| Hadron physics is an unique and important research area.The simplest structures include mesons and baryons,which mesons are composed of a pair of quark and antiquark and baryons are composed of three quarks within the naive quark model.With the experimental progress,a serial of X/Y/Z and Pc states have been observed by experimental collaborations such as CLEO-c,BaBar,Belle,BESIII,CDF,DO,LHCb,CMS and so on.Because these X/Y/Z and P,states can decay to final states with cc quark configurations,their properties are deviation from the quark model predictions of charmonium states,and the masses of many newly observations are very close to a pair of heavy hadrons,explanations of hidden-charm hadronic molecular states are often proposed.These observations have inspired theorist-s'extensive interests in exploring the underlying mechanism behind those exotic phenomena.As one of the most important issues in hadron physics,these studies provide us a good chance to deepen our understanding of the complicated non-perturbative behavior of QCD in the low energy regime.After the introduction,we will discuss the properties of hadronic molecular states by taking the deuteron as an example,and one-boson-exchange effective potentials in the second chapter.In the third chapter,stimulated by the observations of Pc(4380)and Pc(4450),we firstly proposed that the newly observations Pc(4380)and Pc(4450)can be identified as the exotic hidden-charm pentaquarks with the?c(2455)D*and ?c*(2520)D*molecular configurations.And then,we further study the interactions be-tween a heavy baryon and a heavy meson,where we can provide useful information to hunt for other possible hidden-charm pentaquarks-AcDs*/?c(*)Ds*/(?)c(',*)D*systems.In 2016,the DO Collaboration reported a new enhancement structure X(5568)in the Bs0?± invariant mass spectrum.According to its observed decay mode,X(5568)must contain four different valence quark components sudb.Then,different proposals of its inner structures or underly mechanism were proposed.To find the evidence to distinguish these different explanations from the X(5568),we perform a dynamical study of the B(*)and K interaction and show that the newly reported X(5568)cannot be assigned to be an isovector B(*)K molecular state(see the forth chapter for details).Meanwhile,we show our predictions of TT-type hidden-charm molecular states,which may be accessible at future experiments like LHCb and Belle II.In the fifth chapter,we studied systematically heavy baryon-meson interactions with several reason-able parameters input,including a charmed meson and a nucleon systems D1N,D2*N,a charmed baryon and an anti-kaon meson systems ?c(*)K*,and coupled channel systems(?)c*K/?c?/?c?/(?)cK*/(?)cK*/(?)cK*/?c?.Finally,we can predict several possible ?c/?c-like,(?)c-like,and ?c-like exotic molecular baryons.In particular,after dynamical investigated the spectroscopy of exotic ?c states,we find that if the spin parities of the five ?c states observed by LHCb Collaboration are further determined in the future,the?c state with 0(3/2-)predicted here can be related to this found state.Last year,a double-charm baryon(?)cc++ was discovered by the LHCb Collaboration.The observed(?)cc++ not only make the baryon family become complete,but also inspires our interest in exploring the interaction of it with other hadrons(charmed mesons and charmed baryons).Finally,we find possible triple-charm molecular pentaquarks and hexaquarks,which can be accessible at future experiment like LHCb.The relevant work is presented in the sixth chapter. |
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