Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

Collaboration, ATLAS

doi:10.1007/jhep05(2015)061

Cited by 23 publications

(19 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical predictions for this observable are of order 1% in the SM [10,11], but its sensitivity to new physics makes measurements of the effect interesting even when the precision is not high enough to establish the existence of the SM charge asymmetry. Both the CMS and ATLAS collaborations have published results based on the data collected at a centreof-mass energy √ s = 7 TeV, which are in agreement with the SM predictions [12][13][14][15].…”

Section: Introductionsupporting

confidence: 63%

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite

Inclusive and differential measurements of the tt charge asymmetry in pp collisions at √ s = 8 TeVThe CMS Collaboration * AbstractThe tt charge asymmetry is measured in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb −1 . Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010 ± 0.0068 (stat) ± 0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of −0.0035 ± 0.0072 (stat) ± 0.0031 (syst). All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.

show abstract

Section: Introductionsupporting

confidence: 63%

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite

show abstract

“…The NLO prediction for A C is about 1% making this measurement difficult. Current preliminary measurements by ATLAS [66,67] and CMS [68,69,70] are all consistent with A C = 0 with uncertainties of 1 − 2%.…”

Section: Fb −1 Of Datamentioning

confidence: 73%

The top quark (20 years after its discovery)

et al. 2015

View full text Add to dashboard Cite

This paper, written to mark the twentieth anniversary of the discovery of the top quark, offers some insight into how the understanding of this heaviest known particle has developed from prediction through search to discovery to the current knowledge of its production mechanisms and properties. The central role of the top quark in the Standard Model is considered, and the window of opportunity it opens for seeking new physics beyond the Standard Model is discussed. Contents 8.1 Standard Model self-consistency: chiral anomalies; 8.2 Flavor changing neutral currents and the GIM mechanism; 8.3 Top-quark Yukawa coupling and consistency of the Standard Model at high energy scales; 8.4 Quantum corrections to electroweak observables 9. Top quark as a window to new physics 1151 9.1 Searches for associated t " t production; 9.2 Searches for non-Standard Model Higgs bosons; 9.3 Searches for supersymmetric partners of the top quark; 9.4 Searches for vector-like quarks; 9.5 Searches for new gauge bosons 10. Conclusions 1154 References 1155

show abstract

“…The ATLAS collaboration has measured the tt charge asymmetry by reconstructing the tt system in dilepton tt events and also by directly using the charged leptons in such events [2]. The tt charge asymmetry is defined as…”

Section: Tt Charge Asymmetrymentioning

confidence: 99%

“…Comparisons of the SM prediction to data for the (a) ∆|y| and (b) ∆|η| distributions. Taken from[2].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Top properties measurements with the ATLAS detector

Neep

2016

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2015)

View full text Add to dashboard Cite

The top quark is unique among the known quarks in that it decays before it has an opportunity to form hadronic bound states. This makes measurements of its properties particularly interesting as one can access directly the properties of a bare quark. Measurements of the charge asymmetry in tt pair events are presented. The measurements use the 7 TeV ATLAS datasets and probe models of physics beyond the Standard Model. A measurement of the correlation between the direction of the spins of tt pairs is also presented. The measurement agrees with the Standard Model and is used to set limits on the production of the supersymmetric partner of the top quark. In addition, a novel measurement of colour flow in tt pair events is presented. The measurement uses the jets originating from the W boson and demonstrates the ability of the colour flow observable to distinguish between colour octet and colour singlet final states.

show abstract

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

Cited by 23 publications

References 52 publications

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite

The top quark (20 years after its discovery)

Top properties measurements with the ATLAS detector

Contact Info

Product

Resources

About

Measurement of the charge asymmetry in dileptonic decays of top quark pairs in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV using the ATLAS detector

Cited by 23 publications

References 52 publications

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at sKhachatryan1, Sirunyan2, Tumasyan3 et al. 2016Physics Letters BSelf Cite406210View full textAdd to dashboardCite

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at sKhachatryan1, Sirunyan2, Tumasyan3 et al. 2016Physics Letters BSelf Cite406210View full textAdd to dashboardCite

The top quark (20 years after its discovery)

Top properties measurements with the ATLAS detector

Contact Info

Product

Resources

About

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite

Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at s
Khachatryan¹,
Sirunyan²,
Tumasyan³
et al. 2016
Physics Letters B
Self Cite
40
6
21
0
View full text Add to dashboard Cite