14177196
The Layer Phase in the Non-isotropic SU(3) Gauge Model at Finite Temperature
The phase structure of a non-isotropic non-Abelian SU(3) lattice gauge model at finite temperature is investigated to the third order in the variational-cumulant expansion (VCE) approach. The layer phase exists in this model in the cases of dimensions D=4, D=5 (d=D-1).
116999054
Study of singlet-triplet mixing via semileptonic decays
The singlet-triplet mixing of 1P1–3P1 is studied via calculating the branching ratios of semileptonic decay Bs → Ds1lν and B → D1lν by means of the instantaneous Bethe-Salpeter method. Special attention is paid to the relativistic corrections, since they are large for the P-wave states. Using the Mandelstam Formalism, we compute the transition form factors not only in the high-energy lepton end-point region but also in the full Q2 region. In addition, the non-perturbative QCD effects are taken care of in the overlapping integral over the relativistic wave functions of the initial and final states.
119236706
Semi-Leptonic and Non-Leptonic B Meson Decays to Charmed Mesons
We study the semi-leptonic and non-leptonic B weak decays that are governed by the B → D(*) transitions. The branching ratios, CP asymmetries (CPAs) and polarization fractions of non-leptonic decays are investigated in the factorization approximation (FA). The B → D(*) form factors are estimated in the Salpeter method. Our estimation on branching ratios is in general agreement with existing experimental data. For CPAs and polarizations, comparisons among the FA results, the perturbative QCD predictions and experimental data are presented.
121511104
Instantaneous Formulation for Transitions Between Two Instantaneous Bound States and Its Gauge Invariance
We have precisely derived a ``rigorous instantaneous formulation" for transitions between two bound states when the bound states are well-described by instantaneous Bethe–Salpeter (BS) equation (i.e. the kernel of the equation is instantaneous ``occasionally"). The obtained rigorous instantaneous formulation, in fact, is expressed as an operator sandwiched by two ``reduced BS wave functions" properly, while the reduced BS wave functions appearing in the formulation are the rigorous solutions of the instantaneous BS equation, and they may relate to Schrodinger wave functions straightforwardly. We also show that the rigorous instantaneous formulation is gauge-invariant with respect to the Uem(1) transformation precisely, if the concerned transitions are radiative. Some applications of the formulation are outlined.
123969406
Semileptonic Production of Scalar and Tensor p-Wave Charmed Mesons
With the same constituents of quark and antiquark, the p-wave state has a higher mass than the corresponding s-wave state, but the relativistic corrections are much larger in the processes of which p-wave mesons are involved. Considering this, the relativistic Bethe?Salpeter method is applied to estimate the branching fractions of semileptonic decays B(s) ? D*(sJ)l? (J = 0,2). Our predictions are Br[???(2317)l?]?=?0.50%, Br[???(2573)l?]?=?0.40%, Br[B????(2400)l?]?=?0.79%, Br[B????(2460)l?]?=?0.28%, Br[???(2400)l?]?=?0.58% and Br[???(2460)l?]?=?0.27%. .
119303730
Annihilation Rate of Heavy 0^{++} P-wave Quarkonium in Relativistic Salpeter Method
Abstract Two-photon and two-gluon annihilation rates of P-wave scalar charmonium and bottomonium up to third radial excited states are estimated in the relativistic Salpeter method. We solved the full Salpeter equation with a well defined relativistic wave function and calculated the transition amplitude using the Mandelstam formalism. Our model dependent estimates for the decay widths: Γ(χc0 → 2γ) = 3.78 keV, Γ(χ′c0 → 2γ) = 3.51 keV, Γ(χb0 → 2γ) = 48.8 eV and Γ(χ′b0 → 2γ) = 50.3 eV. We also give estimates of total widths by the two-gluon decay rates: Γtot(χc0) = 10.3 MeV, Γtot(χ ′ c0) = 9.61 MeV, Γtot(χb0) = 0.887 MeV and Γtot(χ ′ b0) = 0.914 MeV.
119956852
Energy quantization and intermittency in multiparticle production
We propose a simple model to describe the multiparticle production in high-energy hadronic interactions. As a result of energy quantization of the excitation system formed in collisions, the model naturally explains the intermittency phenomenon as well as other properties in multiparticle productions.
54192336
Proton-proton correlations in central collisions of Ni + Ni at 1.93 A.GeV and the space-time extent of the emission source
Small-angle correlations of proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 A · GeV are investigated with the FOPI detector system at GSI Darmstadt. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the source extension. The determination of the source rest frame is found essential for the identification of this effect. For the present system, the selection of central events comprising about 8% of the total cross section allows for the isolation of a compact source in momentum space which is centered around the c.m. velocity of the colliding nuclei. Taking into account the strong collective expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30%, r.m.s. radius and emission time parameters of Rrms=(4.2±1.2) fm and trms=(11+7-5) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function mixes the spatial and temporal size of the source and gives an upper limit Rrms=(7.0 ± 0.8) fm of the source radius.
118611881
A study on the relations between the topological parameter and entanglement
Abstract In this Letter, some relations between the topological parameter d and concurrences of the projective entangled states have been presented. It is shown that for the case with d = n , all the projective entangled states of two n -dimensional quantum systems are the maximally entangled states (i.e. C = 1 ). And for another case with d ≠ n , C both approach 0 when d → + ∞ for n = 2 and 3. Then we study the thermal entanglement and the entanglement sudden death (ESD) for a kind of Yang–Baxter Hamiltonian. It is found that the parameter d influences not only the critical temperature T c but also the maximum entanglement value that the system can arrive at. And we also find that the parameter d has a great influence on the ESD.
119185315
Effects of the detection efficiency on multiplicity distributions
In this paper we investigate how a finite detection efficiency affects three popular multiplicity distributions, namely the Poisson, the Binomial and the Negative Binomial distributions. We found that a multiplicity-independent detection efficiency does not change the characteristic of a distribution, while a multiplicity-dependent detection efficiency does. We layout a procedure to study the deviation of moments and their derivative quantities from the baseline distribution due to a multiplicity-dependent detection efficiency.
119941320
Probability description of final-state distribution in independent fragmentation model