Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $\sqrt{s}=8$ TeV Using the ATLAS Detector - INSPIRE

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Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $\sqrt{s}=8$ TeV Using the ATLAS Detector

ATLAS

Collaboration

Dec 15, 2014

19 pages

Published in:

Phys.Rev.Lett. 114 (2015) 14, 142001

Published: Apr 8, 2015

e-Print:

1412.4742 [hep-ex]

DOI:

10.1103/PhysRevLett.114.142001

PDG: Spin Correlation in

{{\mathit t}}{{\overline{\mathit t}}}

{{\mathit p}}{{\mathit p}}

Report number:

CERN-PH-EP-2014-257

Experiments:

CERN-LHC-ATLAS

View in:

reference search170 citations

Citations per year

Abstract: (APS)

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.

Note:

7 pages plus author list + cover pages (20 pages total), 2 figures, 2 tables, submitted to PRL, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-07/

14.65.Ha
12.38.Qk
13.85.Qk
14.80.Ly
p p: colliding beams
top: pair production
top: mass
spin: correlation
top: right-handed
squark: pair production

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