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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00466020" target="_blank" >RIV/68378271:_____/16:00466020 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.physletb.2016.02.055" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2016.02.055</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2016.02.055" target="_blank" >10.1016/j.physletb.2016.02.055</a>

Result language
angličtina
Original language name
Measurement of the charge asymmetry in highly boosted top-quark pair production in s = 8 TeV pp collision data collected by the ATLAS experiment
Original language description
In the pptt 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 4.23.2% , in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt mass bins is also presented.nn
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BF - Elementary particle theory and high energy physics
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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