In this article,a comprehensive study of the fission process of Th,U,Pu,and Cm isotopes using a Yukawa-folded meanfield plus standard pairing model is presented.The study focused on analyzing the effects of the pairin...In this article,a comprehensive study of the fission process of Th,U,Pu,and Cm isotopes using a Yukawa-folded meanfield plus standard pairing model is presented.The study focused on analyzing the effects of the pairing interaction on the fragment mass distribution and its dependence on nuclear elongation.The significant role of pairing interactions in the fragment mass distributions of^(230)Th,^(234)U,^(240)Pu,and^(246)Cm was demonstrated.Numerical analysis revealed that increasing the pairing interaction strength decreased the asymmetric fragment mass distribution and increased the symmetric distribution.Furthermore,the odd-even mass differences at symmetric and asymmetric fission points were examined,highlighting their sensitivity to changes in the pairing interaction strength.Systematic analysis of the Th,U,Pu,and Cm isotope fragment mass distributions demonstrated the effectiveness of the model in reproducing the experimental data.In addition,the effects of the zero-point energy and half-width parameter on the fragment mass distribution for^(240)Pu were explored.Thus,this study provides valuable insights into the fission process by emphasizing the importance of pairing interactions and their relationship with nuclear elongation.展开更多
Based on the littlest Higgs model, we investigate the spin correlation of the top quark pair production via the process e^＋e^- →tt at the high energy linear e^＋e^- collider （ILC） with a centre-of-mass energy √S ...Based on the littlest Higgs model, we investigate the spin correlation of the top quark pair production via the process e^＋e^- →tt at the high energy linear e^＋e^- collider （ILC） with a centre-of-mass energy √S = 800 GeV. Our numerical results show that the gauge boson ZH generates very small corrections to the spin correlation observable C in all the parameter space allowed by the electroweak data. However, with reasonable values of the free parameters, the value of the relative correction parameter RBH = （CBH-CSM）/CSM can reach 10%, which might be detected in future ILC experiments.展开更多
The dynamical attractor of the modified Chaplygin gas （MCG） model is studied. The dynamical analysis indicates that the phase ωMCG = -1 is a dynamical attractor and the equation of state of the MCG approaches it fr...The dynamical attractor of the modified Chaplygin gas （MCG） model is studied. The dynamical analysis indicates that the phase ωMCG = -1 is a dynamical attractor and the equation of state of the MCG approaches it from either ωMCG 〉 -1 or ωMCG 〈 -1, independent of the choice of its initial density parameter and the ratio of pressure to critical energy density. Therefore our universe will not end up with Big Rip in the future. Moreover, the evolutions of the density parameters Ωγ and ΩMCG are quite different. For different initial values of x and y, Ωγ decreases and ΩMCG increases as time increases, and they will eventually approach Ωe = 0 and ΩMCG = 1, i.e., de Sitter phase. This implies that when there is not the interaction （i.e., the energy transfer） between the barotropic background fluid and modified Chaplygin gas （MCG）, the behaviour of the MCG will be similar to ACDM in the future.展开更多
For the variable generalized Chaplygin gas （VGCG） as a dynamical system, its stability is analyzed and the related dynamical attractors are investigated. By analysis it is shown that there are two critical points co...For the variable generalized Chaplygin gas （VGCG） as a dynamical system, its stability is analyzed and the related dynamical attractors are investigated. By analysis it is shown that there are two critical points corresponding to the matter-dominated phase and the VGCG dark energy-dominated phase, respectively. Moreover, when the parameters n, a and γ take some fixed values, the phase with ωVGCG = --0.92 is a dynamical attractor and the equation of state of VGCG reaches it from either ωVGCG 〉 --1 or ωVGCG 〈 --1, independent of the initial values of the dynamical system. This shows a satisfactory cosmological model： the early matter-dominated era, followed by the dark energy-dominated era. Meanwhile, the evolutions of density parameters Ωγ and ΩVGCG are quite different from each other. For different initial values of x and y, Ωγ decreases and ωVGCG increases as the time grows, they will eventually approach Ωγ = 0 and ωVGCG ---- 1. Furthermore, since different values of n or a may lead to different equation-of-state parameters ωVGCG, we also discuss the constraints on the parameters n and by the observation data.展开更多
