Anthony J. Baltz, Joakim Nystrand
Lowest order and higher order QED calculations have been carried out for the RHIC high mass e+ e- pairs observed by PHENIX with single ZDC triggers. The lowest order QED results for the experimental acceptance are about two standard deviations larger than the PHENIX data. Corresponding higher order QED calculations are within one standard deviation of the data.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
Evidence for higher order QED in e+ e- pair production at RHIC
对在STAR ZDC触发器中观测到的重离子核库仑离解进行唯象处理，对RHIC e~+ e~-对产生进行了一种新的最低阶QED计算。最低阶QED结果的实验可接受性比STAR数据大近两个标准差。相应的高阶QED计算结果与实验数据一致。
We extract the effective degrees of freedom that characterize the co-existing phase of quark gluon plasma and hadrons. Experimental data on phi at mid-rapidity is used to set a lower bound to the critical temperature of quark hadron phase transition. The production and evolution of strangeness have been studied by using Boltzmann equation. The results have been contrasted with the experimental data obtained by STAR collaboration at RHIC for Au + Au collisions at sqrt{s_{NN}}=200 GeV. Our study reveals that the phi mesons freeze out at a temperature ~ 160 MeV, a value close to the transition te…
Forward hadron production in high energy pA collisions: from RHIC to LHC
本文基于胶子饱和的KKT模型，计算了RHIC和LHC能区Pi、D和B介子的产生。讨论了核修正因子对快度和横动量的依赖关系。
Particle Production in Proton-Proton and Deuteron-Gold Collisions at RHIC
我们试图了解最近的数据质子质子和氘金碰撞在RHIC，采用部分子模型方法称为EPOS。
Strange particle production at RHIC in a single-freeze-out model
奇异粒子比和pT谱计算在一个热模型与单一的冻结，以前成功地用来描述非奇异粒子生产RHIC。该模型与最近公布的φ、λ、反λ和K ~*（892）的数据符合得非常好，表明热方法可以用来描述RHIC的奇异值产生。
Jet energy loss, photon production and photon-hadron correlations are studied together at high transverse momentum in relativistic heavy-ion collisions at RHIC energies. The modification of hard jets traversing a hot and dense nuclear medium is evaluated by consistently taking into account induced gluon radiation and elastic collisions. The production of high transverse momentum photons in Au+Au collisions at RHIC is calculated by incorporating a complete set of photon-production channels. Comparison with experimental photon production and photon-hadron correlation data is performed, using a (…
QCD Predictions for Charm and Bottom Production at RHIC
我们对\sqrt{S} = 200 GeV的核子-核子碰撞中RHIC的开粲和底产生作了最新的QCD预言。我们还计算了电子光谱导致重味衰变，以允许直接比较的数据。一个严格的基准，包括理论上的不确定性，建立了核碰撞数据可以比较，以获得核效应的证据。
$ϕ$ meson production and partonic collectivity at RHIC
回顾了RHIC 2004年第四次运行中关于$ϕ$介子产生和椭圆流$v_{2}$测量的新结果。此外，还模拟了凝聚态$ϕ$和$Ω$与伴随软粒子之间的双强子关联函数.这些结果的知识进行了讨论。
Transverse Energy Production at RHIC
本文研究了RHIC上Au+Au碰撞中横能产生的机制。在输运模型中，我们仔细研究了从初始能量损失到最终E_T产生的时间演化。讨论了实验测得的E_T分布与所获得的最大能量密度之间的关系。
Dilepton Production at Fermilab and RHIC
本文介绍了费米实验室几个固定靶双μ子产生实验的最新结果。特别地，我们讨论了利用Drell-Yan数据来确定核子海的味结构，以及推导部分子穿越核介质的能量损失。未来在RHIC的双轻子实验可能会对核子海的味不对称性和可能的电荷对称性破坏有更多的了解。在RHIC中也可以发现Drell-Yan过程中标度破坏的明确证据。
Entropy Production at RHIC
对于RHIC能区的中心重离子碰撞，利用极小模型，从实验测量的粒子产额、光谱和由双粒子干涉法估算的源尺寸中，提取了冻结时的单位快度熵dS/dy.提取的熵快度密度与格点规范理论的结果是一致的热化夸克-胶子等离子体的能量密度估计从横向能量产生在RHIC。
