Results for "Feng Yuan"

total 17469took 0.11s
Single Spin Asymmetry in Inclusive Hadron Production in pp Scattering from Collins MechanismApr 18 2008Apr 21 2008We study the Collins mechanism contribution to the single transverse spin asymmetry in inclusive hadron production in pp scattering p^{\uparrow}p\to \pi X from the leading jet fragmentation. The azimuthal asymmetric distribution of hadron in the jet leads ... More
Azimuthal Asymmetric Distribution of Hadrons Inside a Jet at Hadron ColliderSep 20 2007We study the azimuthal asymmetric distribution of hadrons inside a high energy jet in the single transverse polarized proton proton scattering, coming from the Collins effect multiplied by the quark transversity distribution. We argue that the Collins ... More
The Beam Single Spin Asymmetry in Semi-inclusive Deep Inelastic ScatteringOct 23 2003We study the beam single spin asymmetry in semi-inclusive hadron production in deep inelastic scattering in at order 1/Q. There are two competing contributions: the leading order transverse momentum dependent parton distribution $h_1^\perp(x,k_\perp)$ ... More
Luminous hot accretion flows: thermal equilibrium curve and thermal stabilityMay 28 2003Jul 29 2003In a previous paper, we presented the global solution of a new accretion flow model, namely luminous hot accretion flows (LHAFs). In this {\em Letter}, we first show the corresponding thermal equilibrium curve of LHAFs in the mass accretion rate vs. surface ... More
Heavy quarkonium production in double Pomeron exchange processes in perturbative QCDMar 20 2001Apr 09 2001We calculate the heavy quarkonium production in double pomeron exchange processes in perturbative QCD by using two-gluon exchange model. For the $P$-wave $\chi_J$ productions, we find $\chi_1$ and $\chi_2$ production amplitudes which vanish in the forward ... More
Collins Asymmetry at Hadron CollidersJan 22 2008We study the Collins effect in the azimuthal asymmetric distribution of hadrons inside a high energy jet in the single transverse polarized proton proton scattering. From the detailed analysis of one-gluon and two-gluon exchange diagrams contributions, ... More
Possible evidence for the disk origin for the powering of jets in Sgr A* and nearby elliptical galaxiesApr 14 2000Aug 08 2000The predicted radio flux for nearby ellipticals by the canonical ADAF(advection-dominated accretion flow) model is well above the observations. If the mass accretion rate favored by the numerical simulation were adopted, the ADAF model would also significantly ... More
A New Parameter In Accretion Disk ModelFeb 03 2000Taking optically thin accretion flows as an example, we investigate the dynamics and the emergent spectra of accretion flows with different outer boundary conditions (OBCs) and find that OBC plays an important role in accretion disk model. This is because ... More
Accretion models of Sgr A*Jul 07 2006The supermassive black hole in the center of our Galaxy, Sgr A*, is unique because the angular size of the black hole is the largest in the sky thus providing detailed boundary conditions on, and much less freedom for, accretion flow models. In this paper ... More
Accretion and ejection in Sgr A*Feb 16 2010We review our current understanding to the accretion and ejection processes in Sgr A*. Roughly speaking, they correspond to the quiescent and flare states of the source respectively. The high-resolution {\it Chandra} observations to the gas at the Bondi ... More
Heavy Quarkonium Production in Single Transverse Polarized High Energy ScatteringJan 28 2008We formulate the single transverse spin asymmetry in heavy quarkonium production in lepton-nucleon and nucleon-nucleon collisions in the non-relativistic limit. We find that the asymmetry is very sensitive to the production mechanism. The final state ... More
Sivers Function in the MIT Bag ModelAug 14 2003The Sivers function, an asymmetric transverse-momentum distribution of the quarks in a transversely polarized nucleon, is calculated in the MIT bag model. The bag quark wave functions contain both $S$-wave and $P$-wave components, and their interference ... More
