Inspired by the latest experimental progress,we systematically study the Okubo-Zweig-Iizuka(OZI)-allowed two-body strong decay properties of 1P-,1D-,2S-,and 2P-wave baryons within the j-j coupling scheme in the framew...Inspired by the latest experimental progress,we systematically study the Okubo-Zweig-Iizuka(OZI)-allowed two-body strong decay properties of 1P-,1D-,2S-,and 2P-wave baryons within the j-j coupling scheme in the framework of the quark pair creation model.The calculations indicate the following.(i)Taking the observed statesΛ_(c)(2595)^(+)andΛ_(c)(2625)^(+)as the 1P-waveλ-mode statesΛ_(c)J^(P)=1/2^(-),1>λandΛ_(c)J^(P)=3/2^(-),1>λ,respectively,we can reproduce the experimental data well in theory.(ii)Combined with the measured mass and decay properties ofΛ_(c)(2860)^(+),this excited state can be explained as the 1D-waveλ-mode stateΛ_(c)J^(P)=32+1>λλ.(iii)The newly observed stateΛ_(c)(2910)+may be assigned as one of the 1P-waveρ-mode statesΛ_(c)J^(P)=3/2^(-),2>λorΛ_(c)J^(P)=522>ρ.Meanwhile,we notice that the partial decay width ratio betweenΣ_(c)πandΣ_(c)^(*)πfor the two candidates is significantly different.Hence,experimental progress in this ratio measurement may elucidate the nature ofΛ_(c)(2910)+.(iv)According to the properties ofΛ_(c)(2765)+,we find that the 2S-waveλ-mode stateΛ_(c)1J^(P)=1/2^(+),0>λis a potential candidate.(v)The 2P-waveλ-mode stateΛ_(c)1J^(P)=3/2^(-),1>λis most likely to be a good assignment of the controversial stateΛ_(c)(2940)^(+).Both the total decay width and partial decay ratio between pD^(0)andΣ_(c)πare in good agreement with observations.(vi)In addition,for the missingΛ_(c)excitations,we obtain their strong decay properties and hope these are useful for future experimental exploration.展开更多
基金Supported by the National Natural Science Foundation of China(12005013,12175065,12235018,11947048)。
文摘Inspired by the latest experimental progress,we systematically study the Okubo-Zweig-Iizuka(OZI)-allowed two-body strong decay properties of 1P-,1D-,2S-,and 2P-wave baryons within the j-j coupling scheme in the framework of the quark pair creation model.The calculations indicate the following.(i)Taking the observed statesΛ_(c)(2595)^(+)andΛ_(c)(2625)^(+)as the 1P-waveλ-mode statesΛ_(c)J^(P)=1/2^(-),1>λandΛ_(c)J^(P)=3/2^(-),1>λ,respectively,we can reproduce the experimental data well in theory.(ii)Combined with the measured mass and decay properties ofΛ_(c)(2860)^(+),this excited state can be explained as the 1D-waveλ-mode stateΛ_(c)J^(P)=32+1>λλ.(iii)The newly observed stateΛ_(c)(2910)+may be assigned as one of the 1P-waveρ-mode statesΛ_(c)J^(P)=3/2^(-),2>λorΛ_(c)J^(P)=522>ρ.Meanwhile,we notice that the partial decay width ratio betweenΣ_(c)πandΣ_(c)^(*)πfor the two candidates is significantly different.Hence,experimental progress in this ratio measurement may elucidate the nature ofΛ_(c)(2910)+.(iv)According to the properties ofΛ_(c)(2765)+,we find that the 2S-waveλ-mode stateΛ_(c)1J^(P)=1/2^(+),0>λis a potential candidate.(v)The 2P-waveλ-mode stateΛ_(c)1J^(P)=3/2^(-),1>λis most likely to be a good assignment of the controversial stateΛ_(c)(2940)^(+).Both the total decay width and partial decay ratio between pD^(0)andΣ_(c)πare in good agreement with observations.(vi)In addition,for the missingΛ_(c)excitations,we obtain their strong decay properties and hope these are useful for future experimental exploration.
