Measurement of neutral strange particle production in the underlying event in proton-proton collisions at root s=7 TeV

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 neutral strange particle production in the underlying event in proton-proton collisions at root s=7 TeV
	CMS Collaboration
刊名	PHYSICAL REVIEW D
	2013
卷号	88 期号:5
通讯作者	Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
英文摘要	Measurements are presented of the production of primary K-S(0) and Lambda particles in proton-proton collisions at root s = 7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K-S(0) and Lambda particles measured at pseudorapidities vertical bar eta vertical bar < 2 rise with increasing charged-particle jet p(T) in the range 1-10 GeV/c and saturate in the region 10-50 GeV/c. The rise and saturation of the strange-particle yields and transverse momentum sums in the underlying event are similar to those observed for inclusive charged particles, which confirms the impact-parameter picture of multiple parton interactions. The results are compared to recent tunes of the PYTHIA Monte Carlo event generator. The PYTHIA simulations underestimate the data by 15%-30% for K-S(0) mesons and by about 50% for Lambda baryons, a deficit similar to that observed for the inclusive strange-particle production in non-single-diffractive proton-proton collisions. The constant strange-to charged-particle activity ratios with respect to the leading jet p(T) and similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000323893400001
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213592]
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 neutral strange particle production in the underlying event in proton-proton collisions at root s=7 TeV[J]. PHYSICAL REVIEW D,2013,88(5).
APA	CMS Collaboration.(2013).Measurement of neutral strange particle production in the underlying event in proton-proton collisions at root s=7 TeV.PHYSICAL REVIEW D,88(5).
MLA	CMS Collaboration."Measurement of neutral strange particle production in the underlying event in proton-proton collisions at root s=7 TeV".PHYSICAL REVIEW D 88.5(2013).