Luminous hot accretion disksSep 13 2000Dec 05 2000We find a new two-temperature hot branch of equilibrium solutions for stationary accretion disks around black holes. In units of Eddington accretion rate defined as $10L_{\rm Edd}/c^2$, the accretion rates to which these solutions correspond are within ... More
Accretion flows: the Role of the Outer Boundary ConditionJul 23 1999We investigate the influences of the outer boundary conditions(OBCs) on the structure of an optically thin accretion flow. We find that OBC plays an important role in determining the topological structure and the profiles of the surface density and temperature ... More
Generalized Parton Distributions at x->1Nov 22 2003Generalized parton distributions at large $x$ are studied in perturbative QCD approach. As $x\to 1$ and at finite $t$, there is no $t$ dependence for the GPDs which means that the active quark is at the center of the transverse space. We also obtain the ... More
Advection-dominated Accretion: From Sgr A* to other Low-luminosity AGNsJan 23 2007This paper reviews our current understanding of low-luminosity AGNs (LLAGNs) in the context of the advection-dominated accretion flow. The best investigated source, the supermassive black hole in our galactic center, Sgr A*, is emphasized since the physics ... More
Normal-state pseudogap and electron flat dispersion in copper oxide materialsJun 06 2000The anomalous momentum and doping dependence of the electron spectral function and electron dispersion for copper oxide materials in the underdoped regime are studied within the t-J model. It is shown that the electron spectrum is changed with dopings, ... More
Effect of the additional second neighbor hopping on the charge dynamics in the t-J modelMar 17 2002The effect of the additional second neighbor hopping t' on the charge dynamics of the t-J model in the underdoped regime is studied within the fermion-spin theory. The conductivity spectrum of the t-t'-J model shows the low-energy peak and unusual midinfrared ... More
Pseudogap effects on the charge dynamics in the underdoped copper oxide materialsMay 13 2002Within the t-J model, the charge dynamics of copper oxide materials in the underdoped regime is studied based on the fermion-spin theory. It is shown that both in-plane charge dynamics and c-axis charge dynamics are mainly governed by the scattering from ... More
Quantum loop programsMay 25 2006Jan 04 2007Loop is a powerful program construct in classical computation, but its power is still not exploited fully in quantum computation. The exploitation of such power definitely requires a deep understanding of the mechanism of quantum loop programs. In this ... More
On the convective instability of hot radiative accretion flowsJan 20 2010Jun 11 2010How many fraction of gas available at the outer boundary can finally fall onto the black hole is an important question. It determines the observational appearance of accretion flows, and is also related with the evolution of black hole mass and spin. ... More
Parton Distributions in Light-Cone Gauge: Where Are the Final-State Interactions?Jun 06 2002Jul 02 2002We show that the final-state interaction effects in the single target spin asymmetry discovered by Brodsky et al. can be reproduced by either a standard light-cone gauge definition of the parton distributions with a prescription of the light-cone singularities ... More
Hot Accretion Flows Around Black HolesJan 03 2014Black hole accretion flows can be divided into two broad classes: cold and hot. Cold accretion flows, which consist of cool optically thick gas, are found at relatively high mass accretion rates. Prominent examples are the standard thin disk, which occurs ... More
TMD Evolution: Matching SIDIS to Drell-Yan and W/Z Boson ProductionAug 22 2013We examine the QCD evolution for the transverse momentum dependent observables in hard processes of semi-inclusive hadron production in deep inelastic scattering and Drell-Yan lepton pair production in $pp$ collisions, including the spin-average cross ... More
Hadronic Dijet Imbalance and Transverse-Momentum Dependent Parton DistributionsAug 31 2007We compare several recent theoretical studies of the single transverse spin asymmetry in dijet-correlations at hadron colliders. We show that the results of these studies are all consistent. To establish this, we investigate in particular the two-gluon ... More
