Probing 
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 couplings using 
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 boson polarization in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>Z</mml:mi></mml:math>
 production at hadron

Cao, Qing-Hong; Yan, Bin; Yuan, C.–P.; Zhang, Ya

doi:10.1103/physrevd.102.055010

Cited by 15 publications

(7 citation statements)

References 55 publications

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“…The polarization properties and resulting angular distributions have been used to distinguish signals from backgrounds [31,44]. For O T i operators, we find that the Z bosons are dominantly transversely polarized from the partial wave expansions 1 .…”

Section: Features Of the Signalmentioning

confidence: 96%

Constraints on anomalous quartic gauge couplings via $Zγjj$ production at the LHC

Yang,

Guo,

Yue

et al. 2021

Preprint

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In this paper, we investigate the contributions of anomalous quartic gauge couplings (aQGCs) to Zγjj production at the Large Hadron Collider (LHC) in the context of Standard Model effective theory (SMEFT). When energy scale is large, the validity of SMEFT becomes an important issue.To ensure the validity, the unitarity bound is applied in a model independent approach, which is found to have significant suppressive effects on the signals of O M i operators. The kinematic and polarization features of the aQGC signals are also studied. The polarization effect is useful to highlight the signals of O T i operators. The sensitivity estimates on dimension-8 operators with unitarity bounds at √ s = 14 TeV are obtained.

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Section: Features Of the Signalmentioning

confidence: 96%

Constraints on anomalous quartic gauge couplings via $Zγjj$ production at the LHC

Yang,

Guo,

Yue

et al. 2021

Preprint

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“…The basis of our analysis is also formed by extrapolating existing searches to 3=ab and eventually to 100 TeV. In particular, when statistics is not a limiting factor, a more fine-grained picture can be obtained by exploiting differential information in more detail (see also a recent proposal to employ polarization information in nontop channels [95]). The latter, however, needs to be considered again in the context of experimental and theoretical limitations.…”

Section: Fig 2 Left: Maximum Excluded Top Partner Mass M T Versus Rmentioning

confidence: 99%

Electroweak top couplings, partial compositeness, and top partner searches

et al. 2020

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Partial top quark compositeness is a crucial aspect of theories with strong electroweak symmetry breaking. Together with the heavy top partners that lift the top quark mass to its observed value, these theories predict correlated modifications of the top quark's electroweak couplings. Associated measurements therefore provide direct constraints on the ultraviolet structure of the underlying hypercolor dynamics. In this paper, we employ a minimal version of top compositeness to discuss how measurements related to the top's electroweak gauge interactions can inform the potential composite nature of the TeV scale. In doing so, we identify the dominant factors that limit the beyond the Standard Model sensitivity. Extrapolating to a future 100 TeV hadron collider, we demonstrate that top quark measurements performed at highest precision can provide additional information to resonance search by performing a representative resonant top partner search that specifically targets the correlated resonant electroweak top partner signatures.

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“…It is expected that, due to the Goldstone boson equivalence theorem [28,29], top-quark corrections at two-loops could be significant as well, especially for longitudinally polarised Z bosons at high invariant mass. This configuration is of particular interest, since it provides unique opportunities for measurement of an anomalous ttZ coupling [30,31]. Contributions from top-quark at twoloops were calculated in [32,33] using the large top-mass approximation and subsequently improved using Padé approximants in [34].…”

Section: Introductionmentioning

confidence: 99%

Two-loop helicity amplitudes for gg → ZZ with full top-quark mass effects

Agarwal

Jones

Manteuffel

2021

J. High Energ. Phys.

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We calculate the two-loop QCD corrections to gg → ZZ involving a closed top-quark loop. We present a new method to systematically construct linear combinations of Feynman integrals with a convergent parametric representation, where we also allow for irreducible numerators, higher powers of propagators, dimensionally shifted integrals, and subsector integrals. The amplitude is expressed in terms of such finite integrals by employing syzygies derived with linear algebra and finite field techniques. Evaluating the amplitude using numerical integration, we find agreement with previous expansions in asymptotic limits and provide ab initio results also for intermediate partonic energies and non-central scattering at higher energies.

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Probing Ztt¯ couplings using Z boson polarization in ZZ production at hadron

Cited by 15 publications

References 55 publications

Constraints on anomalous quartic gauge couplings via $Zγjj$ production at the LHC

Constraints on anomalous quartic gauge couplings via $Zγjj$ production at the LHC

Electroweak top couplings, partial compositeness, and top partner searches

Two-loop helicity amplitudes for gg → ZZ with full top-quark mass effects

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