Search for Top Quark FCNC Couplings in Z' Models at the LHC and CLIC

Abstract

The top quark is the heaviest particle to date discovered, with a mass close to the electroweak symmetry breaking scale. It is expected that the top quark would be sensitive to the new physics at the TeV scale. One of the most important aspects of the top quark physics can be the investigation of the possible anomalous couplings. Here, we study the top quark flavor changing neutral current (FCNC) couplings via the extra gauge boson Z' at the Large Hadron Collider (LHC) and the Compact Linear Collider (CLIC) energies. We calculate the total cross sections for the signal and the corresponding Standard Model (SM) background processes. For an FCNC mixing parameter x=0.2 and the sequential Z' mass of 1 TeV, we find the single top quark FCNC production cross sections 0.38(1.76) fb at the LHC with sqrt{s_{pp}}=7(14) TeV, respectively. For the resonance production of sequential Z' boson and decays to single top quark at the Compact Linear Collider (CLIC) energies, including the initial state radiation and beamstrahlung effects, we find the cross section 27.96(0.91) fb at sqrt{s_{e^{+}e^{-}}}=1(3) TeV, respectively. We make the analysis to investigate the parameter space (mixing-mass) through various Z' models. It is shown that the results benefit from the flavor tagging.

20 pages, 17 figures, 6 tables

References in corpus (7)

• Improved Constraints on Z' Bosons from Electroweak Precision Data
• Constraints on flavor-changing Z' models by B_s mixing, Z' production, and B_s -> μ^+ μ^-
• Family Non-universal $U(1{)}^{\prime }$ Gauge Symmetries and $b\to s$ Transitions
• $B_s-{\bar{B}}_s$ Mixing constraints on FCNC and a non-universal $Z^{\prime }$
• Single Top-Quark Production in Flavor-Changing Z' Models
• Non-universal gauge boson $Z^{\prime }$ and the spin correlation of top quark pair production at $e^{-}{e}^{+}$ colliders
• Combined analysis of Z' -> t tbar and Z' -> t tbar j production for vector resonance searches at LHC

Cited by in corpus (10)

• Top quark forward-backward asymmetry, FCNC decays and like-sign pair production as a joint probe of new physics
• Probe of electromagnetic moments of the tau lepton in gamma-gamma collisions at the CLIC
• The Prediction of Mass of Z'-Boson from $b_q^0-b_q^{0}bar$ Mixing
• Constraining top quark flavor violation and dipole moments through three and four top quark productions at the LHC
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• Search for $t{Z}^{\prime }$ associated production induced by $tc{Z}^{\prime }$ couplings at the LHC
• Same-sign top pair plus $W$ production in flavor changing vector and scalar models
• Probing the anomalous $tq\gamma$ couplings through single top production at the future lepton-hadron colliders
• Probing the anomalous tqgamma couplings in photon-proton collisions
• Investigation of the FCNC couplings between the top quark and the photon in $\gamma \gamma$ and ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions at the CLIC