Studying High Energy Final State Interactions by N/D MethodSep 07 1998Jan 26 1999We discuss the final state interaction effects at high energies via a multi-channel N/D method. We find that the 2 by 2 charge--exchange final state interactions typically contribute an enhancement factor of a few times $10^{-2}$ in the $B$ meson decay ... More
Observational evidence for AGNs feedback at parsec scaleMay 24 2011In a hot accretion flow, the radiation from the innermost region of the flow propagates outward and heats the electrons at large radii via Compton scattering. It has been shown in previous works that if the radiation is strong enough, $L\ga 2%L_{\rm Edd}$, ... More
Characterizing locally distinguishable orthogonal product statesJul 24 2007Bennett et al. \cite{BDF+99} identified a set of orthogonal {\em product} states in the $3\otimes 3$ Hilbert space such that reliably distinguishing those states requires non-local quantum operations. While more examples have been found for this counter-intuitive ... More
Single Spin Asymmetries in Heavy Quark and Antiquark ProductionsJun 11 2008The single transverse spin asymmetries in heavy quark and anti-quark production from the quark-antiquark annihilation channel contribution is studied by taking into account the initial and final state interactions effects. Because of the different color ... More
Global Neutrino Heating in Hyperaccretion FlowsJan 07 2013Feb 27 2013The neutrino-dominated accretion flow (NDAF) with accretion rates \dot{M} = 0.01 - 10 M_{\sun} s^{-1} is a plausible candidate for the central engine of gamma-ray bursts (GRBs). This hyperaccretion disk is optically thin to neutrinos in the radial direction, ... More
Rapidity dependence of large-p_t hadron production at RHICAug 24 2001We study the dependence of parton energy loss (quenching) on rapidity in ultra-relativistic nuclear collisions at RHIC. This can provides invaluable information on the density of the medium, which should be more dilute going away from mid-rapidity, thereby ... More
Episodic Jets as the Central Engine of Gamma-Ray BurstsJul 26 2012Most Gamma-ray bursts (GRBs) have erratic light curves, which demand that the GRB central engine launches an episodic outflow. Recent Fermi observations of some GRBs indicate a lack of the thermal photosphere component as predicted by the baryonic fireball ... More
Next-to-leading Order Calculation of the Single Transverse Spin Asymmetry in the Drell-Yan ProcessApr 02 2009Apr 27 2009We calculate the next-to-leading order perturbative QCD corrections to the transverse momentum weighted single transverse spin asymmetry in Drell-Yan lepton pair production in hadronic collisions. We identify the splitting function relevant for the scale ... More
Toward automatic verification of quantum cryptographic protocolsJul 19 2015Several quantum process algebras have been proposed and successfully applied in verification of quantum cryptographic protocols. All of the bisimulations proposed so far for quantum processes in these process algebras are state-based, implying that they ... More
When Equivalence and Bisimulation Join Forces in Probabilistic AutomataNov 14 2013Mar 08 2014Probabilistic automata were introduced by Rabin in 1963 as language acceptors. Two automata are equivalent if and only if they accept each word with the same probability. On the other side, in the process algebra community, probabilistic automata were ... More
Quantum Markov chains: description of hybrid systems, decidability of equivalence, and model checking linear-time propertiesJun 30 2015In this paper, we study a model of quantum Markov chains that is a quantum analogue of Markov chains and is obtained by replacing probabilities in transition matrices with quantum operations. We show that this model is very suited to describe hybrid systems ... More
Acute Triangulations of the Cuboctahedral SurfaceSep 20 2012In this paper we prove that the surface of the cuboctahedron can be triangulated into 8 non-obtuse triangles and 12 acute triangles. Furthermore, we show that both bounds are the best possible.
