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Register a new userProbing the Effects of Dimension-eight Operators Describing Anomalous Neutral Triple Gauge Boson Interactions at FCC-hh
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The effects of dimension-eight operators giving rise to anomalous neutral triple gauge boson interactions of $Zgammagamma$ and $Zgamma Z$ vertices in $ppto l^-l^+gamma$ and $ppto ubar u gamma$ are investigated at 100 TeV centre of mass energy of future circular hadron collider (FCC-hh). The transverse momentum of photon, invariant mass of $l^-l^+gamma$ and angular distribution of charged lepton in the rest frame of $l^-l^+$ and Missing Energy Transverse (MET) are considered in the analysis. The realistic detector effects are also included with Delphes simulation. Sensitivity limits obtained at 95% C.L. for $C_{widetilde B W}/Lambda^4$ and $C_{B B}/Lambda^4$ couplings are $[-0.52;0.52] ([-0.40;0.40])$ TeV$^{-4}$, $[-0.43;0.43] ([-0.33;0.33])$ TeV$^{-4}$ in the dilepton+photon channel and $[-0.11;0.11] ([-0.084;0.084])$ TeV$^{-4}$, $[-0.092;0.092] ([-0.072;0.072])$ TeV$^{-4}$ in the MET+photon channel with $L_{int}$=1 (3) ab$^{-1}$, respectively.
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The anomalous neutral triple gauge boson couplings (aNTGCs) for the Z gamma gamma and Z gamma Z vertices described by dimension-eight operators are examined through the process pp to l^{+}l^{-} gamma at the High-Luminosity Large Hadron Collider (HL-LHC). We performed an analysis on transverse momentum of photon and angular distribution of charged lepton in the final state including detector effects. Sensitivity limits of the C_{widetilde{B}W}, C_{BB} couplings are obtained at 95 % C.L. to constrain for the range [-1.88: 1.88] TeV^{-4}, [-1.47: 1.47] TeV^{-4} and [-1.14:1.14] TeV^{-4}, [-0.86: 0.86] TeV^{-4} with an integrated luminosity of 300 fb^{-1} and 3000 fb^{-1}, respectively.
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.
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.
In these proceedings I explore one aspect of gauge-boson physics at the LHC - Triple Gauge-boson Couplings (TGCs) in $WZ$ and Wgamma production. Methods for extracting confidence limits on anomalous TGCs are assessed, while accounting for the effects of higher order QCD corrections and contributions from other theoretical and detector related systematics. Detector response has been parametrised according to the ATLAS detectors specifications. A strategy for reporting the anomalous coupling limits is introduced which removes the ambiguities of form factors by reporting the limits as a function of a cutoff operating on the diboson system invariant mass. Techniques for measuring the energy dependence of anomalous couplings are demonstrated.
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$^{-1}$.
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