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Search Results: 1 - 10 of 55885 matches for " Qin Yong-Liang "
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Strong and Electromagnetic Decays of X(1835) as a Baryonium State
Ma, Yong-Liang
High Energy Physics - Phenomenology , 2008, DOI: 10.1088/0954-3899/36/5/055004
Abstract: With the assumption that the recently observed X(1835) is a baryonium state we have studied the strong decays of $X(1835) \to \eta^{(\prime)} \pi^+ \pi^-, \eta^{(\prime)} \pi^0 \pi^0$ and the electromagnetic decay of $X(1835) \to 2\gamma$ in the framework of effective Lagrangian formalism. In the present investigation we have included the contributions from the iso-singlet light scalar resonances but we have not included the isospin violating effect. Our result for the strong decay of $X(1835) \to \eta^{\prime} \pi^+ \pi^-$ is smaller than the observed data. The decay width for the radiative decay of $X(1835) \to 2\gamma$ is consistent with the assumption that it decays through the glueball. In addition, the width for the strong decay of $X(1835) \to \eta \pi^+ \pi^-$ is larger than that of the strong decay of $X(1835) \to \eta^{\prime} \pi^+ \pi^-$ due to the large phase space and coupling constant $g_{N\bar{N}\eta}$. From our investigation, it is not possible to interpret X(1835) as a baryonium.
Dense baryonic matter in the hidden local symmetry approach
Yong-Liang Ma
Physics , 2014,
Abstract: The dense baryonic matter and hadron properties in medium were simulated by using a Skyrme model including the ground state vector mesons introduced from the hidden local symmetry approach up to the next to leading order. We found that both the $\rho$ and $\omega$ mesons affect the baryonic matter and medium modified hadron properties dramatically. The most remarkable observation is that, the pion decay constant and the nucleon mass have the similar density dependence which agrees with the large $N_c$ argument. Explicitly, they drop with increasing density in the Skyrmion phase and stop decreasing at $n_{1/2}^{}$ at which the skyrmions in medium fractionize into half-skyrmions and remains nearly constants in the half-skyrmion phase. This density dependence in the half-skyrmion phase indicates that, although $\langle \bar{q}q\rangle \neq 0$ on average in this phase, chiral symmetry is not restored since hadrons are still massive and there exist pions. In addition, the nearly constant nucleon mass means that it could has a non-vanishing component up to the chiral transition, which might shed light on the origin of the nucleon mass.
Estimates for X(4350) Decays from the Effective Lagrangian Approach
Yong-Liang Ma
Physics , 2010, DOI: 10.1103/PhysRevD.82.015013
Abstract: The strong and electromagnetic decays of $X(4350)$ with quantum numbers $J^P =0^{++}$ and $2^{++}$ have been studied by using the effective Lagrangian approach. The coupling constant between $X(4350)$ and $D_s^{\ast}D_{s0}^{\ast}$ is determined with the help of the compositeness condition which means that $X(4350)$ is a bound state of $D_s^{\ast}D_{s0}^{\ast}$. Other coupling constants applied in the calculation are determined phenomenologically. Our numerical results show that, using the present data within the present model, the possibility that $X(4350)$ is a $D_s^{\ast}D_{s0}^{\ast}$ molecule can not be ruled out.
Simulation on effect of poloidal power spectrum on lower hybrid wave propagation

Qin Yong-Liang,Ding Bo-Jiang,Kuang Guang-Li,Jia Hua,Zhang Li-Zhi,

中国物理 B , 2010,
Abstract: The coupling of lower hybrid wave to the plasma is a crucial issue for efficient current drive in tokamaks. This paper establishes a new coupling model which assumes the antenna to be a curved face and the plasma to be a cylinder. Power spectrum considering the coupling between wave-guides in both poloidal and toroidal direction is simply estimated and discussed. The effect of the poloidal wave vector on wave propagation, power deposition and driven current is also investigated with the help of lower hybrid current drive code. Results show that the poloidal wave vector affects the ray tracing, and also has effect on power deposition and driven current. The effect of the poloidal wave vector on power deposition and driven current profile depends on plasma parameters. Preliminary studies suggest that it seems possible to control the current profile by adjusting the poloidal phase difference between the waveguide in poloidal direction.
RAMAN SCATTERING INTENSITIES OF FOLDED LONGITUDINAL ACOUSTIC PHONONS IN GexSi1-x/Si SUPERLATTICES

