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考虑了色单态和色八重态的贡献后,我们计算了固定靶情况下J/ψ和ψ′的产生截面.并把结果用来研究p–A碰撞中J/ψ压低和ψ′/ψ的产额比值问题.当–核子相互作用的截面对(cc)8取为σ8abs≈10mb,对(cc)1取为σ8abs≈0mb时,计算结果和实验数据符合得很好.推广此模型,考虑同行粒子对J/ψ的吸收,并用它来讨论A–A碰撞的情况,计算结果表明,在相同的条件下,这个模型不能同时解释S–U和Pb–Pb碰撞的实验结果.最后讨论了S–U和Pb–Pb碰撞中QGP形成的可能性. 相似文献
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《物理》编辑部:《物理》2004年第11期第826—831页《J/ψ粒子是由粲夸克和反粲夸克组成的束缚态的实验证明》一文(以下简称《J/ψ粒子》文)中存在多处错误及不够准确的地方,其中与文章主题直接相关的一些内容,即涉及J/ψ粒子家族3个成员——ηc(2S),hc(1P)及ηc(1S)态发现的叙述,更是与实际情况严重不符,需即予更正并及时提请读者注意。 相似文献
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本文用胶子结构函数的遮蔽效应和末态作用分析了在p-A碰撞中粲偶素和b夸克偶素产额压低的实验数据,较好地描述了粲偶素和b夸克偶素产额的压低与A和X2的关系. 相似文献
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本文用胶子结构函数的遮蔽效应和末态作用分析了在p-A碰撞中粲偶素和b夸克偶素产额压低的实验数据,较好地描述了粲偶素和b夸克偶素产额的压低与A和X2的关系. 相似文献
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叙述了J/Ψ粒子是由粲夸克和反粲夸克组成的束缚态的实验证明的历史过程,以及发现J/Ψ家族,一系列粲介子和粲重子的实验.人们可以从中获得有益的启示. 相似文献
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The mass spectrum and binding radii of heavy-quark bound states are analyzed in terms of the reduced Bethe-Salpeter equation. The critical values of screening masses for cc and bb bound states at finite temperature are obtained and compared with the previous results given by nonrelativistic models. 相似文献
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The probability of tunnel decay of quarkonium (bond state of a heavy quark and a heavy antiquark) into free quarks in a strong electric field is estimated. 相似文献
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Using the scale evolution of nuclear parton distributions,the contribution of color-octet heavy quarkonium production mechanism to the P + Fe → J/ψ + γ + X process in calculated and discussed.Comparing our theoretical results with the future experimental data,the color-octet heavy quarkonium production mechanism can be examined. 相似文献
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Using the scale evolution of nuclear parton distributions,the contribution of color-octet heavy quarkonium production mechanism to the P Fe → J/ψ γ X process in calculated and discussed.Comparing our theoretical results with the future experimental data,the color-octet heavy quarkonium production mechanism can be examined.`` 相似文献
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The charmonium and bottomonium mass spectra are investigated systematically in potential nonrelativistic QCD with the heavy quark potential computed by lattice QCD simulations nonperturbatively. The potential consists of a static potential and relativistic corrections classified in powers of the inverse of heavy quark mass m, and the effects of the O(1/m) correction, the O(1/m 2) spin–orbit and spin–tensor corrections on the mass spectra are examined systematically. The pattern of the mass spectra is found to be in fairly good agreement with the experimental data, in which the O(1/m) correction gives an important contribution. 相似文献
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Kuang Yu-ping 《Frontiers of Physics in China》2006,1(1):19-37
We review the developments of the multipole expansion approach in quantum chromodynamics and its applications to hadronic
transitions and some radiative decays of heavy quarkonia. Theoretical predictions are compared with updated experimental results. 相似文献
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In this article,we study the vector meson transitions among the charmonium and bottomonium states with the heavy quark effective theory in a systematic way,and make predictions for the ratios among the vector meson decay widths of a special multiplet to another multiplet.The predictions can be confronted with the experimental data in the future. 相似文献
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自旋相关的相对论修正对有限温度下重夸克偶素的结合和分解的影响进行了讨论,结果表明精细和超精细相互作用特影响对重夸克偶素性质的预言,特别是对ηc和J/ψ起着明显的作用. 相似文献
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Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN* (1440), decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions are given explicitly. Quark mass effects on the violation of the helicity conservation and the prospect to look for them in J/ψ hadronic decays are discussed. 相似文献
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介绍了量子场论中基于准势途径的一个相对论夸克模型,并使用这个相对论夸克模型计算了重夸克偶素的质量谱.显示这个相对论夸克模型可较好地拟合实验上肯定的质量谱数据. A relativistic quark model based on the quasipotential approach in quantum field theory is briefly introduced, and by using this model, heavy quarkonium mass spectra are calculated in detail. It is shown that such a model can give results which are in agreement with the observed experimental data on the mass spectra. 相似文献