共查询到20条相似文献,搜索用时 15 毫秒
1.
Possible existence of bound states of a charmed baryon, Λ c , Σ c , Σ* c with a nucleon, N, as well as two charmed baryons, Λ c Λ c , etc., are examined in the meson exchange potential approach. The heavy quark spin symmetry induces a strong tensor coupling between Λ c N, Σ c N and Σ* c N states, which causes a bound state of Λ c N (J = 0+ and 1+) states. Such a bound state is also seen in the spin-singlet Λ c Λ c channel, which resembles the H dibaryon in the strange sector. 相似文献
2.
C. G. Wohl 《The European Physical Journal C - Particles and Fields》2000,15(1-4):799-800
3.
We discuss the mass spectrum of doubly charmed mesons as hadronic molecules composed by D and D* meson. Considering the heavy quark symmetry and chiral symmetry, we introduce the one-boson ( ${\pi , \rho , \omega}$ ) exchange potential between D and D* meson. For all possible quantum numbers I(J P ) with isospin I, total angular momentum J( ≤ 2) and parity P, we solve the fully coupled channel Schrödinger equation. We find that in many quantum numbers the bound and resonant states composed by D or D* meson can exist near the DD, DD* and D*D* thresholds. 相似文献
4.
We predict the quantitative lifetime differences of weakly decaying charmed baryons which arise due to preasymptotic bound state effects. These predictions are to a large extent model independent. We also give and compare detailed quantitative estimates obtained in a nonrelativistic quark model and in a bag model. Finally, we show how the various nonspectator effects can be separated and determined phenomenologically, once the lifetime of charmed baryons are measured with sufficient accuracy. 相似文献
5.
Hai-Yang Cheng 《Frontiers of Physics》2015,10(6):101406
This is essentially an update of Ref. [1] [H. Y. Cheng, Int. J. Mod. Phys. A 24 (Suppl. 1), 593 (2009)], a review of charmed baryon physics around 2007. Topics covered in this review include the spectroscopy, strong decays, lifetimes, nonleptonic and semileptonic weak decays, and electromagnetic decays of charmed baryons. 相似文献
6.
We consider a three-phase model of strongly interacting matter, treating each phase as an ideal gas modified by a simple phenomenological interaction feature. For nuclear matter, we take into account the baryonic repulsion; for the quark-gluon plasma, we include the bag pressure; the constituent quark phase has a non-zero effective quark mass as well as an independent bag pressure. By studying which phase dominates thermodynamically in what region of temperature and baryon number density, we obtain a phase diagram for strongly interacting matter and gain some insight on the relation between deconfinement and chiral symmetry restoration. 相似文献
7.
We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner. We analyze the behaviour in this dense environment of dynamically-generated baryonic resonances as well as the open-charm meson spectral functions. We discuss the implications of the in-medium properties of open-charm mesons on the DsO(2317) and the predicted X(3700) scalar resonances. 相似文献
8.
L. Tolos D. Gamermann C. Garcia-Recio R. Molina J. Nieves E. Oset A. Ramos 《中国物理 C》2010,34(9):1335-1338
We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner.We analyze the behaviour in this dense environment of dynamically-generated baryonic resonances as well as the open-charm meson spectral functions.We discuss the implications of the in-medium properties of open-charm mesons on the D s0 (2317) and the predicted X(3700) scalar resonances. 相似文献
9.
CHANG Chao-Hsi LI Tong LI Xue-Qian WANG Yu-Ming 《理论物理通讯》2008,49(4):993-1000
In this work, we evaluate the lifetimes of the doubly charmed baryons Ξcc^+ ,Ξcc^++, and Ωcc^+. We carefully calculate the non-spectator contributions at the quark level, where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment. If more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored. 相似文献
10.
A diquark model is used to investigate single-charmed baryons.In this model,baryon is composed of two diquarks and an antiquark.Masses of lowest lying states with J~P=1/2~(±) are obtained.Baryons in our results are as heavy as other theoretic predictions and we suggest that the five-quark components should be considered in any three-quark model for studying the charmed baryons. 相似文献
11.