Based our previous work [Mod. Phys. Lett. A 22 （2007） 783, Gen. Relat. Gray. 39 （2007） 653], some properties of modified Chaplygin gas （MCG） as a dark energy model continue to be studied mainly in two aspects： ...Based our previous work [Mod. Phys. Lett. A 22 （2007） 783, Gen. Relat. Gray. 39 （2007） 653], some properties of modified Chaplygin gas （MCG） as a dark energy model continue to be studied mainly in two aspects： one is the change rates of the energy density and energy transfer, and the other is the evolution of the growth index. It is pointed that the density of dark energy undergoes the change from decrease to increase no matter whether the interaction between dark energy and dark matter exists or not, but the corresponding transformation points are different from each other.Eurthermore, it is stressed that the MCG model even supports the existence of interaction between dark energy and dark matter, and the energy of transfer flows from dark energy to dark matter. The evolution of the interaction term with an ansatz 3Hc^2ρ is discussed with the MCG model. Moreover, the evolution of the growth index f in the MCG model without interaction is illustrated, from which we find that the evolutionary trajectory of f overlaps with that of the ACDM model when a 〉 0.7 and its theoretical value f ≈ 0.566 given by us at z = 0.15 is consistent with the observations.展开更多
We study the energy level statistics of the SO(5) limit of super-symmetry U(6/4) in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution (NSD) and the spectral rigidity (...We study the energy level statistics of the SO(5) limit of super-symmetry U(6/4) in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution (NSD) and the spectral rigidity (△3)are investigated, and the factors that affect the properties of level statistics are also discussed. The results show that the boson number N is a dominant factor. If N is small, both the interaction strengths of subgroups SOB(5) and SOBF(5)and the spin play important roles in the energy level statistics, however, along with the increase of N, the statistics distribution would tend to be in Poisson form.展开更多
The littlest Higgs model with T-parity （LHT model） predicts the existence of the T-odd scalars （Φ^±, Φ^0, and Φ^P）. We consider the production of these new particles associated with T-odd gauge bosons at t...The littlest Higgs model with T-parity （LHT model） predicts the existence of the T-odd scalars （Φ^±, Φ^0, and Φ^P）. We consider the production of these new particles associated with T-odd gauge bosons at the Large Hadron Collider （LHC）. It is found that the partonic process qq^1 →Φ^＋ BH can generate a number of the characteristic signal events with a charged lepton and large missing energy at the LHC.展开更多
We consider the variable Generalized Chaplygin gas （VGCG） proposal for unification of dark matter and dark energy with p = pdc and ρ= pdm ＋ ρdc. The equation of state of the VGCG is given by p = -A0a^-n/ρ^α, wh...We consider the variable Generalized Chaplygin gas （VGCG） proposal for unification of dark matter and dark energy with p = pdc and ρ= pdm ＋ ρdc. The equation of state of the VGCG is given by p = -A0a^-n/ρ^α, where a is the scale factor. Some cosmological quantities such as the fractional contributions of different components of the universe Ωi （i respectively denotes baryons, dark matter and dark energy） to the critical density, the deceleration parameter q are all obtained. The transition from deceleration to acceleration is described in this model. In addition, we find the behaviour of variable Generalized Chaplgin gas is similar to dust-like matter at early times and will be quiessence or phantom at late stage.展开更多
Recently, the mixing of scalar mesons was introduced into the chiral SU（3） quark model and also dynamically applied to the baryon-baryon system. The results show that the nucleon-nucleon and hyperon-nucleon scatteri...Recently, the mixing of scalar mesons was introduced into the chiral SU（3） quark model and also dynamically applied to the baryon-baryon system. The results show that the nucleon-nucleon and hyperon-nucleon scattering data can be reasonably described for different mixing cases, one is ideal mixing and the other is θs= 19° mixing. In the present work, by taking the above parameters, the possible candidate of deltaron bound state is further predicted. We find that the contributions from σ and ε exchange to binding energy of deltaron are different, that the contribution from ε exchange is negligible, and that σ exchange is dominant. We also find that the binding energy of deltaron is very stable, around several tens of MeV, no matter what kind of mixing is adopted.展开更多
Pair production of the doubly charged leptons X±± via vector boson fusion （γγ, Zγ and WW） at the large hadron collider is studied. Our numerical results show that the cross section via Zγ fusion is ver...Pair production of the doubly charged leptons X±± via vector boson fusion （γγ, Zγ and WW） at the large hadron collider is studied. Our numerical results show that the cross section via Zγ fusion is very small. For the center-of-mass energy √s= 14 TeV and Mx = 200 650 GeV, the values of the cross sections σγγ and σww are in the ranges of 5.2 fb-0.04 fb and 20.2 fb 1.2 fb, respectively.展开更多
