Collider-independent top quark forward-backward asymmetries: standard model predictions

Aguilar-Saavedra, J. A.; Bernreuther, W.; Si, Z. -G.

doi:10.48550/arxiv.1209.6352

Cited by 4 publications

(5 citation statements)

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“…In the present letter, we present differential asymmetries with the unexpanded definition (2) and without EW corrections (see figs. 2,3,4). The inclusive asymmetry, see fig.…”

Section: Resultsmentioning

confidence: 99%

“…The Tevatron collider is uniquely positioned for the measurement of this asymmetry since A FB is not present at pp colliders, e.g. the LHC (although a related, albeit strongly diluted asymmetry can be measured at the LHC; see for example [3] for more details). This unique Tevatron capability, coupled with the persistent discrepancy [4] between the measured and predicted A FB , have turned this observable into one of the most influential measurements performed at the Tevatron.…”

Section: Introductionmentioning

confidence: 99%

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Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation

2015

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We determine the dominant missing standard model (SM) contribution to the top quark pair forward-backward asymmetry at the Tevatron. Contrary to past expectations, we find a large, around 27%, shift relative to the well-known value of the inclusive asymmetry in next-to-leading order QCD. Combining all known standard model corrections, we find that A(FB)(SM)=0.095±0.007. This value is in agreement with the latest DØ measurement [V. M. Abazov et al. (D0 Collaboration), Phys. Rev. D 90, 072011 (2014)] A(FB)(D∅)=0.106±0.03 and about 1.5σ below that of CDF [T. Aaltonen et al. (CDF Collaboration), Phys. Rev. D 87, 092002 (2013)] A(FB)(CDF)=0.164±0.047. Our result is derived from a fully differential calculation of the next-to-next-to leading order (NNLO) QCD corrections to inclusive top pair production at hadron colliders and includes-without any approximation-all partonic channels contributing to this process. This is the first complete fully differential calculation in NNLO QCD of a two-to-two scattering process with all colored partons.

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“…In the present letter, we present differential asymmetries with the unexpanded definition (2) and without EW corrections (see figs. 2,3,4). The inclusive asymmetry, see fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation

2015

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“…A previous attempt to solve this puzzle has been the introduction of the colliderindependent asymmetries [12,44] A u , A d that are the same at the Tevatron and the LHC, and whose measurement -quite demanding from the experimental point of view-could settle the issue. Also, the determination of ratios of differential asymmetries [45,46] would be useful to uncover possible anomalies.…”

Section: Discussionmentioning

confidence: 99%

Shedding light on the $ t\overline{t} $ asymmetry: the photon handle

Aguilar-Saavedra

Álvarez

Rozas

et al. 2014

J. High Energ. Phys.

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We investigate a charge asymmetry in ttγ production at the LHC that provides complementary information to the measured asymmetries in tt production. We estimate the experimental uncertainty in its measurement at the LHC with 8 and 14 TeV. For new physics models that simultaneously reproduce the asymmetry excess in tt at the Tevatron and the SM-like asymmetry at the LHC, the measurement in ttγ at the LHC could exhibit significant deviations with respect to the SM prediction.

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“…Therefore, polarization studies may supply information about different SUSY scenarios [48]. On the other hand, explanations of the top-quark forward-backward asymmetry A FB observed at the Tevatron [38,39,[49][50][51], which exceeds the SM predictions [30-34, 36, 37, 52], must take into account the measurements of the t t charge asymmetry A C at the LHC [53-55] which are consistent with the SM expectations and tightly correlated with A FB [56][57][58][59][60][61][62][63][64], given that both t t observables could receive contributions from top-squark pair production decaying into neutralinos and top-quarks. However, it is possible to have an excess in A FB and no excess in A C if some cancellation occurs [60,[65][66][67][68] or even exhibit differences in t tγ production [69,70].…”

Section: Introductionmentioning

confidence: 98%

Top-quark polarization and asymmetries at the LHC in the effective description of squark interactions

2015

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A detailed study of top-quark polarizations and tt charge asymmetries, induced by topsquark-pair production at the LHC and the subsequent decayst → tχ 0 1 , is performed within the effective description of squark interactions, which includes the effective Yukawa couplings and another logarithmic term encoding the supersymmetry breaking. This effective approach is more suitable for its introduction into Monte-Carlo simulations and we make use of its implementation in MadGraph in order to investigate the possibilities of the charge asymmetry A C , measured at the LHC and consistent with SM expectations, to discriminate among different SUSY scenarios and analyze the implications of these scenarios in the top polarizations and related observables. * arian@unizar.es † ernesto.arganda@unizar.es ‡ siannah@unizar.es

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Collider-independent top quark forward-backward asymmetries: standard model predictions

Cited by 4 publications

References 0 publications

Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation

Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation

Shedding light on the $ t\overline{t} $ asymmetry: the photon handle

Top-quark polarization and asymmetries at the LHC in the effective description of squark interactions

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