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- Wu-Sheng Dai
- 2008

In this paper we show that for a non-ideal Bose gas there exists an upper limit on the transition temperature above which Bose-Einstein condensation cannot occur regardless of the pressure applied. Such upper limits for some realistic Bose gases are estimated. This result implies that there may also exist an upper limit on the transition temperature of… (More)

- Wu-Sheng Dai, Mi Xie
- 2003

This paper seeks to construct a representation of the algebra of angular momentum (SU(2) algebra) in terms of the operator relations corresponding to Gentile statistics in which one quantum state can be occupied by n particles. First, we present an operator realization of Gentile statistics. Then, we propose a representation of angular momenta. The result… (More)

- Wu-Sheng Dai, Xin-Heng Guo, Gang Zhao
- 1999

The difference of τ B and τ Λb indicates the role of the light flavors. We calculate the lifetimes of B-meson and Λb based on the weak effective Hamiltonian while assuming the heavy baryon is constructed by a heavy b-quark and a diquark containing two light quarks. In this scenario, we use the information of the measured ratio τ Λ b /τ B as input to predict… (More)

In the framework of QCD at finite temperature we have obtained dissipative terms for the effective potential between q and q̄ which would partly explain the J/ψ suppression in the Quark Gluon Plasma (QGP). The derivation of the dissipative potential for QGP is presented and the case for Hadron Matter (HM) is briefly discussed. The suppression effects are… (More)

- Wu-Sheng Dai
- 2003

In this paper, the effects of boundary and connectivity on ideal gases in two-dimensional confined space and three-dimensional tubes are discussed in detail based on the analytical result. The implication of such effects on the mesoscopic system is also revealed. PACS numbers: 05.30.-d, 68.65.-k

- Wu-Sheng Dai, Mi Xie
- Physical review. E, Statistical, nonlinear, and…
- 2004

In this paper we calculate some exact solutions of the grand partition functions for quantum gases in confined space, such as ideal gases in two- and three-dimensional boxes, in tubes, in annular containers, on the lateral surface of cylinders, and photon gases in three-dimensional boxes. Based on these exact solutions, which, of course, contain the… (More)

- Wu-Sheng Dai, Mi Xie
- 2009

The main aim of this paper is twofold: (1) revealing a relation between the counting function N (λ) (the number of the eigenstates with eigenvalue smaller than a given number) and the heat kernel K (t), which is still an open problem in mathematics, and (2) introducing an approach for the calculation of N (λ), for there is no effective method for… (More)

The light quarks inside B mesons are usually treated as spectators and do not affect the decay rates which are assumed to be purely due to b quark decays. In this paper we calculate the non-spectator contributions to inclusive charmless B decays due to the spectator effects. We find that the non-spectator contributions to the branching ratio for B̄ are… (More)

- Wu-Sheng Dai, Xin-Heng Guo, Hong-ying Jin
- 2000

The two heavy quarks in a baryon which contains two heavy quarks and a light one, can constitute a scalar or axial vector diquark. We study electromagnetic radiations of such baryons, (i) Ξ(bc)1 → Ξ(bc)0 + γ, (ii) Ξ∗(bc)1 → Ξ(bc)0 + γ, (iii) Ξ ∗∗ (bc)0 (1/2, l = 1) → Ξ(bc)0 + γ, (iv) Ξ∗∗ (bc)0(3/2, l = 1) → Ξ(bc)0 + γ and (v) Ξ ∗∗ (bc)0 (3/2, l = 2) →… (More)

In this paper, we show that there exists an essential difference of boundary effects between Bose and Fermi systems both for Dirichlet and Neumann boundary conditions: at low temperatures and high densities the influence of the boundary on the Bose system depends on the temperature but is independent of the density, but for the Fermi case the influence of… (More)