Su Houng Lee Shigehiro Yasui Wei Liu Che Ming Ko 《The European Physical Journal C - Particles and Fields》2008,54(2):259-265
Based on the color–spin interaction in diquarks, we argue that charmed multiquark hadrons are likely to exist. Because of
the appreciable number of charm quarks produced in central nucleus–nucleus collisions at ultrarelativistic energies, the production
of charmed multiquark hadrons is expected to be enhanced in these collisions. Using both the quark coalescence model and the
statistical hadronization model, we estimate the yield of charmed tetraquark mesons, Tcc, and pentaquark baryons, Θcs, in heavy ion collisions at RHIC and LHC. We further discuss the decay modes of these charmed exotic hadrons in order to
facilitate their detections in experiments.
PACS 25.75.Dw; 14.20.Lq; 14.40.Lb 相似文献
12.
L. Tolos C. Garcia-Recio V. K. Magas T. Mizutani J. Nieves A. Ramos L. L. Salcedo 《中国物理 C》2009,33(12):1323-1326
We study charmed baryon resonances that are generated dynamically from a coupled-channel unitary approach that implements heavy-quark symmetry. Some states can already be identified with experimental observations, such as Ac(2595), Ac(2660), Ec(2902) or Ac(2941), while others need a compilation of more experimental data as well as an extension of the model to include higher order contributions. We also compare our model to previous SU(4) schemes. 相似文献
13.
In the presence of right-handed currents including , it is emphasized that the dominant parity-violating (-conserving) Hamiltonian for nonleptonic decays of charmed hadrons transforms like of SU(4), and leads to distinctive results especially in D+ → KSπ+, F+ → μ+νμ and D0 → K?e+νe, etc. 相似文献
14.
We present a systematic and self-consistent analysis of four-quark charmonium states and applied it to study compact four-quark systems and meson-meson molecules. Our results are robust and should serve to clarify the situation of charmonium spectroscopy above the threshold production of charmed mesons. 相似文献
15.
We study charmed baryon resonances that are generated dynamically from a coupled-channel unitary approach that implements heavy-quark symmetry. Some states can already be identified with exper-imental observations, such as Λ_c(2595), Λ_c(2660), Σ_c(2902) or Λ_c(2941), while others need a compilation of more experimental data as well as an extension of the model to include higher order contributions. We also compare our model to previous SU(4) schemes. 相似文献
16.
In the framework of Quark-Gluon-String Model developed recently in ITEP we calculate spectra of charmed particlesD,D s,Λc,Ξc,Ωc in hadron-hadron collisions taking into account the decays ofS-wave resonances like D*,Ds *,Σc,Σc *,Ξc *,Ξc ′, and Ωc *. We describe the bulk of the existing data onD, D*, adΛ c production in πp andpp collisions and predict the yield of charmed particlesin Σ?p and Ξ?p reactions at hyperon beam energies of 340 GeV/c and 600 GeV/c. Because of significant production of baryon resonances our predictions for unfavored fragmentation differ from predictions of other models which do not take resonance production into account. 相似文献
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19.
S. Migura D. Merten B. Metsch H. -R. Petry 《The European Physical Journal A - Hadrons and Nuclei》2006,28(1):41-53
We calculate mass spectra of charmed baryons within a relativistically covariant quark model based on the Bethe-Salpeter equation
in instantaneous approximation. Interactions are given by a linearly rising three-body confinement potential and a flavor-dependent
two-body force derived from QCD instanton effects. This model has already been successfully applied to the calculation of
light flavor baryon spectra and is now extended to heavy baryons. Within the same framework we compare the results to those
obtained with the more conventional one-gluon exchange potential. 相似文献
20.
Dynamical calculations of charmed meson production rates (via quark exchange) are presented, replacing previous kinematic predictions. Agreement with recent data on the ratio of production rates for different two-charmed-meson final states is reached, and other features of the calculated rates are also discussed. 相似文献