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2011

CP violation in tbW couplings at the LHC

Rindani, Saurabh D., Sharma, Pankaj

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We study in a model-independent way anomalous CP-violating tbW effective couplings that might arise from new physics in the processes pp-> tW^- X and pp-> tbar W^+X, followed by semileptonic decay of t and tbar.

These processes have a dependence on effective tbW couplings both in the production process as well as in the decay of the t or tbar.
We propose several CP-violating asymmetries constructed out of variables in the two processes, including t and tbar polarization, and energy and azimuthal angles of the decay particles.
We find that it is feasible to probe a certain CP-violating combination of anomalous couplings at the per cent level at the LHC for centre-of-mass energy 14 TeV and an integrated luminosity of 10 fb^{-1}.

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