1 Ocak 2016 Dergi makalesi Açık Erişim

CERN İşbirliği

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    <subfield code="a">&lt;p&gt;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¯&amp;gt;0.75 TeV ) and an absolute rapidity difference of the top and anti-top quark candidates within −2&amp;lt;|yt|−|yt¯|&amp;lt;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.&lt;/p&gt;</subfield>
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    <subfield code="a">CERN İşbirliği</subfield>
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    <subfield code="a">10.1016/j.physletb.2016.02.055</subfield>
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    <subfield code="a">Measurement of the charge asymmetry in highly boosted top-quark pair production in s=8Â TeV pp collision data collected by the ATLAS experiment</subfield>
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    <subfield code="p">Physics Letters B</subfield>
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