Event patterns extracted from top quark-related spectra in proton-proton collisions at 8 TeV  

作　　者：陈亚慧 刘福虎 Roy A.Lacey 

机构地区：[1]Institute of Theoretical Physics & State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University [2]Departments of Chemistry & Physics,Stony Brook University

出　　处：《Chinese Physics C》2018年第3期1-17,共17页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11575103,11747319);the Shanxi Provincial Natural Science Foundation(201701D121005);the Fund for Shanxi"1331 Project"Key Subjects Construction and the US DOE(DE-FG02-87ER40331.A008)

摘　　要：We analyze the transverse momentum （PT） and rapidity （y） spectra of top quark pairs, hadronic top quarks, and top quarks produced in proton-proton （pp） collisions at center-of-mass energy √s=8 TeV. For PT spectra, we use the superposition of the inverse power-law suggested by the QCD （quantum chromodynamics） calculus and the Erlang distribution resulting from a multisource thermal model. For y spectra, we use the two-component Gaussian function resulting from the revised Landau hydrodynamic model. The modelling results are in agreement with the experimental data measured at the detector level, in the fiducial phase-space, and in the full phase-space by the ATLAS Collaboration at the Large Hadron Collider （LHC）. Based on the parameter values extracted from PT and y spectra, the event patterns in three-dimensional velocity （βx-βy-βz）, momentum （px-py-pz）, and rapidity （y1-y2-y） spaces are obtained, and the probability distributions of these components are also obtained. Keywords： top quark-related spectra, event pattern, three-dimensional spaceWe analyze the transverse momentum （PT） and rapidity （y） spectra of top quark pairs, hadronic top quarks, and top quarks produced in proton-proton （pp） collisions at center-of-mass energy √s=8 TeV. For PT spectra, we use the superposition of the inverse power-law suggested by the QCD （quantum chromodynamics） calculus and the Erlang distribution resulting from a multisource thermal model. For y spectra, we use the two-component Gaussian function resulting from the revised Landau hydrodynamic model. The modelling results are in agreement with the experimental data measured at the detector level, in the fiducial phase-space, and in the full phase-space by the ATLAS Collaboration at the Large Hadron Collider （LHC）. Based on the parameter values extracted from PT and y spectra, the event patterns in three-dimensional velocity （βx-βy-βz）, momentum （px-py-pz）, and rapidity （y1-y2-y） spaces are obtained, and the probability distributions of these components are also obtained. Keywords： top quark-related spectra, event pattern, three-dimensional space

关 键 词：top quark-related spectra event pattern three-dimensional space 

分 类 号：O572.2[理学—粒子物理与原子核物理]