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有限温度和密度QCD中有效夸克质量的研究
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作者 吴强 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2000年第3期257-260,共4页
利用有限温度量子色动学的实时形式 ,研究了有限温度和密度条件下的有效夸克质量 .结果表明 ,有效夸克质量随温度的增加而迅速增加 ,而在夸克质量中的密度效应只是在低温区域才是重要的 ,且在给定的密度 。
关键词 量子色动学 温度 密度 有效夸克质量 低温区
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Monte Carlo Hamiltonian:Linear Potentials 被引量:5
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作者 LUOXiang-Qian HelmutKROEGER 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第5期561-565,共5页
We further study the validity of the Monte Carlo Hamiltonian method. The advantage of the method, in comparison with the standard Monte Carlo Lagrangian approach, is its capability to study the excited states. We cons... We further study the validity of the Monte Carlo Hamiltonian method. The advantage of the method, in comparison with the standard Monte Carlo Lagrangian approach, is its capability to study the excited states. We consider two quantum mechanical models: a symmetric one ; and an asymmetric one , for and , for . The results for the spectrum, wave functions and thermodynamical observables are in agreement with the analytical or Runge–Kutta calculations. 展开更多
关键词 Monte Carlo method quantum mechanics computational physics
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Study on Charged Top-Pion Decay Processes 被引量:3
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作者 WANGXue-Lei XUWen-Na DULin-Lin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第5期737-740,共4页
In the framework of top-color assisted technicolor (TC2) theory, we study the four decay processes of charged top-pion, i.e., . The decay branching ratio of these modes are calculated. The results show that the main d... In the framework of top-color assisted technicolor (TC2) theory, we study the four decay processes of charged top-pion, i.e., . The decay branching ratio of these modes are calculated. The results show that the main decay channels of charged top-pion are the tree level modes: and . Light is easier to be detected than heavy one at future coliders. So, the study provides us with some useful informations to search for charged top-pion. 展开更多
关键词 TOP-PION electroweak symmetry breaking decay processes
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Interplay Between Quark-Antiquark and Diquark Condensates in Vacuum in a Two-Flavor Nambu-Jona-Lasinio Model 被引量:1
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作者 ZHOU Bang-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第1期95-101,共7页
By means of a relativistic effective potential, we analytically research competition between the quark- antiquark condensates (qq) and the diquark condensates (qq) in vacuum in ground state of a two-flavor Nambu J... By means of a relativistic effective potential, we analytically research competition between the quark- antiquark condensates (qq) and the diquark condensates (qq) in vacuum in ground state of a two-flavor Nambu Jona Lasinio (NJL) model and obtain the Gs-Hs phase diagram, where Gs and Hs are the respective four-fermion coupling constants in scalar quark-antiquark channel and scalar color anti-triplet diquark channel. The results show that, in the chiral limit, there is only the pure (qq) phase when Gs/Hs 〉 2/3, and as Gs/Hs decreases to 2/3 〉 Gs/Hs ≥ 0 one will first have a coexistence phase of the condensates (qq) and (qq) and then a pure (qq) phase. In non-zero bare quark mass case, the critical value of Gs/Hs at which the pure (qq) phase will transfer to the coexistence phase of the condensates (qq) and (qq) will be less than 2/3. Our theoretical results, combined with present phenomenological fact that there is no diquark condensates in the vacuum of QCD, will also impose a real restriction to any given two-flavor NJL model which is intended to simulate QCD, i.e. in such model the resulting sma/lest ratio Gs/Hs after the Fierz transformations in the Hartree approximation must be larger than 2/3. A few phenomenological QCD-like NJL models are checked and analyzed. 展开更多
关键词 Nambu-Jona-Lasinio model quark-antiquark condensates diquark condensates effective potential chiral symmetry breaking color-superconductivity
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High Energy ^-pp and pp Elastic Scatterings in QCD Inspired Model 被引量:2
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作者 LU Juan MA Wei-Xing HE Xiao-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第4期715-718,共4页
We propose QCD inspired model to calculate ^-pp and pp elastic scatterings at high energies in this paper. A calculation for total cross section of ^-pp and pp is performed in which the contributions from gluon-gluon,... We propose QCD inspired model to calculate ^-pp and pp elastic scatterings at high energies in this paper. A calculation for total cross section of ^-pp and pp is performed in which the contributions from gluon-gluon, quark-quark, and gluon-quark interactions are included. Our results show that the QCD inspired model gives a perfect fit to experimental data of total cross section both for ^-pp and pp elastic scatterings at the whole energy region where experimental data existed at FNAL and CERN. 展开更多
关键词 QCD inspired model eikonal profile function high-energy elastic scattering
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Properties of Strange Matter in a Model with Effective lagrangian 被引量:1
