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Saionji, Takahiro*; Jido, Daisuke*; Harada, Masayasu*
Progress of Theoretical and Experimental Physics (Internet), 2023(3), p.033D01_1 - 033D01_18, 2023/03
Times Cited Count：0 Percentile：0.01(Physics, Multidisciplinary)Iwasaki, Sachio*; Jido, Daisuke*; Oka, Makoto; Suzuki, Kei
Physics Letters B, 820, p.136498_1 - 136498_6, 2021/09
Times Cited Count：2 Percentile：18.91(Astronomy & Astrophysics)We investigate time evolution of 
-wave charmonium populations under a time-dependent homogeneous magnetic field and evaluate survival probabilities of the low-lying charmonia to the goal of estimating the magnetic field strength at heavy-ion collisions. Our approach implements mixing between different spin eigenstates and transitions to radially excited states. We show that the survival probabilities can change even by an extremely short magnetic field. Furthermore, we find that the survival probabilities depend on the initial spin states. We propose the sum of the survival probabilities over spin partners as an observable insensitive to the initial states. We also find that the sum can be approximately given as a function of 
with a duration time 
and the maximum strength of the magnetic field 
.
Kim, H.*; Kim, K. S.*; Cheoun, M.-K.*; Jido, Daisuke*; Oka, Makoto
Physical Review D, 99(1), p.014005_1 - 014005_15, 2019/01
Times Cited Count：8 Percentile：44.95(Astronomy & Astrophysics)We investigate additional signatures to support the tetraquark mixing framework that has been recently proposed as a possible structure for the two nonets. We reexamine the mass ordering generated from the tetraquark nonets and show that this mass ordering is satisfied by the two nonets although the ordering in the heavy nonet is marginal. The marginal mass ordering can be regarded as another signature for tetraquarks because it can be explained partially by the hyperfine masses calculated from the tetraquark mixing framework. As a peculiar signature distinguished from the other approaches, we investigate the fall-apart coupling strengths into two vector mesons from our tetraquarks. Coupling strengths into the two-vector modes are found to enhance strongly in the heavy nonet while they are suppressed in the light nonet. The coupling ratios are found to be huge. This trend in the two-vector modes can provide another testing ground for the tetraquark mixing framework. Some experimental evidence related to the phenomena is discussed particularly from the resonances belonging to the heavy nonet.
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：93 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.
Sekihara, Takayasu; Hyodo, Tetsuo*; Jido, Daisuke*; Yamagata-Sekihara, Junko*; Yasui, Shigehiro*
Proceedings of Science (Internet), 281, p.289_1 - 289_8, 2017/05
bound state on a deuteron target with forward proton emissionSekihara, Takayasu; Sakai, Shuntaro*; Jido, Daisuke*
Physical Review C, 94(2), p.025203_1 - 025203_11, 2016/08
Times Cited Count：4 Percentile：33.5(Physics, Nuclear)Kim, H.*; Kim, K. S.*; Cheoun, M.-K.*; Jido, Daisuke*; Oka, Makoto
European Physical Journal A, 52(7), p.184_1 - 184_8, 2016/07
Times Cited Count：13 Percentile：68.15(Physics, Nuclear)Assuming four-quark structure for the 
resonances in low-lying region, we calculate their masses using the color-spin interaction. In specific, the hyperfine masses of the color-spin interaction are calculated for the possible states in spin-0, spin-1, spin-2 channels. The two states in spin-0 channel as well as the two states in spin-1 channel are diagonalized in order to generate the physical hyperfine masses. By matching the difference in hyperfine masses with the splitting in corresponding hadron masses and using the 
mass as an input, we estimate the masses corresponding to the states 
. We find the masses of two states in 
are close to those of 
, 
, and the mass of the 
state is close to that of 
. For them, the discrepancies are about 
MeV. This may suggest that the quantum numbers of the controversial states are 
. In this work, we use the same inputs parameters, the constituent quark masses and the strength of the color-spin interaction, that have been adopted in the previous work on the 
or 
-meson excited states. There, it was shown that the four-quark structure can be manifested in their excited states. Thus, our results in this work provide a consistent treatment on open- and hidden-charm mesons as far as the four-quark model is concerned.
bound state on deuteron target with forward proton emissionSekihara, Takayasu; Sakai, Shuntaro*; Jido, Daisuke*
no journal, ,
Oka, Makoto; Wang, G.-J.*; Jido, Daisuke*
no journal, ,
I report the results of four charm quark systems in the novel confinement potential model based on QCD.
Oka, Makoto; Wang, G. J.*; Jido, Daisuke*
no journal, ,
I report the results of four charm tetra-quark states in the novel confinement potential model based on QCD.
