R - parity violating decays of the Top - Quark and the Top - Squark at the Tevatron a
نویسنده
چکیده
We study unconventional decays of the top-quark and the top-squark in the framework of SUSY models with broken R-parity. The model under study is the MSSM with an additional bilinear term that breaks R-parity. In this model the top-squark behaves similar to a third generation leptoquark. We demonstrate that existing Tevatron data on the top give rise to restrictions on the SUSY parameter space. In particular, we focus on scenarios where the tau-neutrino mass is smaller than 1 eV. We give an exclusion plot derived from the leptoquark searches at Tevatron.
منابع مشابه
Direct probes of R-parity-violating supersymmetric couplings via single-top-squark production
We study the s-channel production of a single top squark in hadron collisions through an R-parity-violating mechanism, examining in detail the case in which the squark decays through an R-parity-conserving process into a bottom quark, a lepton, and missing energy. We show that the top squark can be discovered if its mass is less than 400 GeV, or that the current bound on the size of the R-parit...
متن کاملConstraining top squark in R-parity violating SUSY model using existing Tevatron data
Signal of lighter top squark has been looked for using Tevatron data in the dielectron plus di-jet channel. We find that the mass of the lighter top squark when it decays dominantly in the electron plus jet channel, can be ruled out up to 220 GeV at 95% C.L. using di-electron data. In the framework of R-parity breaking SUSY model we exclude relevant R-parity violating couplings for a range of t...
متن کاملSingle top quark production as a probe of R-parity-violating SUSY at pp and pp̄ colliders
We investigate the ability of single top quark production via qq → squark → tb and qq̄ → slepton → tb̄ at the LHC and Tevatron to probe the strength of R-parity violating couplings in the minimal supersymmetric model. We found that given the existing bounds on R-parity violating couplings, single top quark production may be greatly enhanced over that predicted by the standard model, and that both...
متن کاملProbing R-parity violating models of neutrino mass at the Tevatron via top Squark decays
We have estimated the limiting branching ratio of the R-parity violating (RPV) decay of the lighter top squark, t̃1 → ld (l = e or μ and d is a down type quark of any flavor), as a function of top squark mass(mt̃1) for an observable signal in the di-lepton plus di-jet channel at the Tevatron RUN-II experiment with 2 fb luminosity. Our simulations indicate that the lepton number violating nature o...
متن کاملFlavor-changing top quark decays in R-parity-violating supersymmetric models
The flavor changing top quark decays t → cV (V = Z, γ, g) induced by R-parity-violating couplings in the minimal supersymmetric standard model (MSSM) are evaluated. We find that the decays t → cV can be significantly enhanced relative to those in the R-parity conserving SUSY model. Our results show that the top quark FCNC decay can be as large as Br(t → cg) ∼ 10−3, Br(t → cZ) ∼ 10−4 and Br(t → ...
متن کامل