Bhabha vs. Moller scattering as a contact-interaction analyzer at a polarized Linear Collider

Abstract

We discuss electron-electron contact-interaction searches in the Bhabha and Moller processes at planned Linear Colliders run in the electron-positron and electron-electron modes, with longitudinally polarized beams. Our analysis is based on the measurement, for the two processes, of polarized differential cross sections that allow to disentangle the different, independent, four-fermion couplings. We evaluate by a model-independent analysis the sensitivities to the contact coupling constants, emphasizing the role of the available beam polarization and the complementarity of the two processes in giving the best limits. We also make a comparison with the potential of $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ at the same energy and beams polarization.

18 latex pages, 15 eps figs., some misprints corrected and added refs

References in corpus (3)

• Constraints on Electron-quark Contact Interactions and Implications to models of leptoquarks and Extra Z Bosons
• Hint for axial-vector contact interactions in the data on e+e- -> e+e-(gamma) at centre-of-mass energies 192-208 GeV
• New physics signatures at a Linear Collider: model-independent analysis from `conventional' polarized observables

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• Distinguishing New Physics Scenarios at a Linear Collider with Polarized Beams
• Physics aspects of polarized e+ at the linear collider
• Electroweak Gauge Theories and Alternative Theories at a Future Linear e+e- Collider
• Distinguishing new physics scenarios with polarized electron and positron beams
• Revealing the large extra dimension effective interaction at an e^+e^- collider with polarized beams