Measurement of associated Z plus charm production in proton-proton collisions at root s=8TeV

doi:10.1140/epjc/s10052-018-5752-x

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	Measurement of associated Z plus charm production in proton-proton collisions at root s=8TeV
	CMS Collaboration
刊名	EUROPEAN PHYSICAL JOURNAL C
	2018
卷号	78 期号:4 页码:287
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-018-5752-x
文献子类	Article
英文摘要	A study of the associated production of a Z boson and a charm quark jet (Z + c), and a comparison to production with a b quark jet (Z + b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb(-1), collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with pT(l) > 20 GeV, vertical bar eta(l)vertical bar < 2.1, 71 < m(ll) < 111 GeV, and heavy flavour jets with p(T)(jet) > 25 GeV and vertical bar eta(jet)vertical bar < 2.5. The Z + c production cross section is measured to be sigma(pp -> Z + c + X) B(Z -> l(+)l(-)) = 8.8 +/- 0.5 (stat)+/- 0.6 (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be sigma(pp -> Z+c+X)/sigma (pp -> Z+b+X) = 2.0 +/- 0.2 (stat)+/- 0.2 (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of theZ boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
电子版国际标准刊号	1434-6052
WOS关键词	HADRON COLLIDERS ; NNLO QCD ; Z DECAYS ; LHC ; ALGORITHMS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000429589900001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285817]
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 associated Z plus charm production in proton-proton collisions at root s=8TeV[J]. EUROPEAN PHYSICAL JOURNAL C,2018,78(4):287.
APA	CMS Collaboration.(2018).Measurement of associated Z plus charm production in proton-proton collisions at root s=8TeV.EUROPEAN PHYSICAL JOURNAL C,78(4),287.
MLA	CMS Collaboration."Measurement of associated Z plus charm production in proton-proton collisions at root s=8TeV".EUROPEAN PHYSICAL JOURNAL C 78.4(2018):287.