Combining Landau Zener Theory and Kinetic Monte Carlo Sampling for Small Polaron Mobility of Doped BiVO4Aug 07 2018Sep 17 2018Transition metal oxides such as \ce{BiVO4} are promising materials as photoelectrodes in solar-to-fuel conversion applications. However, their performance is limited by the low carrier mobility (especially electron mobility) due to the formation of small ... More
The Nature of X-ray Bright Optically Normal GalaxiesJan 08 2004May 24 2004Recent X-ray surveys by {\it Chandra} and {\it XMM-Newton} have revealed a population of X-ray bright, optically normal galaxies (XBONGs) at moderate redshifts. We propose that many XBONGs are powered by an inner radiatively inefficient accretion flow ... More
On hybrid models of quantum finite automataJun 11 2012Mar 27 2014In the literature, there exist several quantum finite automata (QFA) models with both quantum and classical states. These models are of particular interest,as they show praiseworthy advantages over the fully quantum models in some nontrivial aspects. ... More
Collins Fragmentation and the Single Transverse Spin AsymmetryMar 26 2009We study the Collins mechanism for the single transverse spin asymmetry in the collinear factorization approach. The correspondent twist-three fragmentation function is identified. We show that the Collins function calculated in this approach is universal. ... More
The Hardy-Rellich inequality and uncertainty principle on the sphereDec 17 2012Nov 11 2014Let $\Delta_0$ be the Laplace-Beltrami operator on the unit sphere $\mathbb{S}^{d-1}$ of $\mathbb{R}^d$. We show that the Hardy-Rellich inequality of the form $$ \int_{\mathbb{S}^{d-1}} \left | f (x)\right|^2 d\sigma(x) \leq c_d \min_{e\in \mathbb{S}^{d-1}} ... More
Single-Transverse Spin Asymmetries: From DIS to Hadronic CollisionsJul 22 2005Sep 28 2005We study single-spin asymmetries in semi-inclusive deep inelastic scattering with transversely polarized target. Based on the QCD factorization approach, we consider Sivers and Collins contributions to the asymmetries. We fit simple parameterizations ... More
Model Checking Quantum Systems --- A SurveyJul 25 2018This article discusses the essential difficulties in developing model-checking techniques for quantum systems that are never present in model checking classical systems. It further reviews some early researches on checking quantum communication protocols ... More
Dark Matter Particle Explorer observations of high-energy cosmic ray electrons plus positrons and their physical implicationsJul 31 2018The DArk Matter Particle Explorer (DAMPE) is a satellite-borne, high-energy particle and $\gamma$-ray detector, which is dedicated to indirectly detecting particle dark matter and studying high-energy astrophysics. The first results about precise measurement ... More
Radio--X-ray Correlation and the "Quiescent State" of Black Hole SourcesNov 29 2004Apr 28 2005Recently a correlation between the radio and X-ray luminosities is found, $L_{\rm R}\propto L_{\rm X}^{0.7}$, in black hole sources including black hole candidates in our galaxy and active galactic nuclei. We first show that the correlation can be understood ... More
Polynomial Approximation in Sobolev Spaces on the Unit Sphere and the Unit BallNov 12 2010This work is a continuation of the recent study by the authors on approximation theory over the sphere and the ball. The main results define new Sobolev spaces on these domains and study polynomial approximations for functions in these spaces, including ... More
Moduli of Smoothness and Approximation on the Unit Sphere and the Unit BallJul 28 2009Jan 13 2010A new modulus of smoothness based on the Euler angles is introduced on the unit sphere and is shown to satisfy all the usual characteristic properties of moduli of smoothness, including direct and inverse theorem for the best approximation by polynomials ... More
Maximal function and Multiplier Theorem for Weighted Space on the Unit SphereMar 30 2007For a family of weight functions invariant under a finite reflection group, the boundedness of a maximal function on the unit sphere is established and used to prove a multiplier theorem for the orthogonal expansions with respect to the weight function ... More
EigenNet: A Bayesian hybrid of generative and conditional models for sparse learningFeb 04 2011Feb 08 2011It is a challenging task to select correlated variables in a high dimensional space. To address this challenge, the elastic net has been developed and successfully applied to many applications. Despite its great success, the elastic net does not explicitly ... More
