar observations obtained for the purpose of instrument navigation. For monitoring the responsivity of the visible channel, we use observations of approximately fifty star...

Monitoring the responsivities of the visible channels of the Imagers on GOES satellites is a continuing effort at the National Environmental Satellite, Data and Information Service of NOAA. At this point, a large part of the initial processing of the star data depends on the operationalGOES Sensor Processing System(SPS) and GOES Orbit and AttitudeT...

Mixing angles are used to describe the SU(6) ⊗ O(3) symmetry breaking in [70, 1−] multiplet in the sector of the lowest mass nucleon resonances, which are investigated extensively in constituent quark models for baryon spectroscopy. The transition amplitudes for the meson photoproduction off nucleon can also be expressed in terms of the mixing angl...

Stars are regularly observed in the visible channels of the GOES Imagers for real-time navigation operations. However, we have been also using star observations off-line to deduce the rate of degradation of the responsivity of the visible channels. We estimate degradation rates from the time series of the intensities of the Imagers' output signals...

A formalism based on a chiral quark model ($\chi$QM) approach complemented with a one-gluon exchange model, to take into account the breakdown of the $SU(6)\otimes O(3)$ symmetry, is presented. The configuration mixing of wave functions for nucleon and resonances are derived. % With few adjustable parameters, differential cross-section and polarize...

A constituent quark model is developed for the reaction γp → ηp , allowing us to investigate all available data for differential cross-sections as well as single polarization asymmetries (beam and target) by including all of the PDG, one to four star, nucleon resonances (S11, P11, P13, D13, D15, F15, F17, G17, G19, H19, I1,11, and K1,13). Issues re...

Autonomic computing for spacecraft ground systems increases the system reliability and reduces the cost of spacecraft operations and software maintenance. In this paper, we present an autonomic computing solution for spacecraft ground systems at NASA Goddard Space Flight Center (GSFC), which consists of an open standard for the message oriented arc...

Results for the reaction gammap-->KLambda, studied within a constituent quark model and a dynamical coupled-channel approach, are presented and compared with recent data. Issues related to the search for missing baryon resonances are briefly discussed and the role played by a third S11 resonance is underlined.

Results for the reaction gamma p --> K+ Lambda, studied within a constituent quark model and a dynamical coupled-channel approach, are presented and compared with recent data. Issues related to the search for missing baryon resonances are briefly discussed and the role played by a third S_{11} resonance is underlined.

eta photoproduction data on the proton up to E=2 GeV are interpreted within a chiral constituent quark formalism, which embodies all known three and four star resonances. This study confirms the need for a new S11 resonance, with M=1.780 GeV and Gamma=280 MeV, already introduced in investigating lower energy data. Comment: 5 pages, 1 figure; invite...

eta photoproduction data on the proton up to E=2 GeV are interpreted within a chiral constituent quark formalism, which embodies all known three and four star resonances. This study confirms the need for a new S11 resonance, with M=1.780 GeV and Gamma=280 MeV, already introduced in investigating lower energy data.

Assessing the health of a space mission has traditionally been performed using telemetry analysis tools. Parameter values are compared to known operational limits and are plotted over various time periods. This presentation begins with the notion that there is an incredible amount of untapped information contained within the mission s event message...

Within a chiral constituent quark formalism, allowing the inclusion of all known resonances, a comprehensive study of the recent eta photoproduction data on the proton up to 2 GeV is performed. This study shows evidence for a new S11 resonances and indicates the presence of an additional missing P13 resonance.

We present a detailed quark-model study of pion photoproduction within the effective Lagrangian approach. Cross sections and single-polarization observables are investigated for the four charge channels, $\gamma p\to \pi^+ n$, $\gamma n\to \pi^- p$, $\gamma p\to \pi^0 p$, and $\gamma n\to \pi^0 n$. Leaving the $\pi N\Delta$ coupling strength to be...

An extensive and systematic study of the recent η photo-production data up to 1.2 GeV is presented within a chiral constituent quark model. A model embodying all known nucleonic resonances shows clear need for a yet undiscovered third S11 resonance in the second resonance region, for which we determine the mass (1.729 GeV) and the total width (183...

