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Cho, S.*; Hyodo, Tetsuo*; Jido, Daisuke*; Ko, C. M.*; Lee, S. H.*; Maeda, Saori*; Miyahara, Kenta*; Morita, Kenji*; Nielsen, M.*; Onishi, Akira*; et al.
Progress in Particle and Nuclear Physics, 95, p.279 - 322, 2017/07
Times Cited Count:94 Percentile:89.92(Physics, Nuclear)With upgraded detectors at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), it has become possible to measure hadrons beyond their ground states in high energy heavy ion collisions. Therefore, heavy ion collisions provide a new method for studying exotic hadrons that are either molecular states made of various hadrons or compact system consisting of muliquarks. Because their structures are related to the fundamental properties of Quantum Chromodynamics (QCD), studying exotic hadrons is currently one of the most active areas of research in hadron physics. The present review is a summary of the current understanding of a selected set of exotic candidate particles that can be potentially measured in heavy ion collisions.
Miyahara, Kenta*; Hyodo, Tetsuo*; Oka, Makoto; Nieves, J.*; Oset, E.*
Physical Review C, 95(3), p.035212_1 - 035212_12, 2017/03
Times Cited Count:28 Percentile:89.50(Physics, Nuclear)Nonleptonic weak decays of into and a meson-baryon final state, , are analyzed from the viewpoint of probing baryon resonances, i.e. and . We argue that the weak decay of is dominated by a single quark-line diagram. The decay process has an advantage of being free from meson resonances in the invariant mass distribution. The invariant mass distribution of the meson-baryon final state is calculated, assuming that the and resonances have . It is found that a clear peak for the is seen in the and spectra. We also suggest that the ratios of the , and final states are useful to distinguish whether the peak is originated from the resonance or it is a threshold effect.