Anomalous triple gauge boson couplings in ZZ production at the LHC and the role of Z boson polarizations

Rahaman, Rafiqul; Singh, Ritesh K.

doi:10.1016/j.nuclphysb.2019.114754

Cited by 34 publications

(19 citation statements)

References 77 publications

(110 reference statements)

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“…In the theoretical side, the phenomenology of TNGBCs at particle colliders was widely studied long ago [15,[21][22][23][24][25][26][27] and also has been of interest lately [28][29][30][31]. Even more, study of the potential effects of TNGBCs at future colliders has been the source of renewed interest very recently [32][33][34][35][36]. TNGBCs, which require one off-shell gauge boson at least to be non-vanishing due to Bose statistics, are induced through dimension-six and dimension-eight operators [13,20,37,38] and can be parametrized in a model independent way by two C P-even and two C P-odd form factors.…”

Section: Introductionmentioning

confidence: 99%

Contributions to $$ZZV^*$$ ($$V=\gamma ,Z,Z'$$) couplings from CP violating flavor changing couplings

2021

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The one-loop contributions to the trilinear neutral gauge boson couplings $$ZZV^*$$ Z Z V ∗ ($$V=\gamma ,Z,Z'$$ V = γ , Z , Z ′ ), parametrized in terms of one CP-conserving $$f_5^{V}$$ f 5 V and one CP-violating $$f_4^{V}$$ f 4 V form factors, are calculated in models with CP-violating flavor changing neutral current couplings mediated by the Z gauge boson and an extra neutral gauge boson $$Z'$$ Z ′ . Analytical results are presented in terms of Passarino-Veltman scalar functions. Constraints on the vector and axial couplings of the Z gauge boson $$\left| g_{{VZ}}^{tu}\right| < 0.0096$$ g VZ tu < 0.0096 and $$\left| g_{{VZ}}^{tc}\right| <0.011$$ g VZ tc < 0.011 are obtained from the current experimental data on the $$t\rightarrow Z q$$ t → Z q decays. It is found that in the case of the $$ZZ\gamma ^*$$ Z Z γ ∗ vertex the only non-vanishing form factor is $$f_5^{\gamma }$$ f 5 γ , which can be of the order of $$10^{-3}$$ 10 - 3 , whereas for the $$ZZZ^*$$ Z Z Z ∗ vertex both form factors $$f_5^{Z}$$ f 5 Z and $$f_4^{Z}$$ f 4 Z are non-vanishing and can be of the order of $$10^{-6}$$ 10 - 6 and $$10^{-5}$$ 10 - 5 , respectively. Our estimates for $$f_5^{\gamma }$$ f 5 γ and $$f_5^{Z}$$ f 5 Z are smaller than those predicted by the standard model, where $$f_4^{Z}$$ f 4 Z is absent up to the one loop level. We also estimate the $$ZZ{Z'}^{*}$$ Z Z Z ′ ∗ form factors arising from both diagonal and non-diagonal $$Z'$$ Z ′ couplings within a few extension models. It is found that in the diagonal case $$f_{5}^{Z'}$$ f 5 Z ′ is the only non-vanishing form factor and its real and imaginary parts can be of the order of $$10^{-1}$$ 10 - 1 –$$10^{-2}$$ 10 - 2 and $$ 10^{-2}$$ 10 - 2 –$$10^{-3}$$ 10 - 3 , respectively, with the dominant contributions arising from the light quarks and leptons. In the non-diagonal case $$f_{5}^{Z^\prime }$$ f 5 Z ′ can be of the order of $$10^{-4}$$ 10 - 4 , whereas $$f_4^{Z'}$$ f 4 Z ′ can reach values as large as $$10^{-7}$$ 10 - 7 –$$10^{-8}$$ 10 - 8 , with the largest contributions arising from the $$Z'tq$$ Z ′ t q couplings.

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Section: Introductionmentioning

confidence: 99%

Contributions to $$ZZV^*$$ ($$V=\gamma ,Z,Z'$$) couplings from CP violating flavor changing couplings

2021

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“…It is also known that considerable attention has been paid to the investigation of anomalous triple gauge boson couplings of the electroweak sector [6][7][8][9][10][11][12][13]. The interest in studying these couplings is mainly due to the possibility of providing a better understanding of the electroweak symmetry breaking mechanism and tests the predictions in collider experiments.…”

Section: Introductionmentioning

confidence: 99%

“…This can be achieved by adding higher dimension effective operators to the Lagrangian of the SM. For example, in this work, we will consider an interaction term of the form [6].…”

Section: Introductionmentioning

confidence: 99%

Remarks on an Anomalous Triple Gauge Boson Couplings

Gaete

Helayël-Neto

Ospedal

2021

Advances in High Energy Physics

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We address the effect of an anomalous triple gauge boson couplings on a physical observable for the electroweak sector of the Standard Model, when the S U 2 L ⊗ U 1 Y symmetry is spontaneously broken by the Higgs mechanism to U 1 e m . Our calculation is done within the framework of the gauge-invariant, but path-dependent variable formalism is an alternative to the Wilson loop approach. Our result shows that the interaction energy is the sum of a Yukawa and a linear potential, leading to the confinement of static probe charges. The point we wish to emphasize, however, is that the anomalous triple gauge boson couplings ( Z γ γ ) contributes to the confinement for distances on the intranuclear scale.

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“…The top quark polarizations and spin correlations have also been measured at the Tevatron [46][47][48][49][50][51][52] as well as at the large hadron collider ( LHC) [53][54][55][56][57][58][59][60][61][62][63]. Lately, polarization for Z and W bosons also got some attention in probing new physics [3,[64][65][66][67][68][69][70][71][72][73][74][75]. The polarizations of Z and W have also been measured recently at the LHC in ZW production process [76].…”

Section: Introductionmentioning

confidence: 99%

Breaking down the entire spectrum of spin correlations of a pair of particles involving fermions and gauge bosons

Rahaman¹,

Singh²

2021

Preprint

Self Cite

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We discuss a formalism for the spin correlations and polarizations in two particle systems with spins half-half, half-one and one-one, and provide the connections between the polarizations and correlations with the joint angular distributions of decay products identifying the asymmetries for them. We demonstrate the formalism in the processes e − e + → t t, gb → tW − and e − e + → ZZ in the standard model as examples. We investigate the effect of some anomalous couplings on the polarizations and spin correlations in the processes e − e + → t t, gb → tW − and u d → ZW + and compare their strengths. The spin correlations provide a significant improvement over the polarizations in probing the anomalous couplings.

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Anomalous triple gauge boson couplings in ZZ production at the LHC and the role of Z boson polarizations

Cited by 34 publications

References 77 publications

Contributions to $$ZZV^*$$ ($$V=\gamma ,Z,Z'$$) couplings from CP violating flavor changing couplings

Contributions to $$ZZV^*$$ ($$V=\gamma ,Z,Z'$$) couplings from CP violating flavor changing couplings

Remarks on an Anomalous Triple Gauge Boson Couplings

Breaking down the entire spectrum of spin correlations of a pair of particles involving fermions and gauge bosons

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