JIN YING,ZHANG SHU-LIN,QIN GUO-GANG,FAN YONG-LIANG,ZHOU GOU-LIANG,YU MING-REN,

中国物理 B , 1992,
Abstract:
Hypoxia-mimetic agents inhibit proliferation and alter the morphology of human umbilical cord-derived mesenchymal stem cells
Hui-Lan Zeng, Qi Zhong, Yong-Liang Qin, Qian-Qian Bu, Xin-Ai Han, Hai-Tao Jia, Hong-Wei Liu
BMC Cell Biology , 2011, DOI: 10.1186/1471-2121-12-32
Abstract: After treatment with DFO and CoCl2, hMSCs were elongated, and adjacent cells were no longer in close contact. In addition, vacuole-like structures were observed within the cytoplasm; the rough endoplasmic reticulum expanded, and expanded ridges were observed in mitochondria. In addition, DFO and CoCl2 treatments for 48 h significantly inhibited hMSCs proliferation in a concentration-dependent manner (P < 0.05). This treatment also increased the number of cells in G0/G1 phase and decreased those in G2/S/M phase.The hypoxia-mimetic agents, DFO and CoCl2, alter umbilical cord-derived hMSCs morphology and inhibit their proliferation through influencing the cell cycle.Human mesenchymal stem cells (hMSCs) were first identified by Friedenstein et al. [1] in 1974. As non-hematopoetic, multipotent bone marrow stem cells, hMSCs are more primitive and embryonic-like cells with the potential to differentiate into lineage-committed progenitors and mature cells, such as osteoblasts and fibroblasts [2]. However, bone marrow is not the exclusive source of MSCs; they have been isolated from virtually all post-natal and extra-embryonic tissues, including amniotic membrane, placenta, umbilical cord, and umbilical cord blood [3-5]. In recent years, hMSCs have been commonly used in tissue engineering, cell replacement therapy, gene therapy, and body organ/fluid transplantation.Oxygen is a potent signaling molecule, affecting the fundamental characteristics of various types of cells. Specifically, reduced oxygen levels or hypoxia influences blood-brain barrier permeability through influencing endothelial cell junctional complexes [6]. Furthermore, hypoxia induced proliferation of hematopoietic bone marrow stem cells [7]. In addition, hypoxia-inducible factor-1 alpha (HIF-1α), a critical transcription factor in the mammalian oxygen-sensing pathway, is activated in response to hypoxia, altering tumor xenograft gene expression, growth, and angiogenesis [8] possibly through membrane type 1 m
Doubly heavy baryons with chiral partner structure
Yong-Liang Ma,Masayasu Harada
Physics , 2015, DOI: 10.1016/j.physletb.2015.07.046
Abstract: The spectrum and dominant strong decay properties of the doubly heavy baryons are revisited by using a chiral effective model with chiral partner structure. By regarding the doubly heavy baryons in the ground states and light angular momentum $j_l = 1/2$ sector of the first orbitally excited states as chiral partners to each other, we estimate the mass splitting of the chiral partners which arises from the spontaneous breaking of chiral symmetry to be about $430$ MeV for baryons including an unflavored light quark and about $350$ MeV for that including a strange quark. We point out that, similar to the heavy-light meson sector, the intermultiplet decay from a baryon with negative parity to its chiral partner and a pion is determined by the mass splitting throught the generalized Goldberger-Treiman relation. Furthermore, the isospin violating decay of $\Omega_{cc}$ baryon, $((1/2)^-, (3/2)^-)_s \to ((1/2)^+, (3/2)^+)_s + \pi^0$ through the $\eta$-$\pi^0$ mixing is the dominant decay channel of the doubly heavy baryons including a strange quark.
Strong and radiative decays of X(3872) as a hadronic molecule with a negative parity
Masayasu Harada,Yong-Liang Ma
Physics , 2010, DOI: 10.1143/PTP.126.91
Abstract: Properties of X(3872) are studied by regarding it as a $DD^{\ast}$ hadronic molecule with $J^{PC} = 2^{-+}$ in the phenomenological Lagrangian approach. We find that our model with about 97.6% isospin zero component explains the existing data nicely, for example, the ratio $\mathcal{B}(X(3872) \to J/\psi\pi^+\pi^-\pi^0)/\mathcal{B}(X(3872) \to J/\psi\pi^+\pi^-)$. We predict the partial widths of the radiative decays of $X(3872) \to \gamma J/\psi$, $\gamma \psi(2S) $ and the strong decays of $X(3872) \to J/\psi \pi^+ \pi^-$, $J/\psi \pi^+\pi^-\pi^0$ as well as $X(3872) \to \chi_{cJ}\pi^0$. Our analysis shows that the measurement of the ratio $\mathcal{B}(X(3872) \to \chi_{c0}\pi^0)/\mathcal{B}(X(3872) \to \chi_{c1}\pi^0)$ may signal the nature of X(3872).
Degeneracy of doubly heavy baryons from heavy quark symmetry
Yong-Liang Ma,Masayasu Harada
Physics , 2015,
Abstract: The spectroscopy of the doubly heavy baryons including different heavy quarks is studied based on the heavy quark symmetry of QCD. We point out that, when the two heavy quarks are in $S$-wave, these baryons with a certain spin $j_l$ of the light cloud can be classified into two sets: a heavy quark singlet with total spin of $j=j_l$ and a heavy quark multiplet with $j= (j_l+1) , j_l ,\ldots \vert j_l-1\vert$, all the baryons in these two sets have the same mass and, the baryons with the same quantum numbers in these two sets do not mix with each other. We finally point out that the strong decay of the first excited baryon with light spin $j_l = 1/2$ to the ground state and one-pion is determined by the mass splitting through the generalized Goldberger--Treiman relation.
The critical group of $C_4\times C_n$
Jian Wang,Yong-Liang Pan
Mathematics , 2009,
Abstract: In this paper, the critical group structure of the Cartesian product graph $C_4\times C_n$ is determined, where $n\ge 3$.
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