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Holographic models of the scalar sector of QCD

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Chinese Physics C 2010年第9期34卷 1516-1519页

作者： Frédéric Jugeau tpcsf Institute of High Energy PhysicsChinese Academy of Sciences

We investigate the AdS/QCD duality for the two-point correlation functions of the lowest dimension scalar meson and scalar glueball operators,in the case of the Soft Wall holographic model of *** and decay constants as well as gluon condensates are compared to their QCD *** particular,the role of the boundary conditions for the bulk-to-boundary propagators is emphasized.

关键词： AdS/QCD correspondence holographic models of QCD hadron spectroscopy

Deuteron form factors in a phenomenological approach

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Chinese Physics C 2015年第10期39卷 55-60页

作者：梁翠英董宇兵 Institute of High Energy Physics Chinese Academy of Sciences Theoretical Physics Center for Science Facilities (tpcsf) CAS

The electromagnetic form factors of the deuteron, particularly its quadrupole form factor, are studied with the help of a phenomenological Lagrangian approach where the vertex of the deuteron proton-neutron with D-state contribution is explicitly taken into account. The results show the importance of this contribution to the deuteron quadrupole form factor in the approach.

关键词： electromagnetic properties of deuteron, quadrupole form factor effective Lagrangian approach

An estimate of two-photon exchange effect on deuteron electromagnetic form factors

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Chinese Physics C 2010年第9期34卷 1346-1349页

作者：董宇兵 Institute of High Energy Physics CAS Theoretical Physics Center for Science Facilities (tpcsf) CASChina

The effect of the two-photon exchange on the deuteron electromagnetic form factors is estimated based on an effective Lagrangian approach. A numerical estimate calculation of the effect is discussed. In particular, th... 详细信息

关键词： Delastic scattering two-photon-exchange deuteron electromagnetic form factors

A study of meson-meson potential in the chiral quark model

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Chinese Physics C 2011年第7期35卷 622-628页

作者：李明涛董宇兵张宗烨 Institute of High Energy Physics Chinese Academy of Sciences Theoretical Physics Center for Science Facilities (tpcsf) CAS

An effective potential in a meson-meson system is discussed based on the SU（3） chiral constituent quark model, and the analytic form of the potential is explicitly given. In addition, the effective potential is employed to study the bound state problem of ωφ, which is related to the new resonance of f0（1810） observed in BES Ⅱ very recently.

关键词： cluster model SU(3) chiral quark model molecule states meson-meson effective potential

A study of transverse charge density of pions in relativistic quantum mechanics

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Chinese Physics C 2011年第8期35卷 713-716页

作者：董宇兵王翼展 Institute of High Energy Physics Chinese Academy of Sciences Theoretical Physics Center for Science Facilities (tpcsf) CASChina

The transverse charge density of pions is calculated based on relativistic quantum mechanics, where the pion is regarded as a quark-antiquark bound state. Corrections from the two spin-1/2 constituents and from the wave function of a quark and antiquark inside the bound system are discussed. The calculated results are compared to the results with a realistic effective Lagrangian approach as well as to that with a simple covariant model where the pion is regarded as a composite system with two scalar particles.

关键词： transverse charge density pion compositeness condition relativistic quantum mechanics

DJpsiFDC:an event generator for the process gg→J/ψJ/ψ at the LHC

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Chinese Physics C 2011年第3期35卷 209-213页

作者：乔从丰王健郑阳恒 College of Physical Sciences Graduate University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities (tpcsf)

DJpsiFDC is an event generator package for the process gg → J/ψJ/ψ. It generates events for primary leading-order 2 → 2 processes. The package could generate a Les Houches Event （LHE） document and this could eas... 详细信息

关键词： event generator FDC J/ψ pair color-octet

Deuteron electromagnetic form factors with the light-front approach

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Chinese Physics C 2017年第1期41卷 51-59页

作者：孙保东董宇兵 Institute of High Energy Physics Beijing 100049 China Theoretical Physics Center for Science Facilities (tpcsf) CAS Beijing 100049 China

The electromagnetic form factors and low-energy observables of the deuteron are studied with the help of the light-front approach, where the deuteron is regarded as a weakly bound state of a proton and a neutron. Both the S and D wave interacting vertexes among the deuteron, proton, and neutron are taken into account. Moreover,the regularization functions are also introduced. In our calculations, the vertex and the regularization functions are employed to simulate the momentum distribution inside the deuteron. Our numerical results show that the lightfront approach can roughly reproduce the deuteron electromagnetic form factors, like charge G0, magnetic G1, and quadrupole G2, in the low Q~2 region. The important effect of the D wave vertex on G2is also addressed.

关键词： deuteron form factor light-front approach

Effect of Center-of-Mass Motion Removal in the Molecular Dynamics Simulations

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Chinese Physics Letters 2010年第8期27卷 114-116页

作者：万荣正李松焱方海平 Shanghai Institute of Applied Physics Chinese Academy of Sciences PO Box 800-204 Shanghai 201800 Theoretical Physics Center for Science Facilities (tpcsf) Chinese Academy of Sciences Beijing 100049

Molecule dynamics simulation is now widely used in the study of nano pores, proteins and nano-scale devices. The limited friction in such a system requires the method of center-of-mass motion removal to be applied. We test the effect of different time period T of this method under osmotic pressure difference, and find that the impact on the net flux is very small together with the effective reduction of the accumulated numerical error when the period T is above 0.1 ps. The simulation results also show that the change of this time period of method has very little effect on the potential of mean force of the water inside the carbon nanotubes.

关键词： Simulation Timing Time Periodicity Methods

Λ_c~* in a coupled-channel baryon-meson scattering

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Chinese Physics C 2011年第1期35卷 16-21页

作者：梁伟红邱玉凤胡建雄沈彭年 Department of physics Guangxi Normal University Theoretical Physics Center for Science Facilities (tpcsf) Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

Possible structures and properties of some excited states of ∧^＋c dynamically generated in the coupled-channel P-wave meson-baryon scattering are studied by solving the Bethe-Salpeter（BS） equation in the framework of the Chiral Unitary Approach. It is shown that both ∧^＋c（2765） and ∧^＋c（2940） could be generated dynamically and could be compound states with multi-configuration molecular-like structures. The couplings of the generated states to various reaction channels are also calculated. Moreover, two highly excited states, ∧^＋c（3024） and ∧^＋c（3134）, are predicted.

关键词： charmed baryon multi-channel scattering chiral unitary approach