(ΩΩ)_{0^+} dibaryon productions in central Au+Au collisions at RHIC energy \sqrt {s_{NN}} =130GeV
在RHIC能量\sqrt { s_{NN} } = 130 GeV下，利用π^-、K^-和\bar p的横质谱测量结果，研究了强子物质中重子-重子反应的二ω产生.计算结果表明，在RHIC能区可以观察到深度束缚态（ΩΩ）_{0^+}。
Strangeness Production at RHIC in the Perturbative Regim
本文在部分子级联模型（PCM）框架下研究了RHIC上Au-Au碰撞中奇异夸克的产生。的产量（反）奇夸克的三个生产方案-初级初级散射，全散射，并充分生产-质子质子基线进行了比较。与标度p-p碰撞相比，中心Au-Au碰撞中奇夸克产额的增加随着次级相互作用的数量而增加。研究了三种生产方案下奇异性生产的中心性依赖性。对于所有的产生机制，奇异产额随着$(N_{\rm part})^{4/3}$的增加而增加。由PCM描述的微扰QCD机制能够解释RHIC中观测到的奇异性的50%。
We calculate the contribution of the two photon production process into $e^+e^-$ spectra, and compare the results with experimental data from the PHENIX detector at RHIC. We study the contribution given by ``semi-coherent" kinematics, in which one photon is relatively hard and is incoherently emitted by participating protons, while another can be soft enough to be in a coherent domain.
The motion of charmonium in heavy ion collisions is described by a three dimensional transport equation with initial production and continuous regeneration in hot medium. The observation of apparently stronger $J/ψ$ suppression at forward rapidity compared to that at midrapidity, so called $J/ψ$ puzzle at RHIC, can well be explained by the competition between the two production mechanisms. At LHC, however, the rapidity dependence of the $J/ψ$ production is dominated by the regeneration process.
We calculate the rapidity dependence of $J/ψ$ nuclear modification factor and averaged transverse momentum square in heavy ion collisions at RHIC in a 3-dimensional transport approach with regeneration mechanism.
High-p_T Pion Production in Heavy-Ion Collisions at RHIC energies
给出了从CERN SPS到RHIC能区质子-质子、质子-核和核-核碰撞中π介子产生的微扰QCD结果。应用从射流产生中得到的K_{jet}（s，p_T，Q）因子进行次-首阶计算。利用内禀横动量（k_T），我们确定了宽能区π介子的横动量谱。我们研究了RHIC能区核的多重散射和克罗宁效应。
Predictions of the Generalized Glauber Model for the coherent $ρ$-production at RHIC and the STAR data
利用广义矢量占优模型（GVDM）和Gribov-Glauber方法计算了$\surd s_{NN}=130$ GeV重离子超周边碰撞（UPC）中相干和非相干$ρ$ -产生的快度分布和总截面.我们发现$ρ$ -生产$σ_{coh}=490$ MB的相干横截面相比，$σ_{coh}=370\pm 170\pm 80$ MB最近报告的星合作在RHIC。实验验收内的预测横截面$|y|\le 1$与数据一致。强调的是，测量的快度分布将提供一个更严格的测试模型。
Phi-Meson Production at RHIC, Strong Color Fields and Intrinsic Transverse Momenta
研究了RHIC超相对论重离子碰撞中强色场和相应的增强内禀横动量对φ介子产生的影响。观察到的结果包括光谱斜率的变化，不同的粒子比，也修改平均横动量。特别是，组成的生产过程中的phi介子，即直接生产与聚结类生产，强烈依赖于强度的色场和固有的横动量，因此代表了一个敏感的探针，为他们的测量。
Photon induced proton and anti-proton pair production with ultraperipheral heavy ion collisions at RHIC
本文利用联合碰撞参数与横动量依赖形式体系，研究RHIC超周边重离子碰撞中通过光子-光子融合产生质子-反质子对的过程，并给出可供未来实验检验的微分分布预言。
The production of charm mesons from quark matter at CERN SPS and RHIC
我们研究了在CERN SPS和RHIC能量下从夸克物质中产生粲介子和其它粲重子的过程。用夸克并合模型作为强子化机制，我们预言了粒子比、绝对产额和横动量谱。
We study dielectron production in proton-proton collisions at top RHIC beam energy within an extended statistical hadronization model. The invariant mass spectrum of correlated dielectron pairs is evaluated in the low invariant mass region and calculated results are compared with the PHENIX experiment. The model is found to be able to describe the data very well up to invariant masses of 1 GeV with few adjustable parameters.