An extensive and systematic study of the recent eta photoproduction data up to 1.2 GeV is presented within a chiral constituent quark model. A model embodying all known nucleonic resonances shows clear need for a yet undiscovered third S11 resonance in the second resonance region, for which we determine the mass (1.729 GeV) and the total width (183...

A recently developed quark model approach to pseudoscalar meson photoproduction is extended to electroproduction process for the $\eta$ meson in the kinematics of momentum transfer $Q^2 \leq$ 4 (GeV/c)$^2$ and total center of mass energy $W \leq$ 1.6 GeV. Existing data are well reproduced and the roles of the $S_{11}(1535)$ and $D_{13}(1520)$ reson...

We develop an ansatz of the sigma enhancement of the I=0, L=0 π–π scattering amplitude as arising from a low-energy glueball pole. Using this picture we estimate the π0π0 to π0 branching ratio for the decays of the Roper resonance, which we previously found to be a hybrid in our QCD sum rule calculation.

The reaction is investigated in the quark model approach. The quark model predicts that the off-shell contributions from the resonance dominate the production in the threshold region. We find that the coupling constant from the fit to a few total cross section data is small. The results of the total and differential cross sections are presented at...

Within a quark model the process γp → ηp, for Eγlab < 1.2 GeV, is investigated. We find that the recent data from GRAAL on the polarized beam asymmetry require significant contributions from the resonances D13(1520), F15(1680), and to a lesser extent from P13(1720) in addition to those from the dominant S11(1535) resonance, implied by the Mainz dif...

Preliminary results of the analysis of the reaction gamma+p-->K0+Sigma+ are presented. We show the first measurement of the differential cross section and data for the total cross section, which are much improved with respect to previous measurements. The data are compared with model predictions from different isobar and quark models that give a go...

Preliminary results of the analysis of the reaction γ + p → K0 + Σ+ are presented. We show the first measurement of the differential cross section and data for the total cross section, which are much improved with respect to previous measurements. The data are compared with model predictions from different isobar and quark models that give a good d...

A quark model approach to the photoproduction of vector mesons off nucleons is proposed. Its starting point is an effective Lagrangian of the interaction between the vector meson and the quarks inside the baryon, which generates the non-diffractive s- and u- channel resonance contributions. Additional t-channel $\pi^0$ and $\sigma$ exchanges are in...

A longitudinal transition operator that satisfies the gauge invariance requirement is introduced in constituent quark model. The corresponding longitudinal transitions between the nucleon and baryon resonances are calculated. We show that the study of the longitudinal coupling plays an important role in understanding the structure of baryons. PACS...

We test the Gerasimov-Drell-Hearn (GDH) sum rule numerically by calculating the total photon absorption cross sections and on the nucleon via photon excitation of baryon resonances in the constituent quark model. A total of seventeen, low-lying, non-strange baryon resonances are included in this calculation. The transverse and longitudinal interfer...

An investigation of $\gamma p\to \omega p$ is presented in a constituent quark model approach. The sparse data in the large $t$ region where the resonances dominate is well described within the model, while the diffractive behavior in the small $t$ region requires an additional t-channel exchange. Taking into account the t-channel $\pi^0$ exchange,...

A unified approach to vector meson photoproductions is presented in the constituent quark model. The s- and u-channel resonance contributions are generated using an effective quark vector-meson Lagrangian. Taking into account π0 and σ t-channel exchanges for diffractive production in ω and ρ0 productions respectively, the available total and differ...

We analyse K-meson photoproduction off proton and its associated radiative capture process in Low Energy QCD Lagrangian. The two processes are related to each other by the Crossing Symmetry. In the framework of chiral quark model, we give a unified description of the two processes. Our theoretical prediction for branching ratio in radiative capture...

A quark model approach to the photoproduction of vector mesons off nucleons is proposed. Its starting point is an effective Lagrangian of the interaction between the vector meson and the quarks inside the baryon. This paper develops the formalism and highlights the dynamical roles of s-channel resonances. It is demonstrated that the proposed approa...

We develop an ansatze of the sigma enhancement of the I=0, L=0 $\pi$-$\pi$ scattering amplitude as arising from a low-energy glueball pole. Using this picture we estimate the $\pi^0\pi^0$ to $\pi^0$ branching ratio for the decays of the Roper resonance, which we previously found to be a hybrid in our QCD sum rule calculation. We find that the sigma...

