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Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector
ATLAS collaboration
2012
发表期刊PHYSICAL REVIEW LETTERS
卷号108期号:21
通讯作者Aad, G (reprint author), Univ Freiburg, Fak Math & Phys, Hugstetter Str 55, D-79106 Freiburg, Germany.
摘要A measurement of spin correlation in t (t) over bar production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb(-1). Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to A(helicity) = 0.40(-0.08)(+0.09), in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
关键词QUARK PAIR PRODUCTION TOP-QUARK HADRON COLLIDERS DECAY LHC DISTRIBUTIONS POLARIZATION TEVATRON
学科领域Physics
DOI10.1103/PhysRevLett.108.212001
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000304405000003
引用统计
被引频次:126[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213247
专题实验物理中心
作者单位中国科学院高能物理研究所
推荐引用方式
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ATLAS collaboration. Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector[J]. PHYSICAL REVIEW LETTERS,2012,108(21).
APA ATLAS collaboration.(2012).Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector.PHYSICAL REVIEW LETTERS,108(21).
MLA ATLAS collaboration."Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at root s=7 TeV Using the ATLAS Detector".PHYSICAL REVIEW LETTERS 108.21(2012).
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