Publisher’s Note: Forward-backward asymmetry of the top quark in diquark models [Phys. Rev. D<b>82</b>, 034034 (2010)]

Arhrib, Abdesslam; Benbrik, Rachid; Chen, Chuan Hung

doi:10.1103/physrevd.82.059902

Cited by 35 publications

(55 citation statements)

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“…The scalar triplet ω 4 contributes to uū → tt, with negative interference with the SM [24,27]. Once again, it requires large couplings and a cancellation to explain the measured asymmetries.…”

Section: Asymmetries At Tevatronmentioning

confidence: 93%

“…In this sense, these models can be considered minimal or, as we will refer to in the following, 'simple'. The simple models which have received most attention are: (i) a new colour-octet produced in the s channel [7][8][9][10][11][12][13][14][15]; (ii) a flavour-violating Z ′ [16][17][18][19] or W ′ boson [20][21][22] exchanged in the t channel; (iii) a charge 4/3 scalar exchanged in the u channel [23][24][25][26][27][28]. Some comparative studies between them have been performed, too [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Simple models for the top asymmetry: constraints and predictions

Aguilar-Saavedra

Pérez-Victoria

2011

J. High Energ. Phys.

106

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We perform a comprehensive study of the allowed range for the Tevatron tt forward-backward asymmetries in six representative new physics models: a flavour-changing Z ′ boson, a scalar isodoublet, a W ′ boson, a heavy axigluon, a colour-triplet and a colour-sextet scalar. We devote special attention to the constraints from the tt tail at LHC on the parameter space, which will be dramatic if the measurements agree with the Standard Model prediction, specially for Z ′ and W ′ bosons. We also study the predictions for the charge asymmetries at LHC and compare several proposed definitions.

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Section: Asymmetries At Tevatronmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Simple models for the top asymmetry: constraints and predictions

Aguilar-Saavedra

Pérez-Victoria

2011

J. High Energ. Phys.

106

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“…Meanwhile, a variety of models have been proposed to explain it. Most of these produce the asymmetry through the exchange of a new particle, either an s-channel mediator with axial couplings to both top and light quarks , or a t-channel (or u-channel) mediator [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] with flavor-violating couplings that convert a light quark or antiquark to a top quark. Both processes are illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries

2012

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Flavor-violating interactions involving new heavy particles are among proposed explanations for the tt forward-backward asymmetry observed at the Tevatron. Many of these models generate a tt-plus-jet signal at the LHC. In this paper we identify several new charge asymmetric variables in ttj events that can contribute to the discovery of such models at the LHC. We propose a data-driven method for the background, largely eliminating the need for a Monte Carlo prediction of tt-plus-jets, and thus reducing systematic errors. With a fast detector simulation, we estimate the statistical sensitivity of our variables for one of these models, finding that charge-asymmetric variables could materially assist in the exclusion of the Standard Model across much of the mass and coupling range, given 5 inverse fb of data. Should any signal appear, our variables will be useful in distinguishing classes of models from one another.

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“…Similarly, model-independent analyses were performed [24,25,26] and new physics models were invoked [27,28,29,30,31,32,33,34,35,36,37,38,39,40,41] to explain earlier D0 and CDF measurements of the inclusive asymmetry [5,6].…”

Section: Introductionmentioning

confidence: 99%

Implications of the CDF $ t\bar{t} $ forward-backward asymmetry for hard top physics

Delaunay

Gedalia

Hochberg

et al. 2011

J. High Energ. Phys.

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The CDF collaboration has recently reported a large deviation from the standard model of the tt forward-backward asymmetry in the high invariant mass region. We interpret this measurement as coming from new physics at a heavy scale Λ , and perform a model-independent analysis up to O(1/Λ 4 ) . A simple formalism to test and constrain models of new physics is provided. We find that a large asymmetry cannot be accommodated by heavy new physics that does not interfere with the standard model. We show that a smoking gun test for the heavy new physics hypothesis is a significant deviation from the standard model prediction for the tt differential cross section at large invariant mass. At M tt > 1 TeV the cross section is predicted to be at least twice that of the SM at the Tevatron, and for M tt > 1.5 TeV at least three times larger than the SM at the LHC.

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Publisher’s Note: Forward-backward asymmetry of the top quark in diquark models [Phys. Rev. D82, 034034 (2010)]

Abstract: Publisher's Note: Forward-backward asymmetry of the top quark in diquark models [Phys. Rev. D 82, 034034 (2010)]

Cited by 35 publications

References 0 publications

Simple models for the top asymmetry: constraints and predictions

Simple models for the top asymmetry: constraints and predictions

Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries

Implications of the CDF $ t\bar{t} $ forward-backward asymmetry for hard top physics

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