2016/01/15 by D. R. Entem, Entem, D. R., Pablo G. Ortega +3
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1601.03901
openalex publication_date 2016/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Since the discovery of the X(3872) the study of heavy meson molecules has been the subject of many investigations. On the experimental side different experiments have looked for its spin partners and the bottom analogs. On the theoretical side different approaches have been used to understand this state. Some of them are EFT that impose HQSS and so they make predictions for the partners of the X(3872), suggesting the existence of a JPC=2++ partner in the charm sector or JPC=1++ or 2++ analogs in the bottom. In our work, in order to understand the X(3872), we use a Chiral quark model in which, due to the proximity to the DD^* threshold, we include c c states coupled to DD^* molecular components. In this coupled channel model the relative position of the bare c c states with two meson thresholds are very important. We have looked for the X(3872) partners and we don't find a bound state in the D^*D^* JPC=2++. In the bottom sector we find the opposite situation where the B^*B^* with JPC=2++ is bounded while the JPC=1++ is not bounded. These results shows how the coupling with c c states can induced different results than those expected by HQSS. The reason is that this symmetry is worse in the open heavy meson sector than in the hidden heavy meson sector.