A unified approach to the pseudoscalar meson (π, η, and K) photoproductions off nucleons are presented. It begins with the low energy QCD Lagrangian, and the resonances in the s and u channels are treated in the framework of the quark model. The duality hypothesis is imposed to limit the number of the t-channel exchanges. The CGLN amplitudes for ea...

In this talk, I shall discuss the signatures of glueballs in the J/ψ radiative decays. Further experimental and theoretical investigations are suggested.

The recent investigations in the chiral quark model show that kaon productions of nucleons play an important role in understanding the structure of baryons. The evidences of a third S 11 resonance in the second resonance region and two narrow states around 2 GeV suggest a set of the molecular type baryons with the hidden strangeness. Confirmin...

An unified approach to the pseudo scalar meson ($\pi, \eta$, and $K$) photoproduction off nucleons are presented. It begins with the low energy QCD Lagrangian, and the resonances in the s- and u- channels are treated in the framework of the quark model The duality hypothesis is imposed to limit the number of the t-channel exchanges. The CGLN amplit...

The isospin symmetry breakings of qq¯ are investigated in the QCD sum rule method. The electromagnetic effects are evaluated following the procedure requiring that the electromagnetic effects for a charged meson be gauge invariant. We find that the electromagnetic effects are also dominant in the isospin violations of the ρ mesons, which have been...

The meson photoproductions off nucleons in the chiral quark model are described. The role of the S-wave resonances in the second resonance region is discussed, and it is particularly important for the Kaon, $\eta$ and $\eta'$ photoproductions.

Recent experiments show that the isospin-violating mass splitting of the B mesons is very small, but the best fits with a QCD sum rule analysis give a splitting of at least 1.0 MeV. The isospin-violating mass splittings of the charmed mesons, on the other hand, are in agreement with experiment. In this letter we show that the inclusion of 2nd kind...

We develop tools to determine the gluonic content of a resonance of known mass, width and $J^{PC}$ from its branching fraction in radiative quarkonium decays and production cross section in $\gamma \gamma$ collisions. We test the procedures by applying them to known $q\bar{q}$ mesons, then analyze four leading glueball candidates. We identify incon...

In this paper, we present a calculation of the four isospin channels of the kaon photoproduction γN→KΣ in the framework of the chiral quark model. The relative strength and phases in each isospin channel are determined by the quark model wave function with SU(6)⊗O(3) symmetry. The duality hypothesis is imposed to limit the number of the t channel e...

In this paper, we investigate the effects of the quantity sigmaTS on the spin structure functions of nucleons in the resonance region. The Schwinger sum rule for the spin structure function g2(x,Q2) at the real photon limit is derived for the nucleon treated as a composite system, and it provides a crucial constraint on the longitudinal transition...

The reaction $\gamma + p\to \eta^\prime + p$ is investigated in the quark model approach. The quark model predicts that the off-shell contributions from the resonance $S_{11}(1535)$ dominate the $\etap$ production in the threshold region. We find that the coulping constant $\alpha_{\etap NN}$ from the fit to a few total cross section data is small....

We review the status of the $S_{11}$ N$^*$ resonances in light of some recent theoretical and phenomenological results. Whereas the quark model predicts two such resonances around 1.6 GeV, there is considerable evidence for a third $S_{11}$ resonance in this energy range. This suggests that a $K\Sigma$ or $K\Lambda$ quasi-bound state may indeed exi...

We review the status of the {ital S}ââ N{sup *} resonances in light of some recent theoretical and phenomenological results. Whereas the quark model predicts two such resonances around 1.6 GeV, there is considerable evidence for a third {ital S}ââ resonance in this energy range. This suggests that a {ital K}Σ or {ital K}Î quasibound state may...

Hybrid baryons, consisting of the three light quarks and a gluon, are investigated using the QCD sum rule method. We find that the mixed condensate 〈0$\Vert${}$\psi${}\ifmmode\bar\else\textasciimacron\fi{}$\sigma${}G$\psi${}$\Vert${}0〉=${\mathit{m}}_{0}^{2}$〈0$\Vert${}$\psi${}\ifmmode\bar\else\textasciimacron\fi{}$\psi${}$\Vert${}0〉 plays a dominan...

