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https://hdl.handle.net/10316/108769
Title: | Measurement of the charge asymmetry in highly boosted top-quark pair production in √s=8 TeV pp collision data collected by the ATLAS experiment | Authors: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Issue Date: | 2016 | Publisher: | Elsevier | Serial title, monograph or event: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Volume: | 756 | Abstract: | In the pp →t¯tprocess 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 20.3fb−1of ppcollision data at √s=8 TeVcollected 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 (mt¯t>0.75TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2 <|yt| −|y¯t| <2is measured to be 4.2 ±3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three t¯tmass bins is also presented. | URI: | https://hdl.handle.net/10316/108769 | DOI: | 10.1016/j.physletb.2016.02.055 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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Measurement of the charge asymmetry in highly boosted top-quark pair production in √s=8 TeV pp collision data collected by the ATLAS experiment.pdf | 1.95 MB | Adobe PDF | View/Open |
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