In this letter we update our predictions for the photoproduction of vector mesons in coherent $pp$ and $AA$ collisions at RHIC and LHC energies using the color dipole approach and the Color Glass Condensate (CGC) formalism. In particular, we present our predictions for the first run of the LHC at half energy and for the rapidity dependence of the ratio between the $J/Ψ$ and $ρ$ cross sections at RHIC energies.
New experimental data on transverse momentum spectra of strange particles (KS0, K-, K*, phi,...) produced in pp collisions at sqrt s = 200 GeV obtained by the STAR and PHENIX collaborations at RHIC are analysed in the framework of z-scaling approach. Scaling properties of the data z-presentation are illustrated. Self-similarity of strange particle production is discussed. A microscopic scenario of constituent interactions developed within the z-scaling approach is used to study constituent energy loss, proton momentum fraction and recoil mass in dependence on the transverse momentum, strangene…
Forward and midrapidity charmonium production at RHIC
在相对论重离子对撞机（RHIC）的正快度和中快度的$J/ψ$生产是在一个先前构建的速率方程的方法内计算的直接生产和再生从$c$和$\bar c$。结果与实验数据进行了比较。在前向快度观测到的较强的抑制可以定性地解释为一个较小的统计再生成分，以及较强的冷核物质诱导的抑制相比，中快度。还计算了$χ_c$与$J/ψ$的比值和$ψ'$与$J/ψ$的比值。
Upsilon production in heavy ion collisions at RHIC energy is investigated. While the transverse momentum spectra of the ground state Upsilon(1s) are controlled by the initial state Cronin effect, the excited $b\bar b$ states are characterized by the competition between the cold and hot nuclear matter effects and sensitive to the dissociation temperatures determined by the heavy quark potential. We emphasize that it is necessary to measure the excited heavy quark states in order to extract the early stage information in high energy nuclear collisions at RHIC.
$J/ψ$ suppression/production is one of the main signature of quark-gluon plasma detection at RHIC and LHC. In order to study $j/ψ$ suppression/production in high energy heavy-ion collisions at RHIC and LHC, one needs to prove the factorization theorem of $j/ψ$ production in non-equilibrium QCD medium, otherwise one will predict infinite cross section of $j/ψ$. In this paper we prove factorization theorem of $j/ψ$ production in non-equilibrium QCD at RHIC and LHC at all order in coupling constant.
Baryon and Antibaryon production at RHIC energies in the Dual Parton Model
在补充末态相互作用的双部分子模型中，计算了$\sqrt{s}$ = 130 GeV的$Au$- $Au$碰撞中π介子、K介子、重子和反重子的中快度密度，并与已有的数据进行了比较.
