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The QCDSF collaboration has investigated the distribution amplitudes and wavefunction normalization constants of the nucleon and its parity partner, the $N^* (1535)$. We report on recent progress in t...
Nucleon and $N^* (1535)$ Distribution Amplitudes
Nucleon $N^* (1535)$ Distribution Amplitudes
2011/1/13
The QCDSF collaboration has investigated the distribution amplitudes and wavefunction normalization constants of the nucleon and its parity partner, the N∗(1535). We report on recent progress in...
A new mechanism for the electromagnetic transition γ*N→N*(1535)
N*(1535) electromagnetic transition helicity amplitudes
2010/5/7
The helicity amplitude Ap1/2 for the electromagnetic transition γ* N→N*(1535) is investigated. It is found that a new mechanism γ*→qq plays an important role in order to improve the description of thi...
Here we employ the extended chiral constituent quark model to investigate the five-quark components in the N*(1535) resonance. The axial charge of N*(1535) and the electromagnetic transition γ* N→N*(1...
N*(1535) contribution in pp→ppη´ and pn→dφ
meson production nucleon-nucleon collision resonance
2009/11/24
In an effective Lagrangian model we find that the N*(1535) resonance contribution might be important to the interpretation of the present data of the pp→ppη´ and pn→dφ reactions. The strong coup...
Axial charges of N(1535) and N(1650) in two-flavor lattice QCD
axial charge chiral symmetry negative parity nucleon
2009/11/24
We show the lattice QCD results on the axial charge gAN*N* of negative parity nucleon resonances, N*(1535) and N*(1650), which are key clues to the chiral structure in baryon sector. The measurements ...
Level Crossing of N*(1535)hole and η Modes and Partial Restoration of Chiral Symmetry in ηmesic Nuclei
A etamesic nuclei N*(1535) in medium partial restoration of chiral symmetry
2009/10/29
We investigate the properties of the ηnucleus interaction by postulating the N*(1535) dominance for ηN system. Since the mass gap of N* and N is very close to the η meson mass, there is the possi...
C(γ,η)X反应与N*(1535)在核内的性质
N*(1535)模型 C(γ,η)X反应 反应截面
2009/7/30
在N*(1535)共振模型下,研究了γ在原子核上产生η的反应,通过N衰变的实验数据以及γp→ηp反应确定了模型参数,结果表明,MN*=1550MeV才较好地符合γp→ηp的实验,对12C上的η介子光生的总截面计算发现,N*(1535)在核内的宽度由于多体修正而增大,N*－核的相互作用具有排斥性质.
在相对论介子与核相互作用理论框架下, 对α(p,p')ηα反应进行了理论分析, 讨论了在入射质子和靶核上的N*(1535)激发机制的特点. 以4He靶核为例, 在入射质子动能Tp=2.8GeV的情况下, 计算了反应截面, 末态ηN不变质量谱和出射η介子的角分布, 讨论了在兰州重离子冷却储存环(CSR)上开展实验研究的意义和可能性.
Transverse Transition Form Factors from the Nucleon to Nucleonic Excitation States Δ(1232),
N*(1535) and
N*(1680)
constituent quark model electromagnetic
interaction transverse transition form factor
2007/8/15
2002Vol.37No.5pp.579-582DOI:
Transverse Transition Form Factors from the Nucleon to Nucleonic Excitation States Δ(1232),
N*(1535) and
N*(1680)
MA Wei-Xing,1,2 DONG Yu-Bing,2 and ...