The Higgs triplet model （HTM） predicts the existence of a pair of doubly charged Higgs bosons H±±. Single production of H±± via e7 collision at the next generation e＋ e- International Linear Col...The Higgs triplet model （HTM） predicts the existence of a pair of doubly charged Higgs bosons H±±. Single production of H±± via e7 collision at the next generation e＋ e- International Linear Collider （ILC） and the Large Hadron electron Collider （LHeC） is considered. The numerical results show that the production cross sections are very sensitive to the neutrino oscillation parameters. Their values for the inverted hierarchy mass spectrum are larger than those for the normal hierarchy mass spectrum at these two kinds of collider experiments. With reasonable values of the relevant free parameters, the possible signals of the doubly charged Higgs bosons predicted by the HTM might be detected in future ILC experiments.展开更多
We consider single production of the heavy top quark T predicted by the three-site Higgsless model in future high energy collider experiments, such as the high energy linear e＋ e- collider （ILC）, the linear-ring ty...We consider single production of the heavy top quark T predicted by the three-site Higgsless model in future high energy collider experiments, such as the high energy linear e＋ e- collider （ILC）, the linear-ring type ep collider （THERA）, and the CERN Large Hadron Collider （LHC）. Our numerical results show that the possible signals of the heavy top quark T might be detected via the subproeess qb → q＇T at the LHC.展开更多
We investigate the modified Chaplygin gas （MCG） with interaction between holographic dark energy proposed by Li and dark matter. In this model, evolution of the universe is described in detail, which is from deceler...We investigate the modified Chaplygin gas （MCG） with interaction between holographic dark energy proposed by Li and dark matter. In this model, evolution of the universe is described in detail, which is from deceleration to acceleration. Specifically, the evolutions of related cosmological quantities such as density parameter, the equation of state of holographic dark energy, deceleration parameter and transition redshift are discussed. Moreover, we also give their present values which are consistent with the lately observations. Furthermore, the results given by us show such a model can accommodate a transition of the dark energy from a normal state wx 〉 -1 to ωx 〈 -1 phantom regimes.展开更多
The photon-induced processes at the LHC provide clean experimental conditions due to absence of theproton remnants,which might produce complementary and interesting results for tests of the standard model and forsearc...The photon-induced processes at the LHC provide clean experimental conditions due to absence of theproton remnants,which might produce complementary and interesting results for tests of the standard model and forsearching of new physics.In the context of the littlest Higgs model with T-parity,we consider the photon-inducedproduction of the mirror quarks at the LHC.The cross sections for various production channels are calculated and asimply phenomenological analysis is performed by assuming leptonic decays.展开更多
Previously, we extended our chiral SU（3） quark model to include the coupling between the quark and vector chiral fields [Nucl. Phys. A 727（2003）321]. Here we further study the structure of （ΩΩ）ST=oo dibaryon i...Previously, we extended our chiral SU（3） quark model to include the coupling between the quark and vector chiral fields [Nucl. Phys. A 727（2003）321]. Here we further study the structure of （ΩΩ）ST=oo dibaryon in the extended chiral SU（3） quark model by solving a resonating group method equation. The vector meson exchanges effect, hidden colour channel and colour screening effect are investigated, respectively. The results show that the （ΩΩ）ST=oo system is still the deeply bound state in the extended chiral SU（3） quark model in which the vector meson exchanges control the short-range quark-quark interaction, which is similar to the results obtained from the chiral SU（3） quark model. When the model space is enlarged by including the hidden colour channel, it is found that the energy of the hidden colour state ｜CC〉str=-6,ST=oo is much higher than that of the （ΩΩ）ST=oo state, thus the CC channel has little effect on the binding energy of （ΩΩ）ST=oo state. When the error function confinement potential is considered, the bound state property would not change largely. Fhrther, scalar meson mixing is considered. No matter whether θs= -18° or ideal mixing is taken, （ΩΩ）ST=oo state is still a bound state.展开更多
