Charm hadron production at RHIC in combination model
We investigate the charm hadron production in relativistic heavy-ion collisions with the quark combination model. The $p_{T}$ dependencies of the charm baryon to meson ratios such as $\frac{\Lambda_{c}+\bar{\Lambda}_{c}}{D^{0}+\bar{D}^{0}}$, $\frac{\Lambda_{c}+\bar{\Lambda}_{c}}{D^{+}+D^{-}}$ and $\frac{\Lambda_{c}+\bar{\Lambda}_{c}}{D_{s}^{+}+D_{s}^{-}}$ in Au+Au collisions at 200 GeV are obtained. The charm baryon enhancement in the intermediate $p_{T}$ range is very prominent, which further, together with the strangeness enhancement, affect the charm hadron ratios and lead to a $\sim17%$ larger charm cross-section given by PHENIX. The dependencies of the charm hadron ratios on energy, centrality, and other parameters are also investigated. Predictions of the charm hadron ratios for the upgrade of RHIC and for LHC are presented.

title: Charged-particle rapidity density in Au+Au collisions in a quark combination model
abstract: Rapidity/pseudorapidity densities for charged particles and their centrality, rapidity, and energy dependence in Au+Au collisions at the Relativistic Heavy Ion Collider are studied in a quark combination model. Using a Gaussian-type rapidity distribution for constituent quarks as a result of Landau hydrodynamic evolution, the data at {radical}(s{sub NN})=130,200 GeV at various centralities in full pseudorapidity range are well described, and the charged-particle multiplicities are reproduced as functions of the number of participants. The energy dependence of the shape of the dN{sub ch}/d{eta} distribution is also described at various collision energies {radical}(s{sub NN})=200,130,62.4 GeV in central collisions with same value of parameters except 19.6 GeV. The calculated rapidity distributions and yields for the charged pions and kaons in central Au+Au collisions at {radical}(s{sub NN})=200 GeV are compared with experimental data of the BRAHMS Collaboration.

title: The nearest correlation in rapidity and the multiplicity distribution in e+e- annihilation
abstract: The authors discuss the combination rule of quarks controlled by the nearest correlation in rapidity. The average yields of mesons, baryons and the multiplicity spectra produced by stochastic accumulation of N pairs of quarks are given. Using the relation between the average yields of quark pairs and energy, which is in fact universal, they calculate the observed yields of meson, baryon and the multiplicity distribution in e+e- annihilation. Comparisons are made of their prediction with the experimental data and the negative binomial distribution.

title: Study of the color string configuration in a multiparton system.

title: Production rates for hadrons, pentaquarks Theta+ and Theta*++, and di-baryon (Omega Omega)(0+) in relativistic heavy ion collisions by a quark combination model
abstract: The hadron production in relativistic heavy ion collisions is well described by the quark combination model. The mixed ratios for various hadrons and the transverse momentum spectra for long-life hadrons are predicted and agree with recent RHIC data. The production rates for the pentaquarks $\Theta ^+$, $\Theta ^{*++}$ and the di-baryon $(\Omega\Omega)_{0^{+}}$ are estimated, neglecting the effect from the transition amplitude for constituent quarks to form an exotic state.

title: Inclusive production of meson resonances and the sea-quark distributions in the proton
abstract: We have extended the application of the recombination model to the production of meson resonances. The x distributions of mesons produced in the pp reactions, including resonances, were found to display certain simple relations, which are independent of specific assumptions about the sea-quark distributions. These predictions can be used both to examine the model and to differentiate between the distributions of strange and nonstrange seaquarks. In the smaller-x region the shapes of meson inclusive distributions sensitivity depend on the sea-quark distribution. Because in the pseudoscalar-meson case, that is just in the same region where contamination from the resonance decay is serious, we use resonance production to determine directly the sea-quark distributions. If we assume that the sea-quark distributions of all three flavors have the same x dependence, with only the normalization of the strange-quark distribution being suppressed, good agreement with the available data can be achieved. And, with the distribution of seaquarks known, the shape of the inclusive distribution for meson production can then be determined without any further adjustable parameters.

title: Studies of gamma gamma to Lambda anti-Lambda , Sigma0 anti-Sigma0 production at Belle

title: Improved measurements of anti-B0 ---> D+(sJ) K- decays

title: Measurement of the differential q**2 spectrum and forward-backward asymmetry for B ---> K* l+ l-

title: Measurement of masses and branching ratios of Xi(+)(c) and Xi(0)(c) baryons
abstract: Reference EPFL-ARTICLE-154475doi:10.1016/j.physletb.2004.11.038View record in Web of Science Record created on 2010-11-05, modified on 2017-05-12

title: Observation of a chi'(c2) candidate in gamma gamma ---> D anti-D production in Belle