Spin polarization and alignment of the single Z boson from ee annihilation

Ots, I.; Uibo, Helen; Liivat, H.; Loide, R.-K.; Saar, R.

doi:10.1016/s0550-3213(00)00488-0

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…Figure 2: (a) t-channel and (b) u-channel SM tree level diagram for e + e − → Zγ, ZZ ZH, Zγ with vanishing electron mass have been calculated by us earlier [3,7]. At the threshold energies the spin orientation parameters reduce to the same expressions,…”

Section: The Z Boson Spin Polarization Vectors and Alignment Tensors ...mentioning

confidence: 97%

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Symmetries and similarities for spin orientation parameters in at SM thresholds

2011

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We consider the spin orientation of the final Z bosons for the processes in the Standard Model. We demonstrate that at the threshold energies of these processes the analytical expressions for the Z boson polarization vectors and alignment tensors coincide (e + e − → ZH, Zγ) or are very similar (e + e − → ZZ). In addition, we present interesting symmetry properties for the spin orientation parameters.

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Section: The Z Boson Spin Polarization Vectors and Alignment Tensors ...mentioning

confidence: 97%

“…4 of Ref. [3], giving the correlation between the spin orientation parameters and the angular distribution.…”

Section: Spin Orientation Of Final Particlesmentioning

confidence: 99%

Symmetries and similarities for spin orientation parameters in at SM thresholds

2011

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“…The individual values of these triple gauge boson couplings (TGCs) as described before are zero at tree level in the SM, with non-zero values arising at higher orders or in composite models. These anomalous couplings have been extensively studied in the literature in the context of different colliders 1 [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Moreover there has been a lot of work in the literature [8,10,13,17,23] where effective Lagrangians or effective momentum-space vertices and the associated form factors in neutral gauge boson production have been discussed.…”

Section: Jhep08(2014)124mentioning

confidence: 99%

New physics in e + e − → Zγ at the ILC with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings

Ananthanarayan

Lahiri

Patra

et al. 2014

J. High Energ. Phys.

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One of the most-studied signals for physics beyond the standard model in the production of gauge bosons in electron-positron collisions is due to the anomalous triple gauge boson couplings in the Zγ final state. In this work, we study the implications of this at the ILC with polarized beams for signals that go beyond traditional anomalous triple neutral gauge boson couplings. Here we report a dimension-8 CP-conserving ZγZ vertex that has not found mention in the literature. We carry out a systematic study of the anomalous couplings in general terms and arrive at a classification. We then obtain linear-order distributions with and without CP violation. Furthermore, we place the study in the context of general BSM interactions represented by e + e − Zγ contact interactions. We set up a correspondence between the triple gauge boson couplings and the four-point contact interactions. We also present sensitivities on these anomalous couplings, which will be achievable at the ILC with realistic polarization and luminosity.

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“…When calculating the process with both LP and TP nonvanishing components, the limit m/E → 0 can be conveniently taken by making use the approximation [11]…”

Section: Description Of the Spin Statesmentioning

confidence: 99%

“…On the other hand, both the scalar particle and unparticle contributions contain CP-odd (weak phase) contributions due to the nonvanishing pseudoscalar coupling constants g P and c P in Eqs. ( 7) and (11), respectively. The contributions depend on the TP vectors through the four combinations…”

Section: Standard Model Versus Anomalous Coupling Contributionsmentioning

confidence: 99%

Probing scalar particle and unparticle couplings in e+ e- -> t tbar with transversely polarized beams

Groote,

Liivat,

Ots

et al. 2009

Preprint

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In searching for indications of new physics scalar particle and unparticle couplings in e + e − → t t, we consider the role of transversely polarized initial beams at e + e − colliders. By using a general relativistic spin density matrix formalism for describing the particles spin states, we find analytical expressions for the differential cross section of the process with t or t polarization measured, including the anomalous coupling contributions. Thanks to the transversely polarized initial beams these contributions are first order anomalous coupling corrections to the Standard Model (SM) contributions. We present and analyse the main features of the SM and anomalous coupling contributions. We show how differences between SM and anomalous coupling contributions provide means to search for anomalous coupling manifestations at future e + e − linear colliders.

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Spin polarization and alignment of the single Z boson from ee annihilation

Cited by 9 publications

References 5 publications

Symmetries and similarities for spin orientation parameters in at SM thresholds

Symmetries and similarities for spin orientation parameters in at SM thresholds

New physics in e + e − → Zγ at the ILC with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings

Probing scalar particle and unparticle couplings in e+ e- -> t tbar with transversely polarized beams

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