Whether the mixing of scalar meson exists or not is an interesting question. We consider the mixing of scalar meson and further study the nucleon-nucleon interaction in the chiral SU（3） quark model by solving the re...Whether the mixing of scalar meson exists or not is an interesting question. We consider the mixing of scalar meson and further study the nucleon-nucleon interaction in the chiral SU（3） quark model by solving the resonating group method equation. The results are analyzed and compared with no mixing, ideal mixing and general mixing. It seems that the nucleon-nucleon interaction and binding energy of deuteron can be reasonably described with the different mixing of scalar meson.展开更多
The SU(3)quadrupole-quadrupole interaction is replaced by the SO(6)cubic[Q_((0))×Q_((0))×Q_((0))]^(0)interaction in fitting energy levels,some energy ratios and B(E2)ratios.It is shown that the alternative s...The SU(3)quadrupole-quadrupole interaction is replaced by the SO(6)cubic[Q_((0))×Q_((0))×Q_((0))]^(0)interaction in fitting energy levels,some energy ratios and B(E2)ratios.It is shown that the alternative scheme can indeed be used to describe properties of the X(5)nuclei,for example,^(150)Nd,^(152)Sm,^(154)Gd.The results of the new scheme are compared with the corresponding experimental data and with those of the traditional U(5)-SU(3)transitional description.It is clearly shown that the results are better than those obtained from the traditional U(5)-SU(3)transitional description.展开更多
The prolate-oblate shape phase transition in the interacting boson model is investigated for finite N as well as in the large-N classical limit by adopting the Hamiltonian with a linear dependence on the control param...The prolate-oblate shape phase transition in the interacting boson model is investigated for finite N as well as in the large-N classical limit by adopting the Hamiltonian with a linear dependence on the control parameter.The results indicate that the critical dynamics in the new scheme is of theγ-soft type similar to the O(6)dynamics.It is also shown that the structural evolution in the Hf-Hg mass region can be well reproduced in the present scheme.展开更多
The generalized two-parametric Hilbert-Palatini action is constructed,which not only includes the well-known Hilbert-Palatini and Ashtekar gravitational theory as special cases,but also gives new results.In Hamiltonia...The generalized two-parametric Hilbert-Palatini action is constructed,which not only includes the well-known Hilbert-Palatini and Ashtekar gravitational theory as special cases,but also gives new results.In Hamiltonian formulation,the phase space variables and the corresponding Hamiltonian constraints can be obtained,including the Ashtekar and Barbero type constraints.Moreover,the results of this action are the same as those given by the parametric canonical transformations,although these two methods are completely different.展开更多
The Dyson form of the q-deformed boson realization of the quantum group SU(2)_(q) is constructed.The unitary Holstein-Primakoff representation of SU(2)_(q) is obtained from non-unitary Dyson representation by means of...The Dyson form of the q-deformed boson realization of the quantum group SU(2)_(q) is constructed.The unitary Holstein-Primakoff representation of SU(2)_(q) is obtained from non-unitary Dyson representation by means of K-matrix technique.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.12275115 and 12175097)the Educational Department of Liaoning Province(No.LJKMZ20221410).
文摘In this article,a comprehensive study of the fission process of Th,U,Pu,and Cm isotopes using a Yukawa-folded meanfield plus standard pairing model is presented.The study focused on analyzing the effects of the pairing interaction on the fragment mass distribution and its dependence on nuclear elongation.The significant role of pairing interactions in the fragment mass distributions of^(230)Th,^(234)U,^(240)Pu,and^(246)Cm was demonstrated.Numerical analysis revealed that increasing the pairing interaction strength decreased the asymmetric fragment mass distribution and increased the symmetric distribution.Furthermore,the odd-even mass differences at symmetric and asymmetric fission points were examined,highlighting their sensitivity to changes in the pairing interaction strength.Systematic analysis of the Th,U,Pu,and Cm isotope fragment mass distributions demonstrated the effectiveness of the model in reproducing the experimental data.In addition,the effects of the zero-point energy and half-width parameter on the fragment mass distribution for^(240)Pu were explored.Thus,this study provides valuable insights into the fission process by emphasizing the importance of pairing interactions and their relationship with nuclear elongation.
基金Supported by the National Natural Science Foundation of China under Grant No 10475037, and the Programme for New Century Excellent Talents in University （NCET-04-0290）.
