We study charmed and strange baryon resonances that are generated dynamically by a unitary baryon-meson coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry plus a suitable symmetry breaking. The model produces resonances with negative parity from s-wave interaction of pseudoscalar and vector mesons with 1/2 + and 3/2 + baryons. Resonances in all the isospin, spin, and strange sectors with one, two, and three charm units are studied. Our results are compared with experimental data from several facilities, such as the CLEO, Belle or BaBar Collaborations, as well as with other theoretical models. Some of our dynamically generated states can be readily assigned to resonances found experimentally, while others do not have a straightforward identification and require the compilation of more data and also a refinement of the model. In particular, we identify the Ξc(2790) and Ξc(2815) resonances as possible candidates for a heavy-quark spin symmetry doublet.

We develop a model to describe odd parity baryon resonances generated dynamically through a unitary baryon-meson coupled-channels approach. The scheme applies to channels with light and/or heavy quark content. Distinct features of the model are that, i) the interaction is an S-wave contact one, ii) it reduces to the SU(3) Weinberg-Tomozawa Hamiltonian when light pseudoscalar mesons are involved, thus, respecting chiral symmetry, iii) spin-flavor in preserved in the light quark sector, and iv) heavy quark spin symmetry is fulfilled in the heavy quark sector. In particular, baryon-meson states with different content in c or inc do not mix. The model is a minimal one and it contains no free parameters. In this work, we focus on baryon resonances with hidden-charm (at least onec and one c quarks). We analyze several possible sectors and, for the sector with zero net charm, we write down the most general Lagrangian consistent with SU(3) and heavy quark spin symmetry. We explicitly study the N and ∆ states, which are produced from the S-wave interaction of pseudoscalar and vector mesons with 1/2 + and 3/2 + baryons within the charmless and strangeless hidden charm sector. We predict seven odd parity N -like and five ∆-like states with masses around 4 GeV, most of them as bound states. These states form heavy-quark spin multiplets, which are almost degenerate in mass. The predicted new resonances definitely cannot be accommodated by quark models with three constituent quarks and they might be looked for in the forthcomingPANDA experiment at the future FAIR facility.

The LHCb Collaboration has recently observed two narrow baryon resonances with beauty. Their masses and decay modes look consistent with the quark model orbitally excited states Λ b (5912) and Λ * b (5920), with quantum numbers J P = 1/2 − and 3/2 − , respectively. We predict the existence of these states within a unitarized meson-baryon coupled-channel dynamical model, which implements heavy-quark spin symmetry. Masses, quantum numbers and couplings of these resonances to the different meson-baryon channels are obtained. We find that the resonances Λ

The interaction and propagation ofB mesons with light mesons, N and Δ, is studied within a unitarized approach based on effective models that are compatible with chiral and heavy-quark symmetries. We find several heavy-quark spin doublets in the open bottom sectors, whereB andB Ã mesons are present. In the meson sector we find several resonant states, among them a B 0 and a B 1 with masses 5530 MeV and 5579 MeV as well as B Ã s0 and B Ã s1 narrow states at 5748 MeV and 5799 MeV, respectively. They form two doublets with no experimental identification yet, the first one being the bottom counterpart of the D 0 ð2400Þ and D 1 ð2430Þ states, and the second bottom doublet associated to the ubiquitous D Ã s0 ð2317Þ and the D s1 ð2460Þ. In the baryon sector, several Λ b and Σ b doublets are identified, among them the one given by the experimental Λ b ð5910Þ and Λ Ã b ð5921Þ. Moreover, one of our states, the Σ Ã b ð5904Þ, turns out to be the bottom counterpart of the experimental Σ Ã ð1670Þ and predicted Σ Ã c ð2550Þ, which is a case for discovery. We finally analyze different transport coefficients for theB meson in hot matter, such as those formed in heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC). For RHIC/LHC energies, the main contribution to the coefficients comes from the interaction ofB mesons with pions. However, we also include the effects of baryonic density which might be sizable at temperatures T ≲ 100 MeV, as the chemical potential is expected to increase in the last stages of the expansion. We conclude that although the relaxation time decreases with larger baryonic densities, theB meson does not thermalize at RHIC/LHC energies, representing an ideal probe for the initial bottom distribution.

We study charmed and strange odd-parity baryon resonances that are generated dynamically by a unitary baryon-meson coupledchannels model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry plus a suitable symmetry breaking. The model generates resonances with negative parity from the s-wave interaction of pseudoscalar and vector mesons with 1/2 + and 3/2 + baryons in all the isospin, spin, and strange sectors with one, two, and three charm units. Some of our results can be identified with experimental data from several facilities, such as the CLEO, Belle, or BaBar Collaborations, as well as with other theoretical models, whereas others do not have a straightforward identification and require the compilation of more data and also a refinement of the model.