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Electroweak O(alpha) Corrections to W+W- Pair Production in Polarized gamma-gamma Collisions

G. Jikia

TL;DR

This work provides a complete ${\mathcal{O}}(\alpha)$ electroweak correction calculation for γγ→W+W− with polarized initial photons, including virtual, soft and hard photon and Z-boson emissions. The corrections are substantial and energy-dependent, becoming strongly negative at higher energies, with real emission partially cancelling virtual bosonic effects. The analysis demonstrates that precise SM predictions are necessary to extract potential new-physics signals in W-boson interactions, and it highlights the central region as particularly sensitive to loop effects while forward/backward channels remain comparatively stable. The study also discusses the role of such processes as both a precision testbed for the electroweak sector and a potential luminosity monitor for γγ colliders.

Abstract

Full O(alpha) electroweak corrections for gamma-gamma-> W+W- are calculated including virtual corrections, soft and hard real photon and Z-boson emission. The corrections are quite large ranging from -2.5% at 500 GeV to -18% at 2 TeV, |cosθ^\pm| < cos(10^\circ). Contributions from real photon and Z-boson emission are important at high energies where they partly cancel large negative contribution originating from virtual bosonic corrections. Precision measurements that intend to uncover physics beyond the standard model must necessarily make use of the full standard model predictions including O(alpha) corrections.

Electroweak O(alpha) Corrections to W+W- Pair Production in Polarized gamma-gamma Collisions

TL;DR

This work provides a complete electroweak correction calculation for γγ→W+W− with polarized initial photons, including virtual, soft and hard photon and Z-boson emissions. The corrections are substantial and energy-dependent, becoming strongly negative at higher energies, with real emission partially cancelling virtual bosonic effects. The analysis demonstrates that precise SM predictions are necessary to extract potential new-physics signals in W-boson interactions, and it highlights the central region as particularly sensitive to loop effects while forward/backward channels remain comparatively stable. The study also discusses the role of such processes as both a precision testbed for the electroweak sector and a potential luminosity monitor for γγ colliders.

Abstract

Full O(alpha) electroweak corrections for gamma-gamma-> W+W- are calculated including virtual corrections, soft and hard real photon and Z-boson emission. The corrections are quite large ranging from -2.5% at 500 GeV to -18% at 2 TeV, |cosθ^\pm| < cos(10^\circ). Contributions from real photon and Z-boson emission are important at high energies where they partly cancel large negative contribution originating from virtual bosonic corrections. Precision measurements that intend to uncover physics beyond the standard model must necessarily make use of the full standard model predictions including O(alpha) corrections.

Paper Structure

This paper contains 7 sections, 34 equations, 9 figures, 2 tables.

Table of Contents

  1. Introduction
  2. The $\gamma\gamma\to W^+W^-$ helicity amplitudes
  3. Born Cross Sections
  4. ${\cal O}(\alpha)$ corrections
  5. The structure of leading corrections
  6. Numerical results
  7. Conclusions

Figures (9)

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