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.

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

CONTA, CLAUDIO;DONDERO, PAOLO;FRATERNALI, MARCO;INTROZZI, GIANLUCA;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2016-01-01

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.
2016
The Physics category includes resources of a broad, general nature that contain materials from all areas of physics, The category also includes resources specifically concerned with the following physics sub-fields: mathematical physics, particle and nuclear physics, physics of fluids and plasmas, quantum physics, and theoretical physics.
Esperti anonimi
Inglese
Internazionale
STAMPA
756
52
71
20
Nuclear and High Energy Physics, HADRON COLLIDERS; JET SUBSTRUCTURE; RESUMMATION; LHC
http://www.sciencedirect.com/science/journal/03702693
2853
info:eu-repo/semantics/article
262
Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Aben, R.; Abolins, M.; Abouzeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1122702
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