Energy Evolution for the Sivers Asymmetries in Hard ProcessesApr 18 2013Aug 12 2013We investigate the energy evolution of the azimuthal spin asymmetries in semi-inclusive hadron production in deep inelastic scattering (SIDIS) and Drell-Yan lepton pair production in pp collisions. The scale dependence is evaluated by applying an approximate ... More
Open Bisimulation for Quantum ProcessesJan 02 2012Quantum processes describe concurrent communicating systems that may involve quantum information. We propose a notion of open bisimulation for quantum processes and show that it provides both a sound and complete proof methodology for a natural extensional ... More
Doping dependence of the electron-doped cuprate superconductors from the antiferromagnetic properties of the Hubbard modelMar 02 2005Jul 25 2005Within the Kotliar-Ruckenstein slave-boson approach, we have studied the antiferromagnetic (AF) properties for the $t$-$t'$-$t''$-$U$ model applied to electron-doped cuprate superconductors. Due to inclusion of spin fluctuations the AF order decreases ... More
Kinematical correlations for Higgs boson plus High Pt Jet Production at Hadron CollidersSep 14 2014We investigate the effect of QCD resummation to kinematical correlations in the Higgs boson plus high transverse momentum (Pt) jet events produced at hadron colliders. We show that at the complete one-loop order, the Collins-Soper-Sterman resummation ... More
Transverse Momentum Resummation for Dijet Correlation in Hadronic CollisionsJun 19 2015We study the transverse momentum resummation for dijet correlation in hadron collisions based on the Collins-Soper-Sterman formalism. The complete one-loop calculations are carried out in the collinear factorization framework for the differential cross ... More
Heavy Quarkonium Production at Low Pt in NRQCD with Soft Gluon ResummationOct 12 2012Apr 16 2013We extend the non-relativistic QCD (NRQCD) prediction for the production of heavy quarkonium with low transverse momentum in hadronic collisions by taking into account effects from all order soft gluon resummation. Following the Collins-Soper-Sterman ... More
Soft Gluon Resummation in Higgs Boson Plus Two Jet Production at the LHCFeb 08 2018In this paper, the soft gluon resummation effect in the Higgs boson plus two-jet production at the LHC is studied. By applying the transverse momentum dependent factorization formalism, the large logarithms introduced by the small total transverse momentum ... More
Pseudogap effects on the c-axis charge dynamics in copper oxide materialsJan 19 2000The c-axis charge dynamics of copper oxide materials in the underdoped and optimally doped regimes has been studied by considering the incoherent interlayer hopping. It is shown that the c-axis charge dynamics for the chain copper oxide materials is mainly ... More
Long Range Correlation in Higgs Boson Plus Two Jets Production at the LHCApr 30 2016We study Higgs boson plus two high energy jets production at the LHC in the kinematics where the two jets are well separated in rapidity. The partonic processes are dominated by the t-channel weak boson fusion (WBF) and gluon fusion (GF) contributions. ... More
Nonmonotonic gap in the coexisting antiferromagnetic and superconducting state for electron-doped cuprate superconductorsOct 19 2005We argue that the experimentally observed nonmonotonic gap in electron-doped cuprates at optimal doping is the lowest quasiparticle excitation energy in the coexisting antiferromagnetic (AF) and superconducting (SC) state. The idea is implemented by studying ... More
Superconductivity in doped two-leg ladder cupratesMar 22 2006May 20 2006Within the t-J ladder model, superconductivity with a modified d-wave symmetry in doped two-leg ladder cuprates is investigated based on the kinetic energy driven superconducting mechanism. It is shown that the spin-liquid ground-state at the half-filling ... More
Effect of the additional second neighbor hopping on the spin dynamics in the t-J modelJun 06 2000The effect of the additional second neighbor hopping t' on the spin dynamics in the t-J model is studied within the fermion-spin theory. Although the additional second neighbor hopping t' is systematically accompanied with the reduction of the dynamical ... More