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作者 WANGPing SURu-Keng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第1期61-66,共6页
The strange hadronic matter with nucleons, -hyperons and -hyperons is studied by using an effective nuclear model in a mean-field approximation. The density and strangeness fraction dependence of the effective baryon ... The strange hadronic matter with nucleons, -hyperons and -hyperons is studied by using an effective nuclear model in a mean-field approximation. The density and strangeness fraction dependence of the effective baryon masses as well as the saturation properties and stabilities of the strange hadronic matter are discussed. 展开更多
关键词 strange hadronic matter SATURATION STABILITY effective Lagrangian
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Modified Approach for Calculating Four-Quark Condensates 被引量:1
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作者 ZONG Hong-Shi SUN Wei-Min 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第2期293-298,共6页
By differentiating the dressed quark propagator with respect to a variable background field, the linear response of the dressed quark propagator in the presence of the background field can be obtained. From this gener... By differentiating the dressed quark propagator with respect to a variable background field, the linear response of the dressed quark propagator in the presence of the background field can be obtained. From this general method, using the vector background tield as an illustration, we extract a general formula for the four-quark condensate (0: q(0)γμq(0)q(0)γμq(0) : |0). This formula contains the corresponding fully dressed vector vertex. We use this formula to analyze the factorization problem of the four-quark condensate and show that in the bare vertex approximation factorization holds exactly. 展开更多
关键词 QCD vacuum four-quark condensates Dyson-Schwinger approach
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Dynamical Running Mass of Quark in the Dyson-Schwinger Equation Approach
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作者 MAWei-Xing SHENPeng-Nian 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第5期571-576,共6页
Based on the Dyson–Schwinger equations of QCD in the 'rainbow' approximation, the fully dressed quark propagator is investigated, and then an algebraic parametrization form of the propagator is obtained as a... Based on the Dyson–Schwinger equations of QCD in the 'rainbow' approximation, the fully dressed quark propagator is investigated, and then an algebraic parametrization form of the propagator is obtained as a solution of the equations. The dressed quark amplitudes and built up the fully dressed quark propagator and the dynamical running masses defined by and for light quarks u, d and s are calculated, respectively. Using the predicted running masses , quark condensates for u, d quarks, and for s quark, and experimental pion decay constant , the masses of Goldstone bosons K, π, and η are also evaluated. The numerical results show that the masses of quarks are dependent on their momentum . The fully dressed quark amplitudes and have correct behaviors which can be used for many purposes in our future researches on nonperturbative QCD. 展开更多
关键词 Dyson-Schwinger equations quark propagator quark mass the masses of Goldstone bosons
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A No—Go Theorem for Compatibility Between Involutions of First Order Differentials on a Lattice and Continuum Limit
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作者 DAIJian WUKe 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第3期301-303,共3页
We prove that the following three properties cannot match each other on a lattice, that differentials of coordinate functions are algebraically dependent on their involutive conjugates, that the involution on a lattic... We prove that the following three properties cannot match each other on a lattice, that differentials of coordinate functions are algebraically dependent on their involutive conjugates, that the involution on a lattice is an antihomomorphism, and that differential calculus has a natural continuum limit. 展开更多
关键词 INVOLUTION lattice differential antihomomorphism continuum limit no-go theorem
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Strange Meson Radiative Capture on the Proton in Low Energy QCD Lagrangian
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作者 ZHOULi-Juan MAWei-Xing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期333-336,共4页
Based on our low energy QCD Lagrangian description of strange meson photoproduction off the proton and the crossing symmetry, the strange meson radiative capture on the proton, , is investigated in the quark model of... Based on our low energy QCD Lagrangian description of strange meson photoproduction off the proton and the crossing symmetry, the strange meson radiative capture on the proton, , is investigated in the quark model of baryon structure with the same input parameter, the only strong coupling constant , as that in the strange meson photoproduction off the proton , a crossing channel of the capture reaction. A good agreement on the branching ratio between the predictions and data is obtained successfully. This excellent fit indicates that our low energy QCD Lagrangian theory with only one free parameter is an advanced and unified description of strange meson photoproduction and its associated radiative capture. 展开更多
