Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment - INSPIRE

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Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment

ATLAS

Collaboration

Dec 18, 2015

20 pages

Published in:

Phys.Lett.B 756 (2016) 52-71

Published: May 10, 2016

e-Print:

1512.06092 [hep-ex]

DOI:

10.1016/j.physletb.2016.02.055

PDG:

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

Charge Asymmetry (A

_{C}

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

\sqrt {s }

Report number:

CERN-PH-EP-2015-303

Experiments:

CERN-LHC-ATLAS

View in:

reference search53 citations

Citations per year

Abstract: (Elsevier)

In the pp→tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb −1 of pp collision data at s=8TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair ( mtt¯>0.75 TeV ) and an absolute rapidity difference of the top and anti-top quark candidates within −2<|yt|−|yt¯|<2 is measured to be 4.2±3.2% , in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented.

Note:

19 pages, plus author list - 36 pages total, 3 figures, 2 tables. Published in Physics Letters B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-10/

p p: scattering
p p: colliding beams
top: pair production
charge: asymmetry: measured
top: mass
top: angular distribution
top: boosted particle
mass spectrum: (2top)
rapidity: difference
mass dependence

References(83)

Figures(5)

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