CP violation at a linear collider with transverse polarization

Abstract

We show how transverse beam polarization at $e^{+}{e}^{-}$ colliders can provide a novel means to search for CP violation by observing the distribution of a single final-state particle without measuring its spin. We suggest an azimuthal asymmetry which singles out interference terms between standard model contribution and new-physics scalar or tensor effective interactions in the limit in which the electron mass is neglected. Such terms are inaccessible with unpolarized or longitudinally polarized beams. The asymmetry is sensitive to CP violation when the transverse polarizations of the electron and positron are in opposite senses. The sensitivity of planned future linear colliders to new-physics CP violation in $e^{+}{e}^{-}\to t\bar{t}$ is estimated in a model-independent parametrization. It would be possible to put a bound of $\sim 7$ TeV on the new-physics scale $\Lambda$ at the 90% C.L. for $\sqrt{s}=500$ GeV and $\int dt\mathcal{L}=500{\mathrm{fb}}^{-1}$, with transverse polarizations of 80% and 60% for the electron and positron beams, respectively.

15 pages, latex, includes 5 figures. This version (v3) corresponds to publication in Physical Review; extended version of v2 which corresponded to LC note LC-TH-2003-099 with corrected figure captions

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• TESLA Technical Design Report Part I: Executive Summary
• More Transverse Polarization Signatures of Extra Dimensions at Linear Colliders
• Simple decay-lepton asymmetries in polarized e+e- -> t tbar and CP-violating dipole couplings of the top quark
• Weak dipole moment of $\tau$ in $e^{+}{e}^{-}$ collisions with longitudinally polarized electrons
• Measurement of the $\tau$ electric dipole moment using longitudinal polarization of $e^{+}{e}^{-}$ beams
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• Angular distributions as a probe of anomalous ZZH and gammaZH interactions at a linear collider with polarized beams
• On the choice of beam polarization in $e^{+}{e}^{-}\to ZZ/Z\gamma$ and anomalous triple gauge-boson couplings
• CP sensitive observables in chargino production with transverse $e^{\pm }$ beam polarization
• Use of transverse beam polarization to probe anomalous VVH interactions at a Linear Collider
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• CP violation in unpolarized e^+ e^- to charginos at one loop level
• Transverse beam polarization and limits on leptoquark couplings in e+e- --> t tbar
• New physics in e+ e- -> Z gamma with polarized beams
• Selectron production at an e-e- linear collider with transversely polarized beams
• Production and decay of hyperons in a transversely polarized electron-positron collider
• Charged lepton distributions as a probe of contact e+e-HZ interactions at a linear collider with polarized beams
• Space-time structure of new physics with polarized beams at the linear collider
• Generation of polarized positron beams via collisions of ultrarelativistic electron beams
• Two-particle kinematic distributions from new physics at an electron-positron collider with polarized beams
• Top-spin analysis of new scalar and tensor interactions in e^+ e^- collisions with beam polarization
• Comparison of electric dipole moments and the Large Hadron Collider for probing CP violation in triple boson vertices
• Use of Transverse polarization to probe R-parity violating supersymmetry at ILC
• Generalized top-spin analysis and new physics in $e^{+}{e}^{-}$ collisions with beam polarization
• Inclusive spin-momentum analysis and new physics at a polarized electron-positron collider
• Probing scalar particle and unparticle couplings in e+ e- -> t tbar with transversely polarized beams
• Probing space-time structure of new physics with polarized beams at the ILC