Momentum and doping dependence of the electron spectrum and ($π$,0) feature in copper oxide materialsApr 18 2000The momentum and doping dependence of the electron spectrum of copper oxide materials in the underdoped regime is studied within the t-J model. It is shown that the pseudogap opens near ($\pi$,0) point in the Brillouin zone, and the electron dispersion ... More
NLO QCD Corrections to $B_c$-to-Charmonium Form FactorsMar 10 2011Apr 15 2012The $B_c(^1S_0)$ meson to S-wave Charmonia transition form factors are calculated in next-to-leading order(NLO) accuracy of Quantum Chromodynamics(QCD). Our results indicate that the higher order corrections to these form factors are remarkable, and hence ... More
Soft Gluon Resummations in Dijet Azimuthal Angular Correlations at the ColliderMay 05 2014We derive all order soft gluon resummation in dijet azimuthal angular correlation in hadronic collisions at the next-to-leading logarithmic level. The relevant coefficients for the Sudakov resummation factor, the soft and hard factors, are calculated. ... More
Harnack Inequalities for Functional SDEs with Multiplicative Noise and ApplicationsDec 28 2010Feb 17 2011By constructing a new coupling, the log-Harnack inequality is established for the functional solution of a delay stochastic differential equation with multiplicative noise. As applications, the strong Feller property and heat kernel estimates w.r.t. quasi-invariant ... More
Single Spin Asymmetry Scaling in the Forward Rapidity Region at RHICJun 07 2011We investigate the scaling properties in inclusive hadron production and the associated single transverse spin asymmetry in the forward rapidity region at RHIC. We find that the spin-averaged experimental data in both $pp$ and $dAu$ collisions demonstrates ... More
On the Threshold Resummation in Forward pA CollisionsJun 09 2018In this paper, using the Higgs production in forward rapidity region in proton-nucleus collisions as an example, we demonstrate that we can construct a systematic formalism for the threshold resummation for forward rapidity particle productions in the ... More
Fundamental Plane of Black Hole Activity in Quiescent RegimeJan 22 2017A correlation among the radio luminosity ($L_{\rm R}$), X-ray luminosity ($L_{\rm X}$), and black hole mass ($M_{\rm BH}$) in active galactic nuclei (AGNs) and black hole binaries is known to exist and is called the "Fundamental Plane" of black hole activity. ... More
Transverse Spin Structure of the NucleonOct 22 2015We review the current status and future perspectives of theory and experiments of transverse spin phenomena in high-energy scattering processes off nucleon targets and related issues in nucleon structure and QCD. Systematic exploration of transverse spin ... More
Interpreting the radio/X-ray correlation of black hole sources based on the accretion-jet modelSep 09 2015Jan 06 2016Two types of correlations between the radio and X-ray luminosities ($L_R$ and $L_X$) have been found in black hole X-ray binaries. For some sources, they follow the `original' type of correlation which is described by a single power-law. Later it was ... More
Comment on "Next-to-leading order forward hadron production in the small-x regime: rapidity factorization" arXiv:1403.5221 by Kang et alJul 23 2014In a recent paper (arXiv:1403.5221), Kang et al.proposed the so-called "rapidity factorization" for the single inclusive forward hadron production in pA collisions. We point out that the leading small-x logarithm was mis-identified in this paper, and ... More
The Influences of Outflow on the Dynamics of InflowMar 21 2008Both numerical simulations and observations indicate that in an advection-dominated accretion flow most of the accretion material supplied at the outer boundary will not reach the inner boundary. Rather, they are lost via outflow. Previously, the influence ... More
Diffractive gluon jet production at hadron colliders in the two-gluon exchange modelApr 06 1999Following our recent paper on the calculations of diffractive quark jet production at hadron colliders, we present here the calculations of gluon jet production at hadron colliders in the two-gluon exchange parameterization of the Pomeron model. We use ... More
χ_{cJ} polarizations at the Fermilab TevatronSep 21 2000Dec 25 2000We propose the measurement of $\chi_{cJ}$ polarizations at high energy hadron colliders to study heavy quarkonium production mechanism. We find that the color-singlet model in the $k_t$ factorization approach predicts very different behavior for $\chi_{cJ}$ ... More