文摘Based on the littlest Higgs model, we investigate the spin correlation of the top quark pair production via the process e^＋e^- →tt at the high energy linear e^＋e^- collider （ILC） with a centre-of-mass energy √S = 800 GeV. Our numerical results show that the gauge boson ZH generates very small corrections to the spin correlation observable C in all the parameter space allowed by the electroweak data. However, with reasonable values of the free parameters, the value of the relative correction parameter RBH = （CBH-CSM）/CSM can reach 10%, which might be detected in future ILC experiments.
基金Supported by the National Natural Science Foundation of China under Grant No 10475036, and the Scientific Research Foundation of the Higher Education Institute of Liaoning Province under Grant No 05L215.
文摘The dynamical attractor of the modified Chaplygin gas （MCG） model is studied. The dynamical analysis indicates that the phase ωMCG = -1 is a dynamical attractor and the equation of state of the MCG approaches it from either ωMCG 〉 -1 or ωMCG 〈 -1, independent of the choice of its initial density parameter and the ratio of pressure to critical energy density. Therefore our universe will not end up with Big Rip in the future. Moreover, the evolutions of the density parameters Ωγ and ΩMCG are quite different. For different initial values of x and y, Ωγ decreases and ΩMCG increases as time increases, and they will eventually approach Ωe = 0 and ΩMCG = 1, i.e., de Sitter phase. This implies that when there is not the interaction （i.e., the energy transfer） between the barotropic background fluid and modified Chaplygin gas （MCG）, the behaviour of the MCG will be similar to ACDM in the future.
基金Supported by the National Natural Science Foundation of China under Grant No 10875056, and the Scientific Research Foundation of the Higher Education Institute of Liaoning Province under Grant Nos 2007T087 and 05L215.
文摘For the variable generalized Chaplygin gas （VGCG） as a dynamical system, its stability is analyzed and the related dynamical attractors are investigated. By analysis it is shown that there are two critical points corresponding to the matter-dominated phase and the VGCG dark energy-dominated phase, respectively. Moreover, when the parameters n, a and γ take some fixed values, the phase with ωVGCG = --0.92 is a dynamical attractor and the equation of state of VGCG reaches it from either ωVGCG 〉 --1 or ωVGCG 〈 --1, independent of the initial values of the dynamical system. This shows a satisfactory cosmological model： the early matter-dominated era, followed by the dark energy-dominated era. Meanwhile, the evolutions of density parameters Ωγ and ΩVGCG are quite different from each other. For different initial values of x and y, Ωγ decreases and ωVGCG increases as the time grows, they will eventually approach Ωγ = 0 and ωVGCG ---- 1. Furthermore, since different values of n or a may lead to different equation-of-state parameters ωVGCG, we also discuss the constraints on the parameters n and by the observation data.
基金Supported by National Natural Science Foundation of China under Grant No 10475036, and the Scientific Research Foundation of the Higher Education Institute of Liaoning Province under Grant No 05L215.
文摘Based our previous work [Mod. Phys. Lett. A 22 （2007） 783, Gen. Relat. Gray. 39 （2007） 653], some properties of modified Chaplygin gas （MCG） as a dark energy model continue to be studied mainly in two aspects： one is the change rates of the energy density and energy transfer, and the other is the evolution of the growth index. It is pointed that the density of dark energy undergoes the change from decrease to increase no matter whether the interaction between dark energy and dark matter exists or not, but the corresponding transformation points are different from each other.Eurthermore, it is stressed that the MCG model even supports the existence of interaction between dark energy and dark matter, and the energy of transfer flows from dark energy to dark matter. The evolution of the interaction term with an ansatz 3Hc^2ρ is discussed with the MCG model. Moreover, the evolution of the growth index f in the MCG model without interaction is illustrated, from which we find that the evolutionary trajectory of f overlaps with that of the ACDM model when a 〉 0.7 and its theoretical value f ≈ 0.566 given by us at z = 0.15 is consistent with the observations.
文摘We study the energy level statistics of the SO(5) limit of super-symmetry U(6/4) in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution (NSD) and the spectral rigidity (△3)are investigated, and the factors that affect the properties of level statistics are also discussed. The results show that the boson number N is a dominant factor. If N is small, both the interaction strengths of subgroups SOB(5) and SOBF(5)and the spin play important roles in the energy level statistics, however, along with the increase of N, the statistics distribution would tend to be in Poisson form.
基金Supported by the Programme for New Century Excellent Talents in University （NCET-04-0290）, and the National Natural Science Foundation of China under the Grants No 10675057.
