Measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at √s=8 TeV using the ATLAS detector

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PhysRevLett.114.142001
Rights statement: © 2015 CERN, for the ATLAS Collaboration
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https://doi.org/10.1103/PhysRevLett.114.142001
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Measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at √s=8 TeV using the ATLAS detector. / The ATLAS collaboration.
In: Physical review letters, Vol. 114, No. 14, 142001, 08.04.2015.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{513eb4d1ebcb41e3beae40551d06ac46,

title = "Measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at √s=8 TeV using the ATLAS detector",

abstract = "A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.",

author = "Lee Allison and Adam Barton and Michael Beattie and Guennadi Borissov and Eva Bouhova-Thacker and Alexandre Chilingarov and William Dearnaley and Harald Fox and Kathryn Grimm and Robert Henderson and Gareth Hughes and Jones, {Roger William Lewis} and Vakhtang Kartvelishvili and Robin Long and Peter Love and Harvey Maddocks and Maria Smizanska and James Walder and {The ATLAS collaboration}",

note = "{\textcopyright} 2015 CERN, for the ATLAS Collaboration",

year = "2015",

month = apr,

day = "8",

doi = "10.1103/PhysRevLett.114.142001",

language = "English",

volume = "114",

journal = "Physical review letters",

issn = "1079-7114",

publisher = "American Physical Society",

number = "14",

}

RIS

TY - JOUR

T1 - Measurement of spin correlation in top-antitop quark events and search for top squark pair production in pp collisions at √s=8 TeV using the ATLAS detector

AU - Allison, Lee

AU - Barton, Adam

AU - Beattie, Michael

AU - Borissov, Guennadi

AU - Bouhova-Thacker, Eva

AU - Chilingarov, Alexandre

AU - Dearnaley, William

AU - Fox, Harald

AU - Grimm, Kathryn

AU - Henderson, Robert

AU - Hughes, Gareth

AU - Jones, Roger William Lewis

AU - Kartvelishvili, Vakhtang

AU - Long, Robin

AU - Love, Peter

AU - Maddocks, Harvey

AU - Smizanska, Maria

AU - Walder, James

AU - The ATLAS collaboration

PY - 2015/4/8

Y1 - 2015/4/8

N2 - A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

AB - A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

U2 - 10.1103/PhysRevLett.114.142001

DO - 10.1103/PhysRevLett.114.142001

M3 - Journal article

VL - 114

JO - Physical review letters

JF - Physical review letters

SN - 1079-7114

IS - 14

M1 - 142001

ER -

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