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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

Aad, G.
•
Abbott, B.
•
Abdallah, J.
altro
Zwalinski, L.
2015
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
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
DOI
10.1103/PhysRevLett.114.142001
WOS
WOS:000352350000006
Archivio
http://hdl.handle.net/11390/1096568
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84979725823
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979725823&partnerID=40&md5=225dd93798994f598af8aaef16698ba4
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  • Physics and Astronomy...

Scopus© citazioni
87
Data di acquisizione
Jun 15, 2022
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Web of Science© citazioni
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Data di acquisizione
Mar 24, 2024
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Data di acquisizione
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