We study the transverse momenta and (pseudo)rapidity spectrum of the top quark and their decay products, the tt-system, and the total number of jets in proton-proton (pp) collisions at 13 TeV by using the Tsallis-Pareto-type function and the three-source Landau hydrodynamic model, respectively. The related parameters, such as the effective temperature of the interacting system (T), the non-extensivity of the process (n) and the width ($σ$) of (pseudo)rapidity distribution are extracted.
We report recent results on the extraction of the rapidity evolution kernel for Sudakov processes from experimental measurements of Drell-Yan (DY) transverse momentum distributions. We discuss the role of high-precision Large Hadron Collider (LHC) data, and illustrate the interplay of this analysis with transverse momentum dependent and collinear parton density functions.
School of Physics and Astronomy, China West Normal Universty(西华师范大学物理与天文学院);School of Physics and Electronic Engineering, Sichuan University of Science and Engineering(四川理工学院物理与电子工程学院);Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University(华中师范大学夸克与轻子物理教育部重点实验室及粒子物理研究所)
Rapidity gap survival factors caused by remnant fragmentation for $W^+ W^-$ pair production via $γ^*γ^* \to W^+ W^-$ subprocess with photon transverse momenta
我们计算了$p p \to W^{+} W^-$在最近开发的$k_{\rm T}$ -因式分解方法,包括横动量的虚光子的截面。我们专注于单质子和双质子解离的过程。首先,我们在部分子水平上讨论了由于额外喷注的发射而引起的能隙的存活。价和海的贡献的作用进行了讨论。本文用{PYTHIA 8}弦碎裂模型对质子的强子化进行了研究,假设质子是一个简单的夸克-双夸克模型。高度激发的残余系统强子化产生的粒子可以在量热计中被否决。我们计算相关的有效间隙生存因子。能隙的存活因子取决于过程、剩余系统的质量和碰撞能量。双解离(DD)碰撞($S_{R,DD}$)的剩余碎片引起的快度间隙存活因子小于单解离(SD)过程($S_{R,SD}$)。我们观察到的近似因式分解$S_{R,DD} \approx (S_{R,SD})^2$,但预计这一属性将违反软重散射效应不占在这封信中。
Charged multiplicity distribution in a pseudo-rapidity window is formulated under the assumption that the charge conservation is satisfied in the full phase space. At first, we analyze measured charged particle multiplicity distributions in pseudo-rapidity windows in LHC by CMS and ALICE collaborations with the two probability distributions. One is the convolution of negative binomial and Poisson distributions, and the other is the Glauber-Lachs formula. Each distribution is considered as an analogy of the quantum optics. Next, we analyze the data with the double GL formulae for $|η|<2.4$ at 7…
W-Jet Rapidity Correlations in $p\bar p$ Collisions at $\sqrt{s}=1.8$ TeV
D 0利用与高$p_T$喷流有关的W -> e nu事件来检验强辐射修正的影响。我们比较了主喷流的赝快度分布,作为重建的W快度的函数,以领先阶(LO)和下一个领先阶(NLO)QCD Monte Carlos,以及基于扩展色偶极子的模型。我们的初步分析发现,主射流是更中心的LO或NLO的预期,是在定性的协议与颜色偶极子模型。
We investigate different final state features in Mueller-Navelet jets events at hadron colliders. The focus lies on the average rapidity ratio between subsequent minijet emissions which has been investigated in previous works but now is modified to also incorporate the transverse momenta together with the rapidities of the emitted jets. We study the dependence of this observable on a lower transverse momentum veto which does affect the typical minijet multiplicity of the events under scrutiny. We find that this observable is stable when including higher order quantum corrections, also when col…
Pseudo-rapidity Distributions of Charged Hadrons in pp and pA Collisions at the LHC
在彩色玻璃凝聚框架下,利用GBW模型的UGD函数,研究了LHC pp和pA碰撞中带电强子的赝快度分布。对$\sqrt{s}=0.9,~2.36,~7$ TeV pp碰撞的CMS数据进行了$χ^{2}$分析,得到了归一化因子,理论结果与实验数据符合得很好.然后,考虑核子硬部分子分布对碰撞参与者数的影响,用Glauber Monte Carlo方法给出了$\sqrt{s}=4.4$ TeV p+Pb碰撞多重数分布的预测结果.