The nuclear modification factor for prompt photon production in proton–nucleus collisions is investigated within color dipole formalism. By means of the Glauber–Gribov approach, the nuclear effects are studied in various rapidity bins with the evolution equation-based saturation models and the phenomenological dipole models. The theoretical results are compared with the experimental data provided by PHENIX, ATLAS and CMS Collaborations. At forward rapidity and midrapidity, a reasonable agreement with the experimental data is shown for the theoretical results with the modified Kharzeev, Levin and Nardi model, and the Kowalski and Teaney model. Then, we analyze the influence of the initial state energy loss effect on the nuclear modification factor and find that it is obvious only at backward rapidity together with small p T . Finally, the theoretical results are also compared with those of JETPHOX Monte Carlo program and the predictive results for the LHCb at very forward rapidities are presented.

高能质子-质子(p-p)和质子-原子核(p-A)碰撞过程中产生的D介子是分析碰撞后生成的饱和胶子性质的重要途经.考虑领头阶下的强耦合效应,在色玻璃凝聚理论(CGC)框架下研究了LHC(Large Hadron Collider,LHC)能量下p-p(p-A)碰撞过程中的D介子产生.采用由KLR-AdS/CFT色偶极模型通过傅里叶变换得到的偶极关联因子,同时利用Glauber模型考虑冷核物质效应,计算了质心能量为5.02 TeV时质子-铅核(p-Pb)碰撞中不同碰撞中心度下D介子的产生截面,并在此基础上研究了p-Pb碰撞中D介子产生及其半轻子衰变过程中的核修正因子.通过与大型强子对撞机(LHC)实验结果比较发现:考虑强耦合效应后的理论结果与ALICE和LHCb合作组的最新实验数据符合得更好.最后,本文对LHC碰撞质心能量为8.16 TeV时p-Pb碰撞中D介子产生的核修正因子给出了理论预言,结果显示此能量下核修正因子理论值比5.02 TeV时略大.

A method of Bucket detection is taken to determine the similarity between the detected object and the reference object by measuring the intensity correlation between the two detectors. This model is based on an optical theory and provides a theoretical way of realizing object recognition.

理论分析鬼成像的抗干扰原理;分别用塑料泡膜和装满自来水的矿泉水瓶作为障碍物,放置在物体与桶探测器之间,进行静态可透光障碍物对鬼成像影响的实验研究,结果表明障碍物对成像几乎不产生影响,这种成像方式确实具有一定的抗干扰特性。

By means of the gluon quantum saturation model based on super Yang-Mills theory and the Peterson fragmentation function,the D-meson production in deep inelastic ep（electron proton） scattering is investigated in the color glass condensate formalism.The calculations indicate the phenomenon that the charmed meson production cross section at LHeC（Large Hadron-electron Collider） energies does not depend on x may appear in small Q2 area.Finally,the predictive results of the D-meson production cross section versus transversal momentum are also given at LHeC energies and they will be validated by the LHeC experiment in the future.

The EIT effect in a double-Λ atomic ensemble is discussed.The eigenstates of the interaction Hamiltonian for a single atom are formulated under the condition of the correlated EIT and correlated two-signal absorption,respectively,which can explain the two effects reasonably.

In this paper,the J/ψ absorption cross-section is studied at different collision energies.It is shown that the change trends of the absorption cross-section versus xF are different at different collision energies.Especially,there is a visible change while xF≈0 at Large Hadron Collider(LHC) energies.Then,we calculate the ratio of the J/ψ production cross-section in d-Au collisions to those in p-p collisions by using this theory.The theoretical results are in good agreement with the experimental data from Phenix.Finally,we make theoretical prediction on the experimental results for LHC,which will be validated by the LHC experiment in the future.

结合对MIT研究型物理教学模式的研究,本文简要地分析了传统物理教学的窘境,提出了物理教学改革应着重抓紧解决的几方面问题.