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Register a new userQuadruply charmed baryons as heavy quark symmetry partners of the $D_{s0}^*(2317)$
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Both unitary chiral theories and lattice QCD simulations show that the $DK$ interaction is attractive and can form a bound state, namely, $D^*_{s0}(2317)$. Assuming the validity of the heavy antiquark-diquark symmetry (HADS), the $Xi_{cc}bar{K}$ interaction is the same as the $DK$ interaction, which implies the existence of a $Xi_{cc}bar{K}$ bound state with a binding energy of $49-64$ MeV. In this work, we study whether a $Xi_{cc}Xi_{cc}bar{K}$ three-body system binds. The $Xi_{cc}Xi_{cc}$ interaction is described by exchanging $pi$, $sigma$, $rho$, and $omega$ mesons, with the corresponding couplings related to those of the $NN$ interaction via the quark model. We indeed find a $Xi_{cc}Xi_{cc}bar{K}$ bound state, with quantum numbers $J^P=0^-$, $I=frac{1}{2}$, $S=1$ and $C=4$, and a binding energy of $80-118$ MeV. It is interesting to note that this system is very similar to the well-known $NNbar{K}$ system, which has been studied extensively both theoretically and experimentally. Within the same framework, we show the existence of a $NNbar{K}$ state with a binding energy of $35-43$ MeV, consistent with the results of other theoretical works and experimental data, which serves as a consistency check on the predicted $Xi_{cc}Xi_{cc}bar{K}$ bound state.
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We report improved measurements of the product branching fractions ${mathcal B}(B^+rightarrowbar{D}^0 D_{s0}^{*+} (2317))times{mathcal B}( D_{s0} ^{*+}(2317)rightarrow D_s^{+}pi^0) =(8.0^{+1.3}_{-1.2} pm 1.1 pm 0.4)times 10^{-4}$ and ${mathcal B}(B^0rightarrow D^- D_{s0} ^{*+}(2317))times{mathcal B}(D_{s0}^{*+}(2317)rightarrow D_s^{+}pi^0) =(10.2^{+1.3}_{-1.2} pm 1.0 pm 0.4)times 10^{-4}$, where the first errors are statistical, the second are systematic and the third are from $D$ and $D_s$ branching fractions. In addition, we report negative results from a search for hypothesized neutral ($Z^0$) and doubly charged ($Z^{++}$) isospin partners of the $D_{s0}^{*+}(2317)$ and provide upper limits on the product branching fractions ${mathcal B}(B^0 rightarrow D^0 z^0)times{mathcal B}(z^0rightarrow D_s^{+}pi^-)$ and ${mathcal B}(B^+rightarrow D^- z^{++})times{mathcal B}(z^{++}rightarrow D_s^{+}pi^+)$ that are more than an order of magnitude smaller than theoretical expectations for the hypotheses that the $D_{s0} ^{*+}(2317)$ is a member of an isospin triplet. The analysis uses a 711 fb$^{-1}$ data sample containing 772 million $Bbar{B}$ meson pairs collected at the $Upsilon(4S)$ resonance in the Belle detector at the KEKB collider.
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 $Lambda_c(2595)$, $Lambda_c(2660)$, $Sigma_c(2902)$ or $Lambda_c(2941)$, 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.
We study the temperature and baryon density dependence of the masses of the lightest charmed baryons $Lambda_c$, $Sigma_c$ and $Sigma^*_c$. We also look at the effects of the temperature and baryon density on the binding energies of the $Lambda_c N$ and $Lambda_c Lambda_c$ systems. Baryon masses and baryon-baryon interactions are evaluated within a chiral constituent quark model. Medium effects are incorporated in those parameters of the model related to the dynamical breaking of chiral symmetry, which are the masses of the constituent quarks, the $sigma$ and $pi$ meson masses, and quark-meson couplings. We find that while the in-medium $Lambda_c$ mass decreases monotonically with temperature, those of $Sigma_c$ and $Sigma^*_c$ have a nonmonotonic dependence. These features can be understood in terms of a simple group theory analysis regarding the one-gluon exchange interaction in those hadrons. The in-medium $Lambda_c N$ and $Lambda_c Lambda_c$ interactions are governed by a delicate balance involving a stronger attraction due to the decrease of the $sigma$ meson mass, suppression of coupled-channel effects and lower thresholds, leading to shallow bound states with binding energies of a few~MeV. The $Lambda_c$ baryon could possibly be bound to a large nucleus, in qualitative agreement with results based on relativistic mean field models or QCD sum rules. Ongoing experiments at RHIC or LHCb or the planned ones at FAIR and J-PARC may take advantage of the present results.
The relevance of chiral symmetry in baryons is highlighted in three examples in the nucleon spectroscopy and structure. The first one is the importance of chiral dynamics in understanding the Roper resonance. The second one is the role of chiral symmetry in the lattice calculation of $pi N sigma$ term and strangeness. The third one is the role of chiral $U(1)$ anomaly in the anomalous Ward identity in evaluating the quark spin and the quark orbital angular momentum. Finally, the chiral effective theory for baryons is discussed.
In this work, we systematically investigate the heavy-strange meson systems, $D^{(*)}K^{(*)}/bar{B}^{(*)}K^{(*)}$ and $bar{D}^{(*)}K^{(*)}/B^{(*)}K^{(*)}$, to study possible molecules in a quasipotenial Bethe-Salpter equation approach together with the one-boson-exchange model. The potential is achieved with the help of the hidden-gau ge Lagrangians. Molecular states are found from all six S-wave isoscalar interactions of $D^{(*)}K^{(*)}/bar{B}^{(*)}K^{(*)}$. The charmed-strange mesons $D^*_{s0}(2317)$ and $D_{s1}(2460)$ can be related to the ${D}K$ and $D^*K$ states with spin parities $0^+$ and $1^+$, respectively. The recent observed $B_{sJ}(6158)$ may be assigned as a $bar{B}K^*$ molecular state with $1^+$. Four molecular states are produced from the interactions of $bar{D}^{(*)}K^{(*)}/B^{(*)}K^{(*)}$, among which the $bar{D}^*{K}^*$ molecular state with $0^+$ can be related to the $X_0(2900)$. No isovector molecular states are found in the interactions considered. The current results are helpful to understand the internal structure of $D^*_{s0}(2317)$, $D_{s1}(2460)$, $X_0(2900)$, and new $B_{sJ}$ states. The experimental research for more heavy-strange meson molecules are suggested.
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