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Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at root s=7 TeV using the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2874
2016 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 93, no 1, 012002Article in journal (Refereed) PublishedText
Abstract [en]

A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and (t) over bar quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb(-1) at a center-of-mass energy of root s = 7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles theta(1) and theta(2) between the charged leptons and the direction of motion of the parent quarks in the t (t) over bar rest frame are sensitive to the spin information, and the distribution of cos theta(1).cos theta(2) is sensitive to the spin correlation between the t and (t) over bar quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 1, 012002
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-182600DOI: 10.1103/PhysRevD.93.012002ISI: 000368324500002ScopusID: 2-s2.0-84956625743OAI: oai:DiVA.org:kth-182600DiVA: diva2:904986
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20160220

Available from: 2016-02-20 Created: 2016-02-20 Last updated: 2016-04-07Bibliographically approved

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Lund-Jensen, BengtSidebo, Per EdvinStrandberg, Jonas
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