Measurement of double-differential cross sections for top quark pair production in pp collisions at root s=8 TeV and impact on parton distribution functions

doi:10.1140/epjc/s10052-017-4984-5

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	Measurement of double-differential cross sections for top quark pair production in pp collisions at root s=8 TeV and impact on parton distribution functions
	CMS Collaboration
刊名	EUROPEAN PHYSICAL JOURNAL C
	2017
卷号	77 期号:7 页码:459
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-017-4984-5
文献子类	Article
英文摘要	Normalized double-differential cross sections for top quark pair (t (t) over bar) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 fb(-1). The measurement is performed in the dilepton e(+/-)mu(+/-) final state. The tt cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and tt system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured tt cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
电子版国际标准刊号	1434-6052
WOS关键词	3-LOOP SPLITTING FUNCTIONS ; LEADING ORDER ; LHC ; QCD ; SCATTERING ; DENSITIES ; EVOLUTION ; ERA
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000405244200001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284495]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	CMS Collaboration. Measurement of double-differential cross sections for top quark pair production in pp collisions at root s=8 TeV and impact on parton distribution functions[J]. EUROPEAN PHYSICAL JOURNAL C,2017,77(7):459.
APA	CMS Collaboration.(2017).Measurement of double-differential cross sections for top quark pair production in pp collisions at root s=8 TeV and impact on parton distribution functions.EUROPEAN PHYSICAL JOURNAL C,77(7),459.
MLA	CMS Collaboration."Measurement of double-differential cross sections for top quark pair production in pp collisions at root s=8 TeV and impact on parton distribution functions".EUROPEAN PHYSICAL JOURNAL C 77.7(2017):459.