关键词 low energy QCD quarks and gluons K+ photoproduction K- radiative capture
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Deconfinement Phase Transition Including Perturbative QCD Corrections in (Proto)neutron Star Matter
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作者 GU Jian-Fa GUO Hua +2 位作者 LEE Xi-Guo LIU Yu-Xin XU Fu-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第2期461-466,共6页
Deconlinement phase transition and neutrino trapping in (proto)neutron star matter are investigated in a chiral hadronic model (also referred to as the FST model) for the hadronic phase (HP) and in the color-fla... Deconlinement phase transition and neutrino trapping in (proto)neutron star matter are investigated in a chiral hadronic model (also referred to as the FST model) for the hadronic phase (HP) and in the color-flavor-locked (CFL) quark model for the deconlined quark phase. We include a perturbative QCD correction parameter αs in the CFL quark matter equation of states. It is shown that the CFL quark core with K^0 condensation forms in neutron star matter with the large value of αs. If the small value of αs is taken, hyperons suppress the CFL quark phase and the liP is dominant in the high-density region of (proto)neutron star matter. Neutrino trapping makes the fraction of the CFL quark matter decrease compared with those without neutrino trapping. Moreover, increasing the QCD correction parameter as or decreasing the bag constant B and the strange quark mass ms can make the fraction of the CFL quark matter increase, simultaneously, the fraction of neutrino in protoneutron star matter increases, too. The maximum masses and the corresponding radii of (proto)neutron stars are not sensitive to the QCD correction parameter αs. 展开更多
关键词 deconfinement phase transition neutrino trapping neutron star matter
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Nuclear Slope Parameter of pp and p Elastic Scattering in QCD Inspired Model
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作者 LU Juan MA Wei-Xing HE Xiao-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第2期456-460,共5页
Based on the quark-gluon structure of nucleon and the possible existence of Odderon in strong interaction process due to gluon self-interaction, the elastic scatterings of pp and p^-p at high energies are studied. The... Based on the quark-gluon structure of nucleon and the possible existence of Odderon in strong interaction process due to gluon self-interaction, the elastic scatterings of pp and p^-p at high energies are studied. The contributions from individual terms of quark-quark, gluon-gluon interactions, quark-gluon interference, and the Odderon terms to the nuclear slope parameter B(s) are analyzed. Our results show that the QCD inspired model gives a good fit to the LHC experimental data of the nuclear slope parameter. 展开更多
关键词 nuclear slope parameter QCD inspired model ODDERON
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The Production of Pseudo Goldstone Boson in Top Quark Rare Decay
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作者 HUANGJin-Shu LUGong-Ru 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第5期566-570,共5页
We calculate the flavor changing decay in the framework of the topcolor assisted multiscale technicolor model. We find that (a) the branching ratio of is insensitive to and , while it increases quickly as increase... We calculate the flavor changing decay in the framework of the topcolor assisted multiscale technicolor model. We find that (a) the branching ratio of is insensitive to and , while it increases quickly as increases; (b) for reasonable ranges of the parameters, the maximum of the branching ratio in this model may reach , seven orders larger compared to the one calculated in the standard model. This might provide an opportunity to detect the rare decay of the top quark in experiments. 展开更多
关键词 branching ratio rare decay of the top quark pseudo Goldstone boson TECHNICOLOR
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Detecting Toppion via a Flavor-Changing Single Top Quark Production Process
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作者 WANGXue-Lei XUSu-Jun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第5期587-590,共4页
In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of ... In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of neutral toppion to top and charm quark, toppion provides a large -channel resonance effect. The signal of single top production could be detected at LHC. Otherwise, the narrow peak in the invariant mass distribution could be clearly detected both at upgraded Tevatron and LHC. Therefore, such single top production process provides a unique way to test TC2 model via the detection of -channel neutral toppion contribution. 展开更多
关键词 topcolor-assisted technicolor model toppion electroweak symmetry breaking
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Gluon Transport Properties in the Region of Coexistence of Both Hadronic and QGP Phases
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作者 CHENXiang-Jun LIUWei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第4期439-442,共4页
The transport properties of gluon in color space in a system of coexistence of both hadronic and QGP phases are investigated from the quantum transport equation of gluon.