Diffractive J/psi production as a probe of the gluon component in the PomeronJan 18 1998Presented here is a study of the large p_T J/psi production in hard diffractive process by the pomeron exchange at the Fermilab Tevatron. We find that this process (p\bar p \to p+J/psi+X) can be used to probe the gluon content of the pomeron and to measure ... More
On a Lower Bound for the Time Constant of First-Passage PercolationJul 05 2008Jul 13 2008We consider the Bernoulli first-passage percolation on $\mathbb Z^d (d\ge 2)$. That is, the edge passage time is taken independently to be 1 with probability $1-p$ and 0 otherwise. Let ${\mu(p)}$ be the time constant. We prove in this paper that \[ \mu(p_1)-\mu({p_2})\ge ... More
Influence of the additional second neighbor hopping on the spin response in the t-J modelApr 18 2000Apr 27 2000The influence of the additional second neighbor hopping t' on the spin response of the t-J model in the underdoped and optimally doped regimes is studied within the fermion-spin theory. Although the additional second neighbor hopping t' is systematically ... More
Diffractive $\jpsi$ production through Color-Octet mechanism at hadron collidersApr 15 1998Jul 10 1998We propose the color-octet mechanism combined with the two gluon exchange model for the diffractive $J/\psi$ production in hadron collisions. In the leading logarithmic approximation (LLA) in QCD, we find that the diffractive $J/\psi$ production rate ... More
The Color-Octet intrinsic charm in $η^\prime$ and $B\to η^\prime X$ decaysJun 09 1997Color-octet mechanism for the decay B\to \eta^\prime X is proposed to explain the large branching ratio of Br(B\to \eta^\prime X)\sim 1\times 10^{-3} recently announced by CLEO. We argue that the inclusive \eta^\prime production in B decays may dominantly ... More
On the convective instability of hot radiative accretion flowsJun 10 2010Jun 11 2010How many fraction of gas available at the outer boundary can finally fall onto the black hole is an important question. It determines the observational appearance of accretion flows, and is also related with the evolution of black hole mass and spin. ... More
Critical Correlations of Wilson Lines in SU(3) and the High Energy $γ^*p$ Cross SectionMar 19 2002Mar 21 2002We discuss deep inelastic scattering at high energies as a critical phenomenon in 2+1 space - time dimensions. In the limit of Bjorken $x \to 0$, $QCD$ SU(3) with quark fields becomes a critical theory with a diverging correlation length $\xi(x) \propto ... More
On The Waiting Time for A M/M/1 Queue with ImpatienceApr 06 2017This paper focuses on the problem of modeling the correspondence pattern for ordinary people. Suppose that letters arrive at a rate $\lambda$ and are answered at a rate $\mu$. Furthermore, we assume that, for a constant $T$, a letter is disregarded when ... More
The Radiative Efficiency of Hot Accretion FlowsJul 12 2012Sep 03 2012Two significant progresses have been made in the past years on our understanding of hot accretion flows. One is that only a small fraction of accretion flow available at the outer boundary can finally falls onto the black hole while most of them is lost ... More
Non-Universality of Transverse Momentum Dependent Parton Distributions at Small-xMar 02 2010We study the universality issue of the transverse momentum dependent parton distributions at small-x, by comparing the initial/final state interaction effects in dijet-correlation in pA collisions with those in deep inelastic lepton nucleus scattering. ... More
Luminous hot accretion flows: the origin of X-ray emission of Seyfert galaxies and black hole binariesJan 06 2004Jul 29 2004We investigate accretion disc models for the X-ray emission of Seyfert-1 galaxies and the hard state of black-hole X-ray binaries. We concentrate on two hot accretion disc models: advection-dominated accretion flow (ADAF) and recently found luminous hot ... More
Diffractive light quark jet production at hadron colliders in the two-gluon exchange modelApr 06 1999Massless quark and antiquark jet production at large transverse momentum in the coherent diffractive processes at hadron colliders is calculated in the two-gluon exchange parametrization of the Pomeron model. We use the helicity amplitude method to calculate ... More
