Optimal Beam Polarizations for New-Physics Search through gamma gamma -> t tbar -> lX/bX

Abstract

We perform an optimal-observable analysis of the final charged-lepton/b-quark momentum distributions in gamma+gamma -> t+tbar -> lX/bX for various beam polarizations in order to study possible anomalous t-tbar-gamma, tbW and gamma-gamma-H couplings, which could be generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators. We find optimal beam polarizations that will minimize the uncertainty in determination of those non-standard couplings. We also compare e+ebar and gamma+gamma colliders from the viewpoint of the anomalous-top-quark-coupling determination.

Final version, published in JHEP : more detailed description of the basic framework given with some new references, and three related appendices added

References in corpus (1)

• Top quark pair production and decay at a polarized photon collider

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