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sqrt(s)= 7 TeV pp碰撞中Z +喷流事件的形状和方位角关联

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

CMS Collaboration

摘要:

测量事件的形状和方位角的相关性的事件中产生的Z玻色子与质子-质子碰撞中的喷流。在欧洲核子研究中心的大型强子对撞机上,用CMS探测器在sqrt(s)= 7 TeV收集的数据对应于5.0毫微微巴恩斯的积分亮度。分析提供了一个测试的预测微扰QCD的过程,代表了大量的背景,许多物理通道。结果作为一个函数的喷气多重性,包容性Z玻色子生产和Z玻色子的横动量大于150 GeV,相比,预测从蒙特卡洛事件发生器,包括领先阶多部分子矩阵元素(最多有四个硬部分子在最终状态)和下一个领先阶模拟Z + 1喷气事件。实验结果对探测器效应作了修正,并可直接与其它QCD模型进行比较。

英文摘要:

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.

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