Revisiting the bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$ in electron–positron collisions

Wang, Sheng-Quan; Meng, Rui-Qing; Wu, Xing-Gang; Chen, Long; Shen, Jian-Ming

doi:10.1140/epjc/s10052-020-8234-x

Cited by 7 publications

(7 citation statements)

References 38 publications

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“…Our data-set includes all traditional precision electroweak data, including the recent improved computation of the bottom forward/backward asymmetry [5], and measurements of the Higgs Dimension-less form factors…”

Section: Summary Of Datamentioning

confidence: 99%

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Interpreting electroweak precision data including the $W$-mass CDF anomaly

Струмиа¹

2022

Preprint

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We perform a global fit of electroweak data, finding that the anomaly in the W mass claimed by the CDF collaboration can be reproduced as a universal newphysics correction to the T parameter or |H † D µ H| 2 operator. Contributions at tree-level from multi-TeV new physics can fit the anomaly compatibly with collider bounds: we explore which scalar vacuum expectation values (such as a triplet with zero hypercharge), Z vectors (such as a Z coupled to the Higgs only), little-Higgs models or higher-dimensional geometries provide good global fits. On the other hand, new physics that contributes at loop-level must be around the weak scale to fit the anomaly. Thereby it generically conflicts with collider bounds, that can be bypassed assuming special kinematics like quasi-degenerate particles that decay into Dark Matter (such as an inert Higgs doublet or appropriate supersymmetric particles).

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Section: Summary Of Datamentioning

confidence: 99%

“…The 'littlest' Higgs model [31,32] assumes a SU (5) global symmetry broken to SO(5) at some scale f . The SU(2) 1 ⊗ SU(2) 2 ⊗U(1) 1 ⊗U(1) 2 subgroup of SU( 5) is gauged, with gauge couplings g 1 , g 2 , g 1 , g 2 respectively.…”

Section: The Su(5)/so(5) 'Littlest' Higgs Modelsmentioning

confidence: 99%

Interpreting electroweak precision data including the $W$-mass CDF anomaly

Струмиа¹

2022

Preprint

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“…Following the PMC procedure we determined the PMC scale to be µ PMC r = 9.7 GeV for the b quark forward-backward asymmetry with the thrust axis definition in ref. [47]. After applying PMC scale setting, the QCD correction factor with the thrust axis definition is…”

Section: Phenomenological Consequencesmentioning

confidence: 99%

“…[46] 1.004 ref. [47] 0.1038 ref. [ 5: Deviations between different central values of the SM fit A b,fit F B and the A 0,b F B determined in literature experimental uncertainty, currently dominated by the statistical uncertainties, is expected to be greatly reduced at future lepton colliders [12][13][14][15][16].…”

Section: Phenomenological Consequencesmentioning

confidence: 99%

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Forward-backward asymmetries of the heavy quark pair production in $e^+e^-$ collisions at $\mathcal{O}(α_s^2)$

Chen¹

2021

Preprint

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The talk is on a computational set-up for calculating the production of a massive quark-antiquark pair in electron positron collisions to order α 2 s in the coupling of quantum chromodynamics (QCD) at the differential level using the antenna subtraction method. Theoretical predictions on the production of top quark pairs in the continuum, and the bottom quark pairs at the Z resonance, will be discussed. In particular, we would be focusing on the order α 2 s QCD corrections to the heavy quark forward-backward asymmetry (AFB) in electron positron collisions. In the case of the AFB of bottom quarks at the Z resonance, the QCD corrections are determined with respect to both the bottom quark axis and the thrust axis. We will also briefly discuss improvements on these QCD corrections brought by applying the optimization procedure based on the Principle of Maximum Conformality.

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Top and bottom quark forward-backward asymmetries at next-to-next-to-leading order QCD in (un)polarized electron positron collisions

Bernreuther

Chen

Lü

et al. 2023

J. High Energ. Phys.

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We consider, at order $$ {\alpha}_s^2 $$ α s 2 in the QCD coupling, top-quark pair production in the continuum at various center-of-mass energies and b-quark pair production at the Z resonance by (un)polarized electron and positron beams. For top quarks we compute the forward-backward asymmetry with respect to the top-quark direction of flight, the associated polar angle distribution, and we analyze the effect of beam polarization on the QCD corrections to the leading-order asymmetry. We calculate also the polarized forward-backward asymmetry. For b-quark production at the Z peak we explore different definitions of AFB. In particular, we analyze b jets defined by the Durham and the flavor-kT clustering algorithms. We compute the inclusive b-jet and two-jet asymmetry with respect to the b-jet direction. For the latter asymmetry the QCD corrections to order $$ {\alpha}_s^2 $$ α s 2 are small. That predestines it to act as a precision observable.

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Revisiting the bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$ in electron–positron collisions

Cited by 7 publications

References 38 publications

Interpreting electroweak precision data including the $W$-mass CDF anomaly

Interpreting electroweak precision data including the $W$-mass CDF anomaly

Forward-backward asymmetries of the heavy quark pair production in $e^+e^-$ collisions at $\mathcal{O}(α_s^2)$

Top and bottom quark forward-backward asymmetries at next-to-next-to-leading order QCD in (un)polarized electron positron collisions

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