Bottom and Charm Production at LHC and RHIC
我们研究了LHC和RHIC能区的$b\bar{b}$和$c\bar{c}$的产生以及核遮蔽的影响。我们发现在RHIC和LHC中，Charm和Bottom的产生截面都有显著的减少。束缚态如$Υ$和$J/Ψ$被这种魅力产生截面的减小所抑制。因此，$J/Ψ$抑制可能不能作为夸克-胶子等离子体的特征信号。
Pion production in d+Au collisions at RHIC energy
本文给出了在RHIC能区pp和dAu碰撞中中性π_i ~ 0产生的结果。π介子谱是在一个次领先阶（NLO）微扰QCD为基础的模型计算。该模型包括初始部分子分布的横向分量（"本征kT“）。我们比较了我们的结果从RHIC的实验数据，并拟合数据具有较高的精度。以这种方式调整的计算重复dAu碰撞，并用于调查的阴影和多重散射在RHIC的相互作用。核修正因子的中心性依赖性在不同的遮蔽参数化之间表现出可测量的差异。
Centrality dependence of strangeness and (anti)hyperon production at BNL RHIC
我们评估了在$\sqrt{s_{\rm NN}}=200$ GeV的Au-Au相互作用中产生的奇异性，作为反应参与者数$A$的函数，并获得了强子化时的相对奇异夸克含量。研究了奇异重子和反重子快度密度产额与参与者数和强子产额的关系。
Prompt Photon and Inclusive $π^0$ Production at RHIC and LHC
我们给出了RHIC和LHC能区p-p和A-A碰撞中的瞬发光子和包含$π^0$产生的结果。我们考虑了次领先级辐射修正和核效应，如核遮蔽和部分子能量损失。我们发现下一个领先的顺序更正是大的和$p_T$依赖。我们展示了如何测量的$π^0$生产在RHIC和大型强子对撞机，在大$p_T$，可以提供有价值的信息的性质部分子能量损失。我们计算的比率提示光子中性π介子，并表明，在RHIC的能量，这一比例增加与$p_T$接近一个在$p_T \sim 10$ GeV，由于大的抑制$π^0$生产。我们发现，在大型强子对撞机，这个比例有陡峭的$p_T$的依赖性和接近10%的效果在$p_T \sim 20$ GeV。
We briefly review the existing psi(2S) data taken at RHIC, the Tevatron and the LHC. We systematically compare them with colour-singlet-model predictions as a function of the center-of-mass energy, of the quarkonium rapidity and of the quarkonium transverse momentum. The overall agreement is good except for large transverse momenta. This points at the existence of large NNLO corrections or points at colour-octet dominance.
Recently we have proved the factorization of NRQCD S-wave heavy quarkonium production at all orders in coupling constant. In this paper we extend this to prove the factorization of infrared divergences in $χ_{cJ}$ production from color singlet $c{\bar c}$ pair in non-equilibrium QCD at RHIC and LHC at all orders in coupling constant. This can be relevant to study the quark-gluon plasma at RHIC and LHC.
Recently we have proved the NRQCD factorization in heavy quarkonium production at high energy colliders at all orders in coupling constant. In this paper we extend this to non-equilibrium QCD and prove the NRQCD factorization in heavy quarkonium production at all orders in coupling constant in non-equilibrium QCD. This proof is necessary to study heavy quarkonium production from quark gluon plasma at RHIC and LHC.
We assess the theoretical uncertainties on the inclusive J/psi production cross section in the Color Evaporation Model (CEM) using values for the charm quark mass, renormalization and factorization scales obtained from a fit to the charm production data. We use our new results to provide improved baseline comparison calculations at RHIC and the LHC. We also study cold matter effects on J/psi production at leading relative to next-to-leading order in the CEM within this approach.
We investigate inclusive prompt photon and semi-inclusive prompt photon-hadron production in high energy proton-nucleus collisions using the Color Glass Condensate (CGC) formalism which incorporates non-linear dynamics of gluon saturation at small x via Balitsky-Kovchegov equation with running coupling. For inclusive prompt photon production, we rewrite the cross-section in terms of direct and fragmentation contributions and show that the direct photon (and isolated prompt photon) production is more sensitive to gluon saturation effects. We then analyze azimuthal correlations in photon-hadron …
Recently we have proved NRQCD color octet factorization of S-wave and P-wave heavy quarkonia production at all orders in coupling constant in QCD in vacuum at high energy colliders in Eur. Phys. J. C76 (2016) 448 and in arXiv:1807.04722 [hep-ph] respectively. In this paper we extend this to prove NRQCD color octet factorization of P-wave heavy quarkonium production in non-equilibrium QCD at RHIC and LHC at all orders in coupling constant. This proof is necessary to study the quark-gluon plasma at RHIC and LHC.
