夸克蜕定域色屏蔽模型研究Σ_c(2800)和Λ_c(2940)
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摘要
在夸克蜕定域色屏蔽模型框架下,利用共振群方法研究了同位旋为I=0和I=1,角动量为J~P=1/2±,3/2±,5/2±的分子态ND体系,发现所有的正宇称态都不束缚.经过多道耦合计算,我们得到了I=0,J~P=1/2~-的ND分子态,可以用来解释实验上报道的Σ_c(2 800),I=0,J~P=3/2~-的ND~*分子态可以解释实验报道的Λ_c(2 940),另外还存在一个I=1,J~P=5/2~-的ΔD~*分子态.
The ND systems with I = 0 and I = 1,J~P=1/2±,3/2±,5/2± are dynamically investigated within the framework of the quark delocalization color screening model. The results show that by the channel-coupling calculation,there is a ND bound state with I = 0,J~P=1/2~-,which can be used to explain the reported Σ_c( 2 800); a ND*bound state with I = 0,J~P=3/2~- is obtained,which can be used to explain the reported Λ_c( 2 940). Besides,another bound state ΔD*with I = 1,J~P=5/2~- is also obtained.
The ND systems with I = 0 and I = 1,J~P=1/2±,3/2±,5/2± are dynamically investigated within the framework of the quark delocalization color screening model. The results show that by the channel-coupling calculation,there is a ND bound state with I = 0,J~P=1/2~-,which can be used to explain the reported Σ_c( 2 800); a ND*bound state with I = 0,J~P=3/2~- is obtained,which can be used to explain the reported Λ_c( 2 940). Besides,another bound state ΔD*with I = 1,J~P=5/2~- is also obtained.
引文
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[18]HUANG H X,PING J L,WANG F.Further study of the NΩdibaryon within constituent quark models[J].Phys Rev C,2015,92:065202(1-6).
[2]AUBERT B,BONA M,KARYOTAKIS Y,et al.[BABAR Collaboration],Measurements of B(B0→Λ+cp珔)and B(B-→Λ+cπ-)and studies ofΛ+cπ-resonances[J].Phys Rev D,2008,78:112003(1-18).
[3]AUBERT B,BARATE R,BONA M,et al.[BABAR Collaboration],Observation of a charmed baryon decaying to D0p at a mass near 2.94 Ge V/c2[J].Phys Rev Lett,2007,98:012001(1-7).
[4]MIZUK R,ABE K,ADACHI I,et al.[Belle Collaboration],Experimental constraints on the spin and parity of theΛc(2800)+[J].Phys Rev Lett,2007,98:262001(1-6).
[5]LUTZ M F M,KOLOMEITSEV E E.Baryon resonances from chiral coupled-channel dynamics[J].Nucl Phys A,2005,755:29-40.
[6]JIMTENEZ-TEJERO C E,RAMOS A,VIDANA I.Dynamically generated open-charm baryons beyond the zero-range approximation[J].Phys Rev C,2009,80:055206(1-11).
[7]ZHANG J R.S-wave D(*)Nmolecular states:Σc(2800)andΛc(2940)+?[J].Phys Rev D,2014,89:096006(1-10).
[8]HE J,LIU X.Observed charmed hadronΛc(2940)+and the D(*)N interaction[J].Phys Rev D,2010,82:114029(1-8).
[9]CAPSTICK S,ISGUR N.Baryons in a relativized quark model with chromodynamics[J].Phys Rev D,1986,34:2809-2836.
[10]CHENG H Y,CHUA C K.Strong decays of charmed baryons in heavy hadron chiral perturbation theory[J].Phys Rev D,2007,75:014006(1-14).
[11]ISHII N,AOKI S,HATSUDA T.Nuclear force from lattice QC[J].Phys Rev Lett,2007,99:022001(1-4).
[12]WANG F,WU G H,TENG L J,et al.Effective baryon-baryon potentials in the quark delocalization and color screening model[J].Phys Rev Lett,1992,69:2901-2915.
[13]WU G H,TENG L J,PING J L,et al.Quark delocalization,color screening,and N-N intermediate range attraction:P-waves[J].Phys Rev,1996,C53:1161-1166.
[14]PING J L,WANG F,GOLDMAN T.Quark delocalization color screening,and nuclear intermediate range attraction[J].Nucl Phys,1999,A657:95-98.
[15]CHEN L Z,PANG H R,HUANG H X,et al,Alternative approach toσ-meson exchange in the nucleon-nucleon interaction[J].Phys Rev C,2007,76:014001(1-4).
[16]PING J L,HUANG H X,PANG H R,et al.Quark models of dibaryon resonances in nucleon-nucleon scattering[J].Phys Rev,2009,C79:024001(1-12).
[17]VIJANDE J,FERNANDEZ F,VALCARCE A.Constituent quark model study of the meson spectra[J].Phys G,2005,31:481-506.
[18]HUANG H X,PING J L,WANG F.Further study of the NΩdibaryon within constituent quark models[J].Phys Rev C,2015,92:065202(1-6).