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Register a new userProbing anomalous $tqgamma$ and $tqg$ couplings via single top production in association with photon at FCC-hh
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We study the anomalous FCNC $tqgamma$ and $tqg$ couplings via $ppto Wbgamma+X$ signal process including realistic detector effects for both leptonic and hadronic decay channels of the W boson at 100 TeV FCC-hh. The relevant background are considered in the cut based analysis to obtain not only limits on the anomalous $lambda$ and $zeta$ couplings but also branching ratios of $tto qgamma$ and $tto qg$ decay channels. We find that the sensitivity to the branching ratio of $t to q gamma$ channel is three order better than the available LHC experimental limits, and it is comparable for the branching ratio of the $tto qg$ decay channel with an integrated luminosity of 10 ab$^{-1}$ at 2$sigma$ significance level.
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We study the sensitivity of anomalous neutral triple gauge couplings ($aNTGC$) via $pp rightarrow ZZ$ production in the 4$ell$ channel at 100 TeV centre of mass energy of future circular hadron collider, verbFCC-hh. The analysis including the realistic detector effects is performed in the mode where both Z bosons decay into same flavor, oppositely charged lepton pairs. The sensitivities to the charge-parity (CP)-conserving $C_{tilde{B}W} / Lambda^{4}$ and CP-violating $C_{WW} / Lambda^{4}$, $C_{BW} / Lambda^{4}$ and $C_{BB} / Lambda^{4}$ couplings obtained at 95% Confidence Level (C.L.) using the invariant mass distribution of 4$ell$ system reconstructing the leading and sub-leading Z boson candidates are $[-0.117, ,, +0.117]$, $[-0.293, ,, +0.292]$, $[-0.380, ,, +0.379]$, and $[-0.138, ,, +0.138]$ in the unit of TeV$^{-4}$, respectively.
We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) $tqZ$ couplings via two production processes yielding trilepton signals: top quark pair production $ppto tbar{t}$ with one top decaying to the $Z$ boson and one light jet and the anomalous single top plus $Z$ boson production process $ppto tZ$. We study these channels at various successors of the Large Hadron Collider~(LHC), i.e., the approved High-Luminosity LHC (HL-LHC) as well as the proposed High-Energy LHC~(HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for the signals and the relevant Standard Model (SM) backgrounds and obtain limits on the Branching Ratios (BRs) of $tto qZ~(q=u,c)$, eventually yielding a trilepton final state through the decay modes $tto b W^{+}to bell^{+} u_{ell}$ and $Zto ell^{+}ell^{-}$. The upper limits on these FCNC BRs at 95% Confidence Level (CL) are obtained at the HL-LHC with $sqrt s=14$ TeV and 3 ab$^{-1}$, at the HE-LHC with $sqrt s=27$ TeV and 15 ab$^{-1}$ as well as at the FCC-hh with $sqrt s=100$ TeV and 30 ab$^{-1}$.
We investigate the anomalous flavour changing neutral current (FCNC) interactions of top quark through the process $e^{-}pto e^{-}W^{pm}q+X$. We calculate the signal and background cross sections in electron proton collisions at Large Hadron electron Collider (LHeC) with a 7 TeV proton beam from the LHC and a new 60 GeV electron beam from energy recovery linac (ERL). We study the relevant background processes including one electron and three jets in the final state. The distributions of the invariant mass of two jets and an additional jet tagged as $b$-jet are used to account signal and background events after the analysis cuts. We find upper bounds on anomalous FCNC couplings $lambda$ of the order of $10^{-2}$ at LHeC for a luminosity projection of $100$ fb$^{-1}$ together with the fast simulation of detector effects. As a matter of interest, we analyze the sensitivity to the couplings $(lambda_{u},lambda_{c})$ and find an enhanced sensitivity to $lambda_{c}$ at the LHeC when compared to the results from the HERA.
The top quark flavor changing neutral current (FCNC) processes are extremely suppressed within the Standard Model (SM) of particle physics. However, they could be enhanced in a new physics model Beyond the Standard Model (BSM). The top quark FCNC interactions would be a good test of new physics at present and future colliders. Within the framework of the BSM models, these interactions can be described by an effective Lagrangian. In this work, we study tqgamma and tqZ effective FCNC interaction vertices through the process e-p->e-Wq+X at future electron proton colliders, projected as Large Hadron electron Collider (LHeC) and Future Circular Collider-hadron electron (FCC-he). The cross sections for the signal have been calculated for different values of parameters lambda_q for tqgamma vertices and kappa_q for $tqZ$ vertices. Taking into account the relevant background we estimate the attainable range of signal parameters as a function of the integrated luminosity and present contour plots of couplings for different significance levels including detector simulation.
This paper presents the projections on the anomalous neutral triple gauge couplings ($aNTGC$) via $pp rightarrow ZZ$ production in the 2$ell$2$ u$ final state at a 100 TeV proton-proton collider, verbFCC-hh. %100 TeV center of mass energy of The realistic verbFCC-hh detector environments and its effects taken into account in the analysis. The study is carried out in the mode where one Z boson decays into a pair of same-flavor, opposite-sign leptons (electrons or muons) and the other one decays to the two neutrinos. The new bounds on the charge-parity (CP)-conserving couplings $C_{widetilde{B}W} / Lambda^{4}$ and CP-violating couplings $C_{WW} / Lambda^{4}$, $C_{BW} / Lambda^{4}$ and $C_{BB} / Lambda^{4}$ achived at 95% Confidence Level (C.L.) using the transverse momentum of the dilepton system ($p_{T}^{ell ell}$) are $[-, 0.042, ,, +,0.042]$, $[-,0.050, ,, +,0.050]$, $[-,0.050, ,, +,0.050]$, and $[-,0.048, ,, +,0.048]$ in units of TeV$^{-4}$, respectively.
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