Statistical hadronization of charm at SPS, RHIC and LHC
我们在统计强子化模型的框架下研究了SPS、RHIC和LHC能区核-核碰撞中粲夸克和粲强子的产生。从这个模型的结果进行了比较，观察到的J/psi生产SPS能量的中心性依赖。我们进一步预测了在RHIC和LHC中产生的开粲介子和隐粲介子的中心依赖性。
Rapidity dependence of large-p_t hadron production at RHIC
研究了RHIC超相对论核碰撞中部分子能量损失（猝灭）对快度的依赖性。这可以提供关于介质密度的宝贵信息，介质应该在远离中快度时更加稀释，从而减少淬灭的影响。我们预测在中等横向动量$\sim$ 3 GeV的一个明确的效果。
Limiting fragmentation and $ϕ$ meson production at RHIC
利用强子-弦级联模型LUCIAE研究了PHOBOS极限碎裂等RHIC上$Au+Au$碰撞中带电多重数的三个经验标度规则。对$ϕ$介子进行了类似的研究，通过与带电多重性的比较，探讨了它的产生机制。LUCIAE的带电多重性结果与PHOBOS的观测结果是一致的。然而，对于$ϕ$介子，LUCIAE计算中的三个经验标度规则要么只保留了，要么更好地保留了，而没有额外引入$s$夸克抑制的约化机制.这些结果似乎表明了弦碎裂区带电粒子和$ϕ$介子的普遍产生机制。讨论了PHOBOS的经验标度规则确实是模型依赖的。
Hadron production from quark coalescence and jet fragmentation in intermediate energy collisions at RHIC
在一个包含夸克从稠密部分子物质中聚并和微喷流猝灭部分子碎裂的模型中，研究了中RHIC能量为$\sqrt{s_{NN}}=62$ GeV的Au+Au碰撞中π介子、质子和反质子的横动量谱.由此产生的重子介子比在中间横动量的预测是大于实验中看到的更高的质心能量。
Charmonium Production at High $p_t$ at RHIC
计算了RHIC下$Au$ - $Au$和$Cu$ - $Cu$碰撞中$J/ψ$的横动量谱和椭圆流。我们采用了早期构建的直接和再生charmonia，这是相当一致的包容性$J/ψ$产量在SPS和RHIC的中心依赖的2-组件的方法。在$Cu$ - $Cu$碰撞中，通过实现有限形成时间的影响和对$B$介子反馈的估计，解决了高$p_t$数据的离散性问题，在很大程度上解决了这个问题.研究了光谱对克罗宁效应和不同介质解离速率的敏感性。在半中心$Au$ - $Au$碰撞中，预言的椭圆流相当小，$\sim$为2- 3%.
The parton and hadron cascade model PACIAE is used to investigate strange particle production in Au + Au collisions at GeV in different centralities and at 39, 11.5 and 7.7 GeV in the most central collision, respectively. It is shown that the transverse momentum distributions of strange particles by the PACIAE model fit the RHIC Beam Energy Scan experimental results well.