关键词 transport property coexistence of two phases GLUON color space
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Nonperturbative Aspects of Axial Vector Vertex
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作者 ZONGHong-Shi CHANGChao-Hsi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第4期461-464,共4页
It is shown how the axial vector current of current quarks is related to that of constituent quarks within the framework of the global color symmetry model.Gluon dressing of the axial vector vertex and the quark self-... It is shown how the axial vector current of current quarks is related to that of constituent quarks within the framework of the global color symmetry model.Gluon dressing of the axial vector vertex and the quark self-energy functions are described by the inhomogeneous Bethe-Salpeter equation in the ladder approximation and the Schwinger Dyson equation in the rainbow approximation,respectively. 展开更多
关键词 nonperturbative QCD constituent quark spontaneous chiral symmetry breaking
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The Top-Charm Associated Production Within the R-Parity Violating Supersymmetric Model in Photon-Proton Collisions
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作者 HOUHong-sheng MAWen-Gan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期337-346,共10页
The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within t... The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within the bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some parts of the parameter space. 展开更多
关键词 R-parity violation minimal supersymmetric standard model flavor changing neutral current
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Extended Quark Potential Model From Random Phase Approximation
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作者 DENGWei-Zhen CHENXiao-Lin 等 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期327-332,共6页
The quark potential model is extended to include the sea quark excitation using the random phase approximation. The effective quark interaction preserves the important QCD properties — chiral symmetry and confinement... The quark potential model is extended to include the sea quark excitation using the random phase approximation. The effective quark interaction preserves the important QCD properties — chiral symmetry and confinement simultaneously. A primary qualitative analysis shows that the π meson as a well-known typical Goldstone boson and the other mesons made up of valence quark pair such as the ρ meson can also be described in this extended quark potential model. 展开更多
关键词 quark model random phase approximation chiral symmetry
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Mixed Quark-Gluon Condensate Beyond Chiral Limit
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作者 卢常芳 吕晓夫 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第5期893-897,共5页
Using the Dyson-Schwinger equation and perturbation theory, we calculate the mixed quark-gluon condensates in the chiral limit and in the case of nonzero quark current mass for the light quark u/d and strange quark s.... Using the Dyson-Schwinger equation and perturbation theory, we calculate the mixed quark-gluon condensates in the chiral limit and in the case of nonzero quark current mass for the light quark u/d and strange quark s. The results show that the mixed quark-gluon condensate will decrease when the quark mass increases. For the quark with zero mass, we obtain mo2 = g(qσuvGuvq)/(qq) 0.68 GeV2, which is in good agreement with the QCD sum rules estimate mo2=(0.8± 0.2) GeV2. 展开更多
关键词 quark current mass mixed quark-gluon condensates QCD sum rule Schwinger Dyson equation Feynman rules
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Meson-Meson Scattering on Anisotropic Lattices
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作者 DUXi-Ning MIAOChuan MENGGuang-Wei LIUChuan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第1期119-126,共8页
Using the tadpole improved Wilson quark action on small, coarse, and anisotropic lattices, meson-meson scattering lengths are calculated within quenched approximation. The study covers pion-pion scattering in the I = ... Using the tadpole improved Wilson quark action on small, coarse, and anisotropic lattices, meson-meson scattering lengths are calculated within quenched approximation. The study covers pion-pion scattering in the I = 2 channel and kaon-pion scattering in the I = 3/2 channel. The results are extrapolated towards the chiral limit. Finite volume and finite lattice spacing errors are also analyzed and results in the infinite volume and continuum limit are obtained. Our results are compared with the results obtained using Roy equations, chiral perturbation theory, dispersion relations, and the experimental data. We also compare our results with other lattice results on the scattering lengths. 展开更多
关键词 scattering length lattice QCD improved actions
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