In this paper, we present our study on the $\eta$ photoproduction based on the chiral quark model. We find that quark model provides a very good description of the $\eta$ production with much less parameters, and the threshold region is not a reliable source to determine the $\eta NN$ coupling constant due to its strong dependence on the properties...

A gauge invariant electromagnetic two-point function, crucial to the investigations of the violation of isospin symmetry, is derived for heavy-light quark systems. Thus QED can be consistently introduced into the QCD Sum Rule method, which was not previously possible. Comment: 7 page in Latex, and 2 ps. figure can be obtained from the author

Department of Physics, Beijing University, Beijing 100871, People's Republic of China CCAST(World Laboratory), PO Box 8730, Beijing 100080, People's Republic of China § Institute of High Energy Physics, The Chinese Academy of Sciences, PO Box 918 Beijing, 100039, People's Republic of China

A gauge invariant electromagnetic two-point function, crucial to the investigations of the violation of isospin symmetry, is derived for heavy-light quark systems. Thus QED can be consistently introduced into the QCD Sum Rule method, which was not previously possible.

In this paper, we show that the low energy theorem (LET) of the threshold pion-photoproduction can be fully recovered in the quark model. An essential result of this investigation is that the quark-pion operators are obtained from the effective chiral Lagrangian, and the low energy theorem does not require the constraints on the internal structures...

We discuss the spin structure of nucleons in a quark model with gluonic degrees of freedom. The sum rules for polarized protons and neutrons are related to nucleon magnetic moments. In particular, when the ratio of the proton and neutron magnetic moments is larger than -3/2 the sum rule for polarized neutrons is negative, in agreement with recent e...

The method of QCD sum rules is applied to light-heavy quark systems, with detail treatment of the D and B mesons. We calculate the masses for the pseudo-scalar and vector states and their leptonic decay constants in a unified approach. This work is supported by the U.S. National Science Foundation grant PHY-9023586.

The mass splittings of the pseudoscalar and vector D and B light-heavy quark systems have been calculated using the method of QCD sum rules. Electromagnetic, quark mass, and nonperturbative QCD effects are all included. The results are in good agreement with experiment. A measurement of isospin splitting for the vector B mesons would give valuable...

In this paper, we show what we can learn from the CEBAF experiments on spin-structure functions, and the transition from the Drell-Hearn-Gerasimov sum rule in the real photon limit to the spin dependent sum rules in the deep inelastic scattering, and how the asymmetry $A_1(x,Q^2)$ approaches the scaling limit in the resonance region. The spin struc...

In this paper, we show what we can learn from the CEBAF experiments on spin-structure functions, and the transition from the Drell-Hearn-Gerasimov sum rule in the real photon limit to the spin dependent sum rules in the deep inelastic scattering, and how the asymmetry $A_1(x,Q^2)$ approaches the scaling limit in the resonance region. The spin struc...

We extend the quark Born diagram formalism for hadron-hadron scattering to processes with valence $q\bar q$ annihilation, specifically $I=0$ and $I=1$ $\pi\pi$ and $I=1/2$ $K\pi$ elastic scattering. This involves the $s$-channel hybrid annihilation process $q^2\bar q^2 \to q\bar q g \to q^2\bar q^2$ and conventional $s$-channel $q\bar q$ resonances...

The low energy theorem of threshold pion-photoproductioll is shown to be fully recovered in the quark model. The leading contributions to the isospin amplitucles at O(p") are from the transition between the P-wave baryons and the nucleon, and from the charge radius of the nucleon. The leading contribution from the P-wave baryons only affects neutra...

A Comment on the Letter by J. Soffer and O. Teryaev, Phys. Rev. Lett. 70, 3373 (1993).

In this paper, we argue that the effects of the Drell-Hearn-Gerasimov (DHG) sum rule should be included to extract the sum rule of polarized neutrons from the recent Spin Muon Collaboration measurement of the spin-dependent structure function g1(x) of the deuteron, since the measurement was obtained at fairly low Q2. The value GAMMA = integral-1/0...

In this paper, we present a framework to calculate the amplitude of Compton scattering in the quark model; the Thomson limit and the Low energy theorem are satisfied explicitly. We find that there is a relativistic correction to the electric polarizability of the nucleon if the Low energy theorem is satisfied. The analytical expressions for the nuc...