The structure of the QED-Vacuum and Electron-Positron Pair Production in Super-Intense, pulsed Laser Fields
我们讨论了电子-正电子对生产的超强，短激光脉冲的物理真空态局部变形的（剥离）核与大的核电荷。由这种变形所引起的非微扰真空极化的后果，很快被提出。计算每个脉冲的产生概率。
Relating RHIC and SPS Heavy Ion Data
我们最近已经证明，RHIC重离子数据有关的粒子生产在小和中间横动量变得非常透明，如果一个人意识到有两个来源的粒子生产：电晕-由于任何一个核的周边核子的相互作用，和核心-代表高密度中心区。我们扩展我们的分析SPS重离子数据。再次，我们发现，粒子生产的非平凡的中心性依赖（比RHIC强）仅仅是由于增加日冕贡献与中心性降低。核心贡献没有显示出中心性依赖性（关于粒子比），并且可以与RHIC完全相同的方式描述，但有一个例外：与RHIC相比，SPS的集体径向流要少一些。除此之外（和一个微不足道的体积效应），在不同能量（RHIC，SPS）的不同碰撞系统中产生的核心部分看起来是一样的。
We discuss the production of $D$-mesons and $J/ψ$ in high multiplicity proton-proton and proton-nucleus collisions within the Color-Glass-Condensate (CGC) framework. We demonstrate that the modification of the LHC data on $D$ and $J/ψ$ yields in high multiplicity events relative to minimum bias events arise from a significant enhancement of the gluon saturation scales of the corresponding rare parton configurations in the colliding protons and nuclei. For a given event multiplicity, we predict these relative yields to be energy independent from $\sqrt{s}=200$ GeV at RHIC to the highest LHC ene…
A higher order QED calculation of the ultraperipheral heavy ion cross section for mu+ mu- pair production at RHIC and LHC is carried out. The so-called "Coulomb corrections" lead to an even greater percentage decrease of mu+ mu- production from perturbation theory than the corresponding decrease for e+ e- pair production. Unlike the e+ e- case, the finite charge distribution of the ions (form factor) and the necessary subtraction of impact parameters with matter overlap are significant effects in calculation an observable ultraperipheral mu+ mu- total cross section.
The production and space-time evolution of charm and bottom quarks in nucleus-nucleus collisions at RHIC and LHC are investigated with the partonic transport model BAMPS (Boltzmann Approach of MultiParton Scatterings). Heavy quarks, produced in primary hard parton scatterings during nucleon-nucleon collisions, are sampled using the Monte Carlo event generator PYTHIA or the leading order mini-jet model in conjunction with the Glauber model, revealing a strong sensitivity on the parton distribution functions, scales, and heavy quark mass. In a comprehensive study exploring different charm masses…
Charmonium Production off Nuclei: from SPS to RHIC
核碰撞中粲偶素抑制的物理性质在SPS和RHIC的能量之间有很大的变化。综述了SPS条件下抑制Charmonia的机制，这两种机制在RHIC条件下都不重要。另一方面，相干性，或在SPS中几乎看不到的c-夸克和胶子的阴影，成为RHIC中的主导效应，提供了更强的抑制。在费米实验室能量下的相干性解释了观测到的截面比在大费曼x_F下急剧下降。在核碰撞中，粲偶素抑制随x_F的变化是QGP的灵敏探针.
Differences in high p_t meson production between CERN SPS and RHIC heavy ion collisions
本文介绍了用微扰QCD改进的部分子模型计算高能重离子碰撞中轻介子的产生。为了更好地描述实验数据，需要在标准pQCD模型中加入部分子的横向动量分布（“内禀k_T”）。质子核数据表明存在核遮蔽和多重散射效应。在核-核碰撞中需要进一步的修正来解释观察到的截面的减小。我们介绍了质子离解的概念，并将我们的计算结果与SPS和RHIC的实验数据进行了比较。
I discuss Upsilon production in pp collisions at RHIC, Tevatron and LHC energies, in particular the behaviour of the differential cross section in rapidity and the impact of QCD corrections on the P_T differential cross section. I also emphasise the very good agreement between the parameter-free predictions of the Colour-Singlet Model (CSM) and the first LHC data, especially in the region of low transverse momenta, which is the most relevant one for heavy-ion studies. I also show that the CSM predicts Upsilon cross-section ratios in agreement with the most recent LHC data. I then briefly discu…
The parton and hadron cascade model PACIAE based on PYTHIA was utilized to systematically investigate the strange particle production in pp collisions at the RHIC and LHC energies. Taking the mechanism of reduction of the strange quark suppression into account the STAR and ALICE data of strange particle production in pp collisions are well reproduced. It turned out that the K/π ratio as a function of reaction energy in pp collisions shows slightly increasing from sqrt(s)=0.2 to 0.9 TeV and then turning to saturation.
