118358375
Possibly stable configurations of Theta+(5) in the flux-tube model
In this work, following the literature, we investigate the semi-classical picture where various spatial configurations for $\Theta^+_5$ were suggested by several authors. We use the flux tube model where the effective Column coefficient and string tension are extracted from the lattice QCD calculations, to obtain the interactions among the constituent quarks, which is later to be taken as an effective potential. It is reasonable to assume that keeping the simple spatial shape, only the breathing mode is considered, thus the whole system is much simplified and described by only one variable. Substituting the potential into the Schr\"odinger equation, we evaluate the binding energy of the system. We find that each of the configuration has higher symmetries and corresponds to a local minimum of energy and one of them results in a mass which is smaller than the others. It is interesting to notice that with such a very simplified semi-classical picture the minimal value corresponds to a mass of 1530 to 1554 MeV for $\Theta^+_5$. The good agreement with the LEPS' data may indicate that such simplified picture indeed reflects physical reality in some sense.
124890684
Revisiting the spectrum of baryonium in heavy baryon chiral perturbation theory
In the framework of the heavy baryon perturbation theory, in which the two-pion exchange is considered, the physical properties of heavy baryon and anti-heavy baryon systems are revisited. The potentials between heavy baryon and anti-heavy baryon are extracted in a holonomic form. Based on the extracted potentials, the S-wave scattering phase shifts and scattering lengths of Lambda(c)-(Lambda(c)) over bar and Sigma(c)-(Sigma(c)) over bar are calculated. From these scattering features, it is found that the Lambda(c)-(Lambda(c)) over bar system can be bound only when the value of the coupling constant at the baryon-Goldstone-boson vertex is larger than that calculated from the decay data of the Sigma(c)(Sigma c*) -> Lambda(c)pi process. The binding condition for the Sigma(c)-(Sigma(c)) over bar system is also examined. The binding possibilities of these systems deduced from the scattering calculations are also checked by the bound state calculation and the binding energies are obtained if the system can be really bound. The binding possibility of the Lambda(b)-(Lambda) over barb system is investigated as well.
123139541
Possible heavy dibaryons
In the framework of the constituent quark model, the possible S-wave heavy dibaryon states with the c flavor are investigated. The factors which are responsible for the binding behavior of the dibaryon system are analyzed. It is shown that both the symmetry character of the system and the energy of interactions between interacting quarks are important for the binding behavior of the two-baryon system with the heavy flavor. As a result, seven possible candidates of heavy dibaryons with c flavor are predicted.
120668951
SOME THEORETICAL ISSUES OF HADRON PRODUCTIONS AND PROPERTIES FROM J/ψ DECAYS
J/ψ strong decay is one of the best places to study the hadronic structure and the strong interaction. In this talk, as the background contribution, the proton pole diagram contribution to the branching ratio and the angular distribution in decays is analyzed. The applicability of quark models is explored via process. The structures of N*s, especially Roper resonance, are discussed by studying J/ψ decays. The productions of possible multi-quark systems via charmonium and bottomonium strong/radiative decays are also investigated.
119219351
Maximum Entropy Principle for Self-gravitating Perfect Fluid in Lovelock Gravity
We consider a static self-gravitating system consisting of perfect fluid with isometries of an $(n-2)$-dimensional maximally symmetric space in Lovelock gravity theory. A straightforward analysis of the time-time component of the equations of motion suggests a generalized mass function. Tolman-Oppenheimer-Volkoff like equation is obtained by using this mass function and gravitational equations. We investigate the maximum entropy principle in Lovelock gravity, and find that this Tolman-Oppenheimer-Volkoff equation can also be deduced from the so called "maximum entropy principle" which is originally customized for Einstein gravity theory. This investigation manifests a deep connection between gravity and thermodynamics in this generalized gravity theory.