Meson-baryon Systems With Hidden Beauty

In the recent decade,many new hadrons,with open or hidden heavy flavor quark(including charm quark and bottom quark),were discovered by the large scientific facilities in the word,such as BESIII,LHCb,SLAC,KEK and so on.These newly found hadrons could not expressed well with quark model.They might be the so called exotic hadrons predicted by QCD.The hadrons,with open or hidden heavy flavor quark,opened a new widow for the studying on exotic hadrons.In this work,within the framework of chiral unitary theory,we study the in-teracting meson-baryon system with hidden beauty flavour quark,investigating the pseudoscalar meson-baryon scattering(including the coupled B?b,B?b,?bN channel-s)and the vector meson-baryon scattering(including the coupled B*?b,B*?b,?N channels).The lowest order meson-baryon scattering amplitudes are deduced from the Lagrangian for strong interaction between hadrons.By solving the coupled Bethe-Salpeter equation,the total scattering amplitude for meson-baryon was obtained.The poles of the amplitude relate to the hadronic states generated dynamically by the inter-action of meson and baryon.In the sector of pseudoscalar-baryon,two exited baryon states with hidden beauty,isospin I= 0 and spin-parity Jp = 1/2-are dynamically generated during the scattering,corresponding to the poles(10319.9 + i0)MeV and(10897.4-i2.04)MeV.They are regarded as molecular hadron with meson-baryon structure.One has BEb as its main component,the other has the B?b and B?b struc-ture.In the sector of vector meson-baryon,two states with I= 1/2 and Jp = 1/2-are generated dynamically,with the main component as B*?b and B*?b,respectively.The results found in our work is useful for us to understand the interaction between hadrons with open beauty flavor,and to get some information on the properties and nature of exited baryons with hidden beauty flavor.