Abstract
The interaction and propagation of mesons with light mesons, and , 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, where and mesons are present. In the meson sector we find several resonant states, among them a and a with masses 5530 MeV and 5579 MeV as well as and 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 and states, and the second bottom doublet associated to the ubiquitous and the . In the baryon sector, several and doublets are identified, among them the one given by the experimental and . Moreover, one of our states, the , turns out to be the bottom counterpart of the experimental and predicted , which is a case for discovery. We finally analyze different transport coefficients for the 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 of mesons with pions. However, we also include the effects of baryonic density which might be sizable at temperatures , 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, the meson does not thermalize at RHIC/LHC energies, representing an ideal probe for the initial bottom distribution.
- Received 11 March 2014
DOI:https://doi.org/10.1103/PhysRevD.89.074042
© 2014 American Physical Society