文摘The littlest Higgs model with T-parity （LHT model） predicts the existence of the T-odd scalars （Φ^±, Φ^0, and Φ^P）. We consider the production of these new particles associated with T-odd gauge bosons at the Large Hadron Collider （LHC）. It is found that the partonic process qq^1 →Φ^＋ BH can generate a number of the characteristic signal events with a charged lepton and large missing energy at the LHC.
基金Supported by the National Natural Science Foundation of China under Grant No 10475036, and the Scientific Research Foundation of the Higher Education Institute of Liaoning Province under Grant No 05L215.
文摘We consider the variable Generalized Chaplygin gas （VGCG） proposal for unification of dark matter and dark energy with p = pdc and ρ= pdm ＋ ρdc. The equation of state of the VGCG is given by p = -A0a^-n/ρ^α, where a is the scale factor. Some cosmological quantities such as the fractional contributions of different components of the universe Ωi （i respectively denotes baryons, dark matter and dark energy） to the critical density, the deceleration parameter q are all obtained. The transition from deceleration to acceleration is described in this model. In addition, we find the behaviour of variable Generalized Chaplgin gas is similar to dust-like matter at early times and will be quiessence or phantom at late stage.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11375080 and 10975068, and the Natural Science Foundation of Liaoning Scientific Committee under Grant No 2013020091.
文摘Recently, the mixing of scalar mesons was introduced into the chiral SU（3） quark model and also dynamically applied to the baryon-baryon system. The results show that the nucleon-nucleon and hyperon-nucleon scattering data can be reasonably described for different mixing cases, one is ideal mixing and the other is θs= 19° mixing. In the present work, by taking the above parameters, the possible candidate of deltaron bound state is further predicted. We find that the contributions from σ and ε exchange to binding energy of deltaron are different, that the contribution from ε exchange is negligible, and that σ exchange is dominant. We also find that the binding energy of deltaron is very stable, around several tens of MeV, no matter what kind of mixing is adopted.
基金Supported by the National Natural Science Foundation of China under Grant No 11275088, the Natural Science Foundation of the Liaoning Scientific Committee under Grant No 201102114, and the Foundation of Liaoning Educational Committee under Grant No LT2011015.
文摘Pair production of the doubly charged leptons X±± via vector boson fusion （γγ, Zγ and WW） at the large hadron collider is studied. Our numerical results show that the cross section via Zγ fusion is very small. For the center-of-mass energy √s= 14 TeV and Mx = 200 650 GeV, the values of the cross sections σγγ and σww are in the ranges of 5.2 fb-0.04 fb and 20.2 fb 1.2 fb, respectively.
基金Supported by the National Natural Science Foundation of China under Grant No.10975067the Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP) under Grant No.200801650002
文摘The Higgs triplet model （HTM） predicts the existence of a pair of doubly charged Higgs bosons H±±. Single production of H±± via e7 collision at the next generation e＋ e- International Linear Collider （ILC） and the Large Hadron electron Collider （LHeC） is considered. The numerical results show that the production cross sections are very sensitive to the neutrino oscillation parameters. Their values for the inverted hierarchy mass spectrum are larger than those for the normal hierarchy mass spectrum at these two kinds of collider experiments. With reasonable values of the relevant free parameters, the possible signals of the doubly charged Higgs bosons predicted by the HTM might be detected in future ILC experiments.
基金Supported in part by the National Natural Science Foundation of China under Qrants No 10675057, and Foundation of Liaoning Educational Committee （2007T086）.
文摘We consider single production of the heavy top quark T predicted by the three-site Higgsless model in future high energy collider experiments, such as the high energy linear e＋ e- collider （ILC）, the linear-ring type ep collider （THERA）, and the CERN Large Hadron Collider （LHC）. Our numerical results show that the possible signals of the heavy top quark T might be detected via the subproeess qb → q＇T at the LHC.
基金Supported by the National Natural Science Foundation of China under Grant No 10475036, and the Scientific Research Foundation of the Higher Education Institute of Liaoning Province under Grant Nos 05L215 and 2007T087.
文摘We investigate the modified Chaplygin gas （MCG） with interaction between holographic dark energy proposed by Li and dark matter. In this model, evolution of the universe is described in detail, which is from deceleration to acceleration. Specifically, the evolutions of related cosmological quantities such as density parameter, the equation of state of holographic dark energy, deceleration parameter and transition redshift are discussed. Moreover, we also give their present values which are consistent with the lately observations. Furthermore, the results given by us show such a model can accommodate a transition of the dark energy from a normal state wx 〉 -1 to ωx 〈 -1 phantom regimes.
