标题： 事件形状和 azimuthal 相关性在 pp 碰撞中 Z + 粒子事件的 sqrt(s) = 7 TeV 显示英文标题

标题： Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) = 7 TeV

摘要： 事件形状和方位角相关性的测量结果在质子-质子碰撞中产生Z玻色子并与喷注相关的事件中给出。 在CERN LHC上使用CMS探测器收集的数据，sqrt(s) = 7 TeV，对应于5.0 inverse femtobarns的积分亮度。 该分析对一种代表许多物理通道的重要背景过程的微扰QCD预测进行了测试。 结果按喷注数量进行展示，包括包容性Z玻色子产生以及横动量大于150 GeV的Z玻色子，并与包含领先阶多部分子矩阵元（最终态最多四个硬部分子）和Z + 1喷注事件的下一阶模拟的蒙特卡罗事件生成器的预测进行了比较。 实验结果已校正探测器效应，可以直接与其他QCD模型进行比较。 显示英文摘要

摘要： Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models.