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

We analyze the transverse momentum(p _T)and rapidity(y)spectra of top quark pairs,hadronic top quarks,and top quarks produced in proton-proton(pp)collisions at center-of-mass energys~(1/2)=8 Te V.For p _(T )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 p _(T )and y spectra,the event patterns in three-dimensional velocity(β_x-β_y-β_z),momentum(p_x-p_y-p_z),and rapidity(y_1-y_2-y)spaces are obtained,and the probability distributions of these components are also obtained.     

局域表面等离子体谐振辅助的高效率宽频带可调谐偏振转换超表面

结合狄拉克半金属研究了一种基于各向异性构型的可调谐宽频带太赫兹偏振转换超表面,其中的狄拉克半金属线阵列有利于费米能的调控.研究结果表明,该超表面可以实现宽带高效率的偏振转换,在谐振模式处具有半波片特性.这种转换特性源于局域表面等离子体激元谐振的激发和结构自身的各向异性.当入射角在0°—40°范围内变化时,能保持高效的宽带偏振转换特性,大于40°后,宽带转换逐渐转变为双带或多带转换.此外,发现AlCuFe的费米能从65 meV增大至140 meV过程中,偏振转换效率能维持在很高水平,并且转换性能由单带转换变为宽带转换再变为带较宽的宽带转换与带较窄的单带转换.同时,通过讨论结合了不同类型狄拉克半金属的超表面,得出了狄拉克半金属的金属性越好,相应超表面的宽带偏振转换性能越优的结论.最后,基于类法布里-珀罗谐振腔的多重干涉理论对数值结果进行了验证.