“School of Particles”
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| Paper IPM / Particles / 15435 |
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We investigate the prospect of the LHC for discovering new physics effects
via new strategies in the same-sign top pair and same-sign top pair associated with a W boson signatures.
Significant enhancement in production of same-sign top quarks (plus a W boson)
is a joint property of several models beyond the standard model.
We concentrate on the leptonic (electron and muon) decay of the top quarks
and study the exclusion reach of the LHC data for a simplified model approach
where top quark flavor changing could occur through a Z′ or a neutral scalar ϕ exchange.
Less background contributions and clean signature are the advantages of the leptonic decay
mode of the top quarks in the same-sign production processes.
A combination is performed on both same-sign top pair and same-sign top pair
plus a W boson production modes which enables us to reach a large fraction
of the model parameter space. Assuming the couplings of new physics of the order of 10−2,
the mass of a flavor changing Z′ or a neutral scalar above 1 TeV could be excluded.
We propose a momentum dependent charge asymmetry
and angular observables in the same-sign top process which provide the
possibility of separation of new physics signal from the SM backgrounds
as well as discrimination of the flavor changing tuX from tcX, where X = Z′,ϕ.
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