Probing CP Violation in $\gamma \gamma \to W^{+}{W}^{-}$ with Polarized Photon Beams

Abstract

We demonstrate in a general framework that polarized photons by backscattered laser beams of adjustable frequencies at a TeV linear $e^{+}{e}^{-}$ collider provide us with a very efficient mechanism to probe CP violation in two-photon collisions. CP violation in the process $\gamma \gamma \to W^{+}{W}^{-}$ is investigated in detail with linearly polarized photon beams. There are two useful CP-odd asymmetries that do not require detailed information on $W$ decay products. The sensitivity to the CP-odd form factors are studied quantitatively by assuming a perfect $e$-$\gamma$ conversion and the 20 fb${}^{-1}$ $e^{+}{e}^{-}$ integrated luminosity at the $e^{+}{e}^{-}$ c.m. energies $\sqrt{s}=0.5$ and $1.0$ TeV. The sensitivity is so high that such experiments will allow us to probe new CP violation effects beyond the limits from some specific models with reasonable physics assumptions. We find that a counting experiment of $W^{+}{W}^{-}$ events in the two-photon mode with adjustable laser frequencies can have much stronger sensitivity to the CP-odd $\gamma (\gamma )WW$ form factors than can a $W^{+}{W}^{-}$ decay-correlation experiment with a perfect detector achieve in the $e^{+}{e}^{-}$ mode. PACS number(s): 14.70.Bh, 14.70.Hp, 13.88.+e

37 pages, RevTex, 1 Tex file and 6-page postscript figures uuencoded together, also available at ftp://theory.kek.jp/kek/preprints/TH/kekth456.uu

References in corpus (10)

• Patterns of Deviation from the Standard Model
• Prospects of Measuring the Parity of Higgs Particles
• Using Back-Scattered Laser Beams to Detect CP Violation in the Neutral Higgs Sector
• Probing the Scalar Sector in $e^{+}{e}^{-}\to f\bar{f}H$
• Probing the Top-Quark Electric Dipole Moment at a Photon Linear Collider
• Determining the CP-eigenvalues of the Neutral Higgs Bosons of the Minimal Supersymmetric Model in $\gam\gam$ Collisions
• Probing Higgs Sector CP Violation with Top Quarks at a Photon Linear Collider
• Transverse Polarization of Top Quarks Produced at a Photon-Photon Collider
• CP Test in the W Pair Production via Photon Fusion at NLC
• Probing Anomalous Triple Boson Vertices at Future $e^{+}{e}^{-}$ Colliders

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• CP violation in tbW couplings at the LHC
• Lorentz-violating effects on pair production of W bosons in photon collisions
• Higgs, SUSY and the Standard Model at $\gamma \gamma$ Colliders
• Effective-Lagrangian approach to gamma gamma --> WW; I: Couplings and amplitudes
• The γγ\to ϕ_iϕ_j processes in the type-III two-Higgs-doublet model
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• New Physics Signatures in Dijets at Hadron Colliders