In this paper, we argue that the effects of the Drell-Hearn-Gerasimov (DHG) sum rule should be included to extract the sum rule of polarized neutrons from the recent Spin Muon Collaboration measurement of the spin-dependent structure function g1(x) of the deuteron, since the measurement was obtained at fairly low Q2. The value Γ≡F10g1(x)dx could be...

In this paper, we show how the Drell-Hearn-Gerasimov (DHG) sum rule in the real photon limit can be generalized to electroproduction, and related to the sum rules in deep inelastic scattering. A general Q2 dependence for the polarized function is discussed, particularly in the resonance region. The resonance P33(1232) plays a very important role in...

The Q^2 dependence of the helicity amplitudes for the Roper resonance as a hybrid state is presented.Our study shows that the magnitude of the transverse helicity amplitude decreases rapidly as Q^2 increases, while the longitudinal helicity amplitude vanishes for the hybrid state.This feature is quite different from the prediction of the q^3 potent...

We show how heavy quark effective theory, including 1/M corrections, may be matched onto dynamical quark models by making a specific choice of K,m and v in the p=mv+K expansion. We note that Wigner rotations of heavy quark spins arise at $O(p^2/m^2)$ in non-relativistic models but at $O(\Lambda_{QCD}/M_Q)$ or O(velocity-transfer) in HQET and so are...

The couplings of conventional and hybrid mesons to γγ (real and virtual) and their production amplitudes in ψ→γM are described in a unified manner. Existing results for heavy quarks are recovered, extensions to light quarks and to virtual γ couplings are made and phenomenological applications discussed. In particular we discuss relativistic correct...

It is shown how perturbative Quantum Chromodynamics (QCD) can successfully describe the data on the helicity structure of tensor mesons produced in psi to gamma T decay. The new feature is that the diagrams are separated according to their different topologies, the corresponding helicity structures being analyzed for each diagram in the quark model...

Theories of the two photon coupling of P-wave positronium and qq(bar) systems are reviewed and a relationship is established between field theoretical calculations and the Vector Meson Dominance (VMD) model for both heavy and light quark systems. Relativistic corrections to the two photon decay rates are evaluated and found to be very important for...

The couplings of conventional and hybrid mesons to gamma gamma (real and virtual) and their production amplitudes in psi to gammaM are described in a unified manner. Existing results for heavy quarks are recovered; extensions to light quarks and to virtual gamma couplings are made; and phenomenological applications discussed. In particular relativi...

Theories of the two-photon couplings of P-wave positronium and qq¯ systems are reviewed and a relationship is found between field-theoretic calculations of qq¯-->gammagamma and the vector-meson-dominance model for both heavy- and light-quark systems. Relativistic corrections to the two-photon decay rates are evaluated and are found to be very impor...

The theories on photo- and electroproduction of baryon resonances in the nonrelativistic constituent quark model (NCQM) are reviewed. The electromagnetic interaction for a three-body system is discussed, with particular emphasis on the relativistic corrections and the role of binding potential, which have been neglected in previous calculations. Th...

Theories of the two-photon couplings of {ital P}-wave positronium and {ital q{bar q}} systems are reviewed and a relationship is found between field-theoretic calculations of {ital q{bar q}}{r arrow}γγ and the vector-meson-dominance model for both heavy- and light-quark systems. Relativistic corrections to the two-photon decay rates are evaluated...

We review and update the theory on photo- and electroproduction in the nonrelativistic constituent quark model (NRCQM). The electromagnetic interaction Hamiltonian for a three-quark system is discussed, particularly the nonadditive term and the role of the binding potential which have been neglected in previous calculations. We find that the succes...

The photo- and electroproduction of baryon resonances are calculated in the constituent quark model with chromodynamics of Isgur and Karl consistently to $O(\frac{{v}^{2}}{{c}^{2}})$ for the quarks. We find that the successes of the nonrelativistic quark model are preserved, some problems are removed, and QCD mixing effects may become important wit...

We review and update the theory on photo- and electroproduction in the nonrelativistic constituent quark model (NRCQM). The electromagnetic interaction Hamiltonian for a three-quark system is discussed, particularly the nonadditive term and the role of the binding potential which have been neglected in previous calculations. We find that the succes...

We extend the quark Born diagram formalism for hadron-hadron scattering to pro-