Flavor changing scalar couplings and tγ(Z) production at hadron colliders
نویسندگان
چکیده
We calculate the contributions of the flavor changing scalar (FCS) couplings arised from topcolor-assisted technicolor (TC2) models at tree-level to the tγ and tZ production at the Tevatron and LHC experiments. We find that the production cross sections are very small at the Tevatron with √ s = 1.96TeV , which is smaller than 5 fb in most of the parameter space of TC2 models. However, the virtual effects of the FCS couplings on the tγ(Z) production can be easily detected at the LHC with √ s = 14TeV via the final state γlν̄b (lllν̄b). ∗E-mail:[email protected]
منابع مشابه
FCNC top quark production via anomalous tqV couplings beyond leading order
We calculate flavor-changing neutral-current (FCNC) processes involving top-quark production via anomalous tqV couplings at the Tevatron and HERA colliders. We cover the FCNC processes pp̄ → tZ, pp̄ → tγ, pp̄ → tt, and ep → et. We go beyond leading order and include the effects of soft-gluon corrections through next-to-next-to-leading order. We demonstrate the stabilisation of the cross section wi...
متن کاملSingle Top Quark Production via FCNC Couplings at Hadron Colliders
We calculate single top–quark production at hadron colliders via the chromo–magnetic flavor–changing neutral current couplings t̄cg and t̄ug. We find that the strength for the anomalous t̄cg (t̄ug) coupling may be probed to κc/Λ = 0.092 TeV −1 (κu/Λ = 0.026 TeV ) at the Tevatron with 2 fb of data and κc/Λ = 0.013 TeV −1 (κu/Λ = 0.0061 TeV) at the LHC with 10 fb of data. The two couplings may be dis...
متن کاملar X iv : h ep - p h / 96 12 38 8 v 1 1 7 D ec 1 99 6 Signals from Flavor Changing Scalar Currents at the Future Colliders ∗
We present a general phenomenological analysis of a class of Two Higgs Doublet Models with Flavor Changing Neutral Currents arising at the tree level. The existing constraints mainly affect the couplings of the first two generations of quarks, leaving the possibility for non negligible Flavor Changing couplings of the top quark open. The next generation of lepton and hadron colliders will offer...
متن کاملNeutral top-pion and tγ(z) production at the HERA and THERA colliders
In the context of top-color assisted technicolor (TC2) models, we calculate the contributions of the neutral top-pion π t to tγ and tz production via the processes ep → γc → tγ and ep → γc → tz at the HERA and THERA colliders. Our results show that the cross sections σtγ(s) and σtz(s) are very small at the HERA collider with √ s = 320GeV . However, in most of the parameter space, σtγ(s) and σtz...
متن کاملDiagnostic power of future colliders for Z' couplings to quarks and leptons: e+e- versus pp colliders.
We study the diagnostic power of future e+e− colliders with √ s = 500 GeV (the New Large Collider (NLC)) for a model independent determination of the Z ′ gauge couplings to quarks and leptons. The interference of the Z ′ propagator with the photon and the Z propagator in the two-fermion final state probes are sensitive to the magnitude as well as relative signs of quark and lepton charges. For ...
متن کامل