基金Supported in part by the National Natural Science Foundation of China under Grant No.10675057the Natural Science Foundation of the Liaoning Scientific Committee under Grant No.20082148Foundation of Liaoning Educational Committee under Grant No.2007T086
文摘The photon-induced processes at the LHC provide clean experimental conditions due to absence of theproton remnants,which might produce complementary and interesting results for tests of the standard model and forsearching of new physics.In the context of the littlest Higgs model with T-parity,we consider the photon-inducedproduction of the mirror quarks at the LHC.The cross sections for various production channels are calculated and asimply phenomenological analysis is performed by assuming leptonic decays.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10675058 and 10475087.
文摘Previously, we extended our chiral SU（3） quark model to include the coupling between the quark and vector chiral fields [Nucl. Phys. A 727（2003）321]. Here we further study the structure of （ΩΩ）ST=oo dibaryon in the extended chiral SU（3） quark model by solving a resonating group method equation. The vector meson exchanges effect, hidden colour channel and colour screening effect are investigated, respectively. The results show that the （ΩΩ）ST=oo system is still the deeply bound state in the extended chiral SU（3） quark model in which the vector meson exchanges control the short-range quark-quark interaction, which is similar to the results obtained from the chiral SU（3） quark model. When the model space is enlarged by including the hidden colour channel, it is found that the energy of the hidden colour state ｜CC〉str=-6,ST=oo is much higher than that of the （ΩΩ）ST=oo state, thus the CC channel has little effect on the binding energy of （ΩΩ）ST=oo state. When the error function confinement potential is considered, the bound state property would not change largely. Fhrther, scalar meson mixing is considered. No matter whether θs= -18° or ideal mixing is taken, （ΩΩ）ST=oo state is still a bound state.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos 10975068 and 10675058, and the Scientific Research Foundation of Liaoning Education Department （2009T055）
文摘Whether the mixing of scalar meson exists or not is an interesting question. We consider the mixing of scalar meson and further study the nucleon-nucleon interaction in the chiral SU（3） quark model by solving the resonating group method equation. The results are analyzed and compared with no mixing, ideal mixing and general mixing. It seems that the nucleon-nucleon interaction and binding energy of deuteron can be reasonably described with the different mixing of scalar meson.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos 10975068 and 10775064in part by Scientific Research Foundation of Liaoning Education Department under Grant Nos 2009T055 and 2007R28.
文摘The SU(3)quadrupole-quadrupole interaction is replaced by the SO(6)cubic[Q_((0))×Q_((0))×Q_((0))]^(0)interaction in fitting energy levels,some energy ratios and B(E2)ratios.It is shown that the alternative scheme can indeed be used to describe properties of the X(5)nuclei,for example,^(150)Nd,^(152)Sm,^(154)Gd.The results of the new scheme are compared with the corresponding experimental data and with those of the traditional U(5)-SU(3)transitional description.It is clearly shown that the results are better than those obtained from the traditional U(5)-SU(3)transitional description.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11005056 and 11375005.
文摘The prolate-oblate shape phase transition in the interacting boson model is investigated for finite N as well as in the large-N classical limit by adopting the Hamiltonian with a linear dependence on the control parameter.The results indicate that the critical dynamics in the new scheme is of theγ-soft type similar to the O(6)dynamics.It is also shown that the structural evolution in the Hf-Hg mass region can be well reproduced in the present scheme.
基金Supported by Natural Science Foundation of Liaoning Province Educational Department of China under Grant No.20041012the National Natural Science Foundation of China under Grant No.19875023.
文摘The generalized two-parametric Hilbert-Palatini action is constructed,which not only includes the well-known Hilbert-Palatini and Ashtekar gravitational theory as special cases,but also gives new results.In Hamiltonian formulation,the phase space variables and the corresponding Hamiltonian constraints can be obtained,including the Ashtekar and Barbero type constraints.Moreover,the results of this action are the same as those given by the parametric canonical transformations,although these two methods are completely different.
文摘The Dyson form of the q-deformed boson realization of the quantum group SU(2)_(q) is constructed.The unitary Holstein-Primakoff representation of SU(2)_(q) is obtained from non-unitary Dyson representation by means of K-matrix technique.
