Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both...Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both meson-meson and diquarkantidiquark configurations are taken into account.The numerical results indicate that there is no bound state in both quark models.However,several resonance states have been predicted.Three resonance states with I(JP)=1/2(0+)are found,the energy ranges of which are 10479-10550,10528-10632,and 10597-10681 MeV,respectively.Three resonance states with I(JP)=1/2(1+)are predicted to be located at 10491-10675,10502-10679,and 10522-10723 MeV,respectively.Moreover,there also exists a resonance with I(JP)=1/2(2+)and the mass is estimated to be 10531-10680 MeV.Besides,the decay widths of these predicted resonances are calculated.All these predicted states in the present work should be accessible for further experiments in LHCb.展开更多
Inspired by the recent observation of a very narrow state,called T_(cc)^(+),by the LHCb collaboration,the possible bound states and low-lying resonance states of the doubly-heavy tetraquark states ccu¯d¯(Tcc...Inspired by the recent observation of a very narrow state,called T_(cc)^(+),by the LHCb collaboration,the possible bound states and low-lying resonance states of the doubly-heavy tetraquark states ccu¯d¯(Tcc)and bbu¯d¯(Tbb)are searched in the framework of a chiral quark model with an accurate few-body method,the Gaussian expansion method.The real scaling method is also applied to identify the genuine resonance states.In the calculation,the meson-meson structure,diquark-antidiquark structure,and their coupling are all considered.The numerical results show:(i)For T_(cc)and T_(bb),only I(J^(P))=0(1^(+))states are bound in different quark structures.The binding energy varies from a few MeV for the meson-meson structure to over 100 MeV for the diquark-antidiquark structure.For example,for T_(cc),in the meson-meson structure,there exists a weakly bound molecule DD^(∗)state around 3841.4 MeV,1.8 MeV below the D^(0)D^(∗+),which may be a good candidate for the observed state by LHCb;however in the diquark-antidiquark structure,a deeper bound state with mass 3700.9 MeV is obtained.When considering the structure mixing,the energy of system decreases to 3660.7 MeV and the shallow bound state disappears.(ii)Besides bound states,several resonance states for T_(QQ)(Q=c,b)with I(J^(P))=1(0^(+)),1(1^(+)),1(2^(+)),0(1^(+))are proposed.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12175037,11775050,11775118,11535005,and11865019)the Fundamental Research Funds for the Central Universities(Grant No.1107022104)the China Postdoctoral Science Foundation(Grant No.1107020201)。
文摘Motivated by the recent discoveries of the hidden charm exotic state with strangeness by the BESⅢand LHCb Collaborations,we study the S-wave hidden bottom tetraquark with strangeness in two kinds of quark models.Both meson-meson and diquarkantidiquark configurations are taken into account.The numerical results indicate that there is no bound state in both quark models.However,several resonance states have been predicted.Three resonance states with I(JP)=1/2(0+)are found,the energy ranges of which are 10479-10550,10528-10632,and 10597-10681 MeV,respectively.Three resonance states with I(JP)=1/2(1+)are predicted to be located at 10491-10675,10502-10679,and 10522-10723 MeV,respectively.Moreover,there also exists a resonance with I(JP)=1/2(2+)and the mass is estimated to be 10531-10680 MeV.Besides,the decay widths of these predicted resonances are calculated.All these predicted states in the present work should be accessible for further experiments in LHCb.
基金Partly supported by the National Natural Science Foundation of China(11847145,11865019)。
文摘Inspired by the recent observation of a very narrow state,called T_(cc)^(+),by the LHCb collaboration,the possible bound states and low-lying resonance states of the doubly-heavy tetraquark states ccu¯d¯(Tcc)and bbu¯d¯(Tbb)are searched in the framework of a chiral quark model with an accurate few-body method,the Gaussian expansion method.The real scaling method is also applied to identify the genuine resonance states.In the calculation,the meson-meson structure,diquark-antidiquark structure,and their coupling are all considered.The numerical results show:(i)For T_(cc)and T_(bb),only I(J^(P))=0(1^(+))states are bound in different quark structures.The binding energy varies from a few MeV for the meson-meson structure to over 100 MeV for the diquark-antidiquark structure.For example,for T_(cc),in the meson-meson structure,there exists a weakly bound molecule DD^(∗)state around 3841.4 MeV,1.8 MeV below the D^(0)D^(∗+),which may be a good candidate for the observed state by LHCb;however in the diquark-antidiquark structure,a deeper bound state with mass 3700.9 MeV is obtained.When considering the structure mixing,the energy of system decreases to 3660.7 MeV and the shallow bound state disappears.(ii)Besides bound states,several resonance states for T_(QQ)(Q=c,b)with I(J^(P))=1(0^(+)),1(1^(+)),1(2^(+)),0(1^(+))are proposed.