Diffractive charm jet production at hadron colliders in the two-gluon exchange modelOct 13 1998Sep 01 1999We present a calculation of diffractive charm jet production at hadron colliders in perturbative QCD based on the two-gluon exchange model. Differing from the previous calculations, we abandon the use of the effective color-singlet vitual gluon simplification, ... More
Dihadron Azimuthal Correlation from Collins Effect in Unpolarized Hadron CollisionsJan 01 2010We study the dihadron azimuthal correlation produced nearly back-to-back in unpolarized hadron collisions, arising from the product of two Collins fragmentation functions. Using the latest Collins fragmentation functions extracted from the global analysis ... More
Poincare Inequality on the Path Space of Poisson Point ProcessesJan 17 2008Nov 05 2008The quasi-invariance is proved for the distributions of Poisson point processes under a random shift map on the path space. This leads to a natural Dirichlet form of jump type on the path space. Differently from the O-U Dirichlet form on the Wiener space ... More
Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approachSep 19 2000May 13 2001We present a calculation for the polarizations of $J/\psi$ and $\psi'$ produced in the hadron collisions at the Fermilab Tevatron. Various color octet channels including ${}^1S_0^{(8)}$, ${}^3P_J^{(8)}$, and ${}^3S_1^{(8)}$ as well as contributions from ... More
BFKL and Sudakov Resummation in Higgs Boson Plus Jet Production with Large Rapidity SeparationJan 16 2018We investigate the QCD resummation for the Higgs boson plus a high $P_T$ jet production with large rapidity separations in proton-proton collisions at the LHC. The relevant Balitsky-Fadin-Kuraev-Lipatov (BFKL) and Sudakov logs are identified and resummed. ... More
Does the circularization radius exist or not for low angular momentum accretion?May 07 2014If the specific angular momentum of accretion gas at large radius is small compared to the local Keplerian value, one usually believes that there exists a "circularization radius" beyond which the angular momentum of accretion flow is almost a constant ... More
Initial and Final State Interaction Effects in Small-x Quark DistributionsAug 26 2010We study the initial and final state interaction effects in the transverse momentum dependent parton distributions in the small-$x$ saturation region. In particular, we discuss the quark distributions in the semi-inclusive deep inelastic scattering, Drell-Yan ... More
Single Transverse-Spin Asymmetries at Large-xOct 18 2006The large-$x$ behavior of the transverse-momentum dependent quark distributions is analyzed in the factorization-inspired perturbative QCD framework, particularly for the naive time-reversal-odd quark Sivers function which is responsible for the single ... More
The Structure and Variability of Sagittarius A*: Zooming in to the Supermassive Black Hole at the Galactic CenterMar 04 2002The Galactic center provides a unique astrophysical laboratory for us to study various astrophysical processes. In this paper, we review and outline the latest results from observations of Sgr~A$^*$ in terms of source structure and variations in flux ... More
Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large Transverse MomentaJan 11 2001Apr 25 2001We find supersaturation for the intrinsic gluon distribution of nuclei, i.e. the low $x$ unintegrated nuclear gluon distribution peaks at intermediate transverse momenta $k_t=Q_s$ and vanishes at zero $k_t$. Taking into account the intrinsic transverse ... More
A Note on the Paper $"$Poincaré Inequality on the Path Space of Poisson Point Processes"Sep 08 2010The priority of Liming Wu for the Poincar\'e inequality for birth-death processes on a Poisson space is announced.
Large transverse momentum direct photon production in the coherent diffractive processes at hadron collidersApr 06 1999Direct photon production at large transverse momentum in the coherent diffractive processes at hadron colliders is calculated in the two-gluon exchange model. We find that the amplitude for the production process is related to the differential off-diagonal ... More
High-$p_T$ $ψψ$ production as signals for Double Parton scattering at hadron collidersJun 09 1997Jul 18 1997We present an analysis of the \psi\psi production from double parton (DP) sacttering and single parton (SP) scattering in the large p_T region via color-octet gluon fragmentation. We find that at the Tevatron the DP \psi\psi production is at the edge ... More