Unintegrated parton distributions and pion production in $pp$ collisions at SPS and RHIC energies
首次完全基于未积分胶子、夸克和反夸克分布（uPDF）计算了$pp$碰撞中π介子产生的包含截面.我们使用最近开发的Kwiecienski uPDF的和不同的现象学碎片功能（FF）的文献。除了$gg \to g$图，我们还包括$g q \to q$和$q g \to q$图的包容部分子生产。然后将包含的部分子分布和FF进行卷积，得到π介子的截面。SPS和RHIC的应用。
The features of net baryon productions and collective flow in relativistic heavy-ion collisions at energies reached at the CERN Large Hadron Collider (LHC), BNL Relativistic Heavy Ion Collider (RHIC), CERN Super Proton Synchrotron (SPS) and BNL Alternating Gradient Synchrotron (AGS) with the model of Non-Uniform Flow Model(NUFM) are systematically studied in this paper. Especially we predict the feature of net baryon productions and collective flow at LHC $\sqrt{s_{NN}}$=5500 GeV basing on the detailed study of that at RHIC $\sqrt{s_{NN}}$=62.4 and 200GeV. The dependencies of the features of b…
PACIAE, a parton and hadron cascade model, is utilized to systematically investigate strange particle production and strangeness enhancement in Au+Au collision and in Pb+Pb collision with the 200GeV at RHIC and 2.76TeV at LHC, respectively. The experimental results at different centrality, which come from the STAR collaboration and the ALICE collaboration, are well described by the PACIAE model. This may represent the importance of the parton and hadron rescatterings, as well as the reduction mechanism of strange quark suppression, added in the PACIAE model.
We attempt, in this paper, to deal with the direct photon production phenomena in $p+p$, $d+Au$ and $Au+Au$ collisions at RHIC energy, $\sqrt{s_{NN}}$ = 200 GeV and in $Pb+Pb$-collisions at LHC energy, $\sqrt{s_{NN}}$ = 2.76 TeV on the basis of a non-standard framework outlined in the text. Comparisons of the model-based results with the measured data on some observables reveal fair agreement; and they are modestly consistent with the results obtained by some other models of `Standard' framework.
Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC and LHC
我们在统计强子化模型的框架下研究了SPS、RHIC和LHC能区核-核碰撞中粲夸克和粲强子的产生。从这个模型的结果进行了比较，在SPS和RHIC能量的J/psi生产的实测产量和中心依赖性。我们探讨和对比的中心依赖性的介子的生产与公开和隐藏的魅力在SPS，RHIC和LHC。详细分析了RHIC能量计算结果对各种输入参数的敏感性。
Chi_2 production in polarized pp collisions at RHIC: measuring ΔG and testing the color octet model
在基于QCD多极展开的有效理论框架下，研究了RHIC中极化和非极化$pp$碰撞中$χ_2$粲偶素态的产生和衰变。我们发现，在非极化的情况下，产生的粲偶素，$χ_2 \to J/ψ+ γ$，在衰变的角分布，使我们能够区分清楚的颜色单线态和颜色八重态的生产机制。一旦知道了产生机制，极化情况下的角分布就可以用来测量质子中极化胶子的分布，$ΔG(x)$。
Photon production in relativistic nuclear collisions at SPS and RHIC energies
手征拉格朗日量被用来计算相对论核碰撞强子相的光子产生率。特别注意赝矢量a_1介子的作用。计算包括与奇异介子、强子形状因子和与双轻子产生一致的矢量谱密度的反应，以及来自夸克-胶子等离子体和原始核子-核子碰撞的发射，再现了在超级质子同步加速器（SPS）测量的光子谱。对相对论重离子对撞机（RHIC）进行了预测。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。