Anomalous effects ine + e − annihilation into boson pairs II.e + e −→ZZ, γZ, γγ

“…For this analysis it is assumed that λ = ±1. The expected differential cross-section is given by [16]: Instead of an ordinary electron an excited electron e * coupling to electron and photon could be exchanged in the t-channel of the process [13,17]. In the most general case e * eγ couplings would lead to a large anomalous magnetic moment of the electron on which strong experimental limits exist [18].…”

Section: Non-qed Modelsmentioning

confidence: 99%

Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP

2013

Physics Reports

593

446

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Electroweak measurements performed with data taken at the electron-positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3 fb −1 collected by the four LEP experiments ALEPH, DELPHI, L3 and OPAL, at centre-of-mass energies ranging from 130 GeV to 209 GeV.Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant WW and ZZ production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron-positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose-Einstein correlations between the two W decay systems arising in WW production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, m W and Γ W , the branching fraction of W decays to hadrons, B(W → had), and the trilinear gauge-boson selfcouplings g

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“…[22]. An earlier work discussing the implications of several different theoretical scenarios on the cross sections and angular distributions in e + e − → Zγ is [23].…”

Section: Discussionmentioning

confidence: 99%

New physics ine⁺e⁻→Zγ with polarized beams

Ananthanarayan

Rindani

2005

J. High Energy Phys.

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We present a complete description of angular distributions in the presence of new interactions for the process e + e − → Zγ with polarized beams at future linear colliders, by considering the most general form-factors allowed by gauge invariance. We include the possibility of CP violation, and classify the couplings according to their CP properties. Chirality conserving and chirality violating couplings give rise to distinct dependence on beam polarization. We present a comprehensive discussion including both types of couplings and provide a detailed comparison of the effects due to each. We discuss some selected asymmetries which would enable isolating effects of the CP-violating form-factors. We also present sensitivities on the corresponding couplings achievable at a future linear collider with realistic polarization and luminosity.

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Anomalous effects ine + e − annihilation into boson pairs II.e + e −→ZZ, γZ, γγ

Cited by 39 publications

References 13 publications

Theory of the Muon Anomalous Magnetic Moment

Theory of the Muon Anomalous Magnetic Moment

Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP

New physics ine⁺e⁻→Zγ with polarized beams

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Anomalous effects ine + e − annihilation into boson pairs II.e + e −→ZZ, γZ, γγ

Cited by 39 publications

References 13 publications

Theory of the Muon Anomalous Magnetic Moment

Theory of the Muon Anomalous Magnetic Moment

Electroweak measurements in electron–positron collisions at W-boson-pair energies at LEP

New physics ine+e−→Zγ with polarized beams

Contact Info

Product

Resources

About

New physics ine⁺e⁻→Zγ with polarized beams