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## Evidence for spin correlation in ttbar production

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Evidence for spin correlation in ttbar production. / D0 Collaboration, The; Bertram, Iain; Borissov, Guennadi; Fox, Harald; Ross, Anthony; Williams, Mark; Ratoff, Peter.

In: Physical review letters, Vol. 108, No. 3, 032004, 19.01.2012.

Research output: Contribution to journalJournal article

### Author

D0 Collaboration, The ; Bertram, Iain ; Borissov, Guennadi ; Fox, Harald ; Ross, Anthony ; Williams, Mark ; Ratoff, Peter. / Evidence for spin correlation in ttbar production. In: Physical review letters. 2012 ; Vol. 108, No. 3.

### Bibtex

@article{522368407a824e8590edc03668009028,
title = "Evidence for spin correlation in ttbar production",
abstract = "We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.",
author = "{D0 Collaboration}, The and Iain Bertram and Guennadi Borissov and Harald Fox and Anthony Ross and Mark Williams and Peter Ratoff",
note = "{\textcopyright} 2012 American Physical Society 7 pages, 2 figures",
year = "2012",
month = jan,
day = "19",
doi = "10.1103/PhysRevLett.108.032004",
language = "English",
volume = "108",
journal = "Physical review letters",
issn = "1079-7114",
publisher = "American Physical Society",
number = "3",

}

### RIS

TY - JOUR

T1 - Evidence for spin correlation in ttbar production

AU - D0 Collaboration, The

AU - Bertram, Iain

AU - Fox, Harald

AU - Ross, Anthony

AU - Williams, Mark

AU - Ratoff, Peter

N1 - © 2012 American Physical Society 7 pages, 2 figures

PY - 2012/1/19

Y1 - 2012/1/19

N2 - We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.

AB - We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy $\sqrt{s}=1.96$ TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.

U2 - 10.1103/PhysRevLett.108.032004

DO - 10.1103/PhysRevLett.108.032004

M3 - Journal article

VL - 108

JO - Physical review letters

JF - Physical review letters

SN - 1079-7114

IS - 3

M1 - 032004

ER -