We study charmonium （ccnn）,bottomonium （b bnn） and exotic （ccnn and bbnn） four-quark states by means of a standard non-relativistic quark potential model.We look for possible bound states.Among them we are able ...We study charmonium （ccnn）,bottomonium （b bnn） and exotic （ccnn and bbnn） four-quark states by means of a standard non-relativistic quark potential model.We look for possible bound states.Among them we are able to distinguish between meson-meson molecules and compact four-quark states.展开更多
The coupledΛΛnn-Ξ-pnn system was studied to investigate whether the inclusion of channel coupling is able to bind theΛΛnn system.We use a separable potential three-body model of the coupledΛΛnn-Ξ-pnn system an...The coupledΛΛnn-Ξ-pnn system was studied to investigate whether the inclusion of channel coupling is able to bind theΛΛnn system.We use a separable potential three-body model of the coupledΛΛnn-Ξ-pnn system and a variational four-body calculation with realistic interactions.Our results exclude the possibility of aΛΛnn bound state by a large margin.Instead,we found aΞ-t quasibound state above theΛΛnn threshold.展开更多
We use an existing model of theΛΛN−ΞNN three-body system based on two-body separable interactions to study the(I,JP)=(1/2,1/2+)three-body channel.For theΛΛ,ΞN,andΛΛ−ΞN amplitudes,we have constructed separable...We use an existing model of theΛΛN−ΞNN three-body system based on two-body separable interactions to study the(I,JP)=(1/2,1/2+)three-body channel.For theΛΛ,ΞN,andΛΛ−ΞN amplitudes,we have constructed separable potentials based on the most recent results of the HAL QCD Collaboration.They are characterized by the existence of a resonance just below or above theΞN threshold in the H-dibaryon channel,(i,jp)=(0,0+).A three-body resonance appears 2.3 MeV above theΞd threshold.We show that if theΛΛ−ΞN H-dibaryon channel is not considered,theΛΛN−ΞNN S wave resonance disappears.Thus,the possible existence of aΛΛN−ΞNN resonance would be sensitive to theΛΛ−ΞN interaction.The existence or nonexistence of this resonance could be evidenced by measuring,for example,theΞd cross section.展开更多
Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the p...Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the possible existence of a ^4 ΛΛn bound state. Our results indicate that the ^4 ΛΛn is unbound, being just above threshold.We discuss the role played by the -1S0 nn repulsive term of the Yukawa-type Malfliet-Tjon interaction.展开更多
基金partially funded by Ministerio de Ciencia y Tecnología under Contract No.FPA2007-65748EUFEDER,and by Junta de Castilla y León under Contracts No.SA016A17 and GR12
文摘We study charmonium （ccnn）,bottomonium （b bnn） and exotic （ccnn and bbnn） four-quark states by means of a standard non-relativistic quark potential model.We look for possible bound states.Among them we are able to distinguish between meson-meson molecules and compact four-quark states.
基金partially funded by COFAA-IPN(México)Ministerio de Economía,Industria y Competitividad and EU FEDER(FPA2016-77177)
文摘The coupledΛΛnn-Ξ-pnn system was studied to investigate whether the inclusion of channel coupling is able to bind theΛΛnn system.We use a separable potential three-body model of the coupledΛΛnn-Ξ-pnn system and a variational four-body calculation with realistic interactions.Our results exclude the possibility of aΛΛnn bound state by a large margin.Instead,we found aΞ-t quasibound state above theΛΛnn threshold.
基金This work has been partially funded by COFAA-IPN(Mexico)and by Ministerio de Ciencia e Innovacion and EU FEDER(FPA2016-77177-C2-2-P,PID2019-105439GB-C22,RED2018-102572-T)。
文摘We use an existing model of theΛΛN−ΞNN three-body system based on two-body separable interactions to study the(I,JP)=(1/2,1/2+)three-body channel.For theΛΛ,ΞN,andΛΛ−ΞN amplitudes,we have constructed separable potentials based on the most recent results of the HAL QCD Collaboration.They are characterized by the existence of a resonance just below or above theΞN threshold in the H-dibaryon channel,(i,jp)=(0,0+).A three-body resonance appears 2.3 MeV above theΞd threshold.We show that if theΛΛ−ΞN H-dibaryon channel is not considered,theΛΛN−ΞNN S wave resonance disappears.Thus,the possible existence of aΛΛN−ΞNN resonance would be sensitive to theΛΛ−ΞN interaction.The existence or nonexistence of this resonance could be evidenced by measuring,for example,theΞd cross section.
基金Supported by COFAA-IPN(Mxico),Ministerio de Economía,Industria y Competitividad and EU FEDER(FPA2013-47443,FPA2015-69714-REDT,FPA2016-77177)Junta de Castilla y Len(SA041U16)Generalitat Valenciana Prometeo II/2014/066
文摘Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the possible existence of a ^4 ΛΛn bound state. Our results indicate that the ^4 ΛΛn is unbound, being just above threshold.We discuss the role played by the -1S0 nn repulsive term of the Yukawa-type Malfliet-Tjon interaction.
