Search for flavor changing neutral currents in decays of top quarks

Abstract

We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for ttbar -> l'null + jets (l, l' = e, mu) final states using 4.1 fb^-1 of integrated luminosity of ppbar collisions at sqrt(s) = 1.96 TeV. We extract limits on the branching ratio B(t -> Zq) (q = u, c quarks), assuming anomalous tuZ or tcZ couplings. We do not observe any sign of such anomalous coupling and set a limit of B < 3.2% at 95% C.L.

10 pages, 5 figures, Submitted to Physics Letters B. Paper updated Sept. 7, 2011 to include PLB referee's comments and suggestions

References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Theoretical status and prospects for top-quark pair production at hadron colliders
• Flavor Physics in the Randall-Sundrum Model: I. Theoretical Setup and Electroweak Precision Tests
• Search for W' bosons decaying to an electron and a neutrino with the D0 detector
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
• Combined effects of strong and electroweak FCNC effective operators in top quark physics at the LHC
• Measurement of the $WZ\to \ell \nu \ell \ell$ cross section and limits on anomalous triple gauge couplings in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV
• QCD Corrections to Flavor Changing Neutral Coupling Mediated Rare Top Quark Decays

Cited by in corpus (39)

• A global approach to top-quark flavor-changing interactions
• Single top production in association with a Z boson at the LHC
• Search for flavor-changing neutral currents in top-quark decays t to Zq in pp collisions at sqrt(s) = 8 TeV
• Search for single-top production in ep collisions at HERA
• A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV
• Search for anomalous single top quark production in association with a photon in pp collisions at sqrt(s) = 8 TeV
• Top Quark Physics at the LHC: A Review of the First Two Years
• Search for flavour-changing neutral current top-quark decays $t\to qZ$ in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for flavor changing neutral currents in top quark decays in pp collisions at 7 TeV
• Single top quark production as a probe of anomalous $tq\gamma$ and $tqZ$ couplings at the FCC-ee
• Single top-quark production at the Tevatron and the LHC
• Search for flavour-changing neutral current top-quark decays to $qZ$ in $pp$ collision data collected with the ATLAS detector at $\sqrt{s}=8$ TeV
• Exploring top quark FCNC within 2HDM type III in association with flavor physics
• Probing top anomalous couplings at the LHC with trilepton signatures in the single top mode
• Single top quark production at the LHC
• Constraining top quark flavor violation and dipole moments through three and four top quark productions at the LHC
• Photon initiated single top quark production via flavor-changing neutral currents at the LHC
• Probing the top quark flavor-changing couplings at CEPC
• Anomalous $tqZ$ coupling effects in rare B- and K-meson decays
• Search for top quark flavour changing neutral currents in same-sign top quark production
• Top Quark Physics at the Tevatron
• What can We Learn from Triple Top-Quark Production?
• Constraints on anomalous $tcZ$ coupling from $\bar{B}\to {\bar{K}}^{\ast }{\mu }^{+}{\mu }^{-}$ and $B_s\to {\mu }^{+}{\mu }^{-}$ decays
• MEtop - a generator for single top production via FCNC interactions
• Search for flavor-changing neutral-current couplings between the top quark and the $Z$ boson with proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Higgs Quark Flavor Violation: Simplified Models and Status of General Two-Higgs-Doublet Model
• Review of Searches for Rare Processes and Physics Beyond the Standard Model at HERA
• Loop induced top quark FCNC through top quark and dark matter interactions
• Properties of the Top Quark
• Probing the anomalous $tq\gamma$ couplings through single top production at the future lepton-hadron colliders
• Constraining Unparticles from Top Physics at TeVatron
• Light axigluon and single top production at the LHC
• Probing FCNC couplings in single top quark production associated with a neutral gauge boson at future lepton colliders
• Top Quark Physics at the Tevatron
• Rare top decay t-> c l+l- as a probe of new physics
• Probing the anomalous tqgamma couplings in photon-proton collisions
• Recent studies of top quark properties and decays at hadron colliders
• Investigation of the FCNC couplings between the top quark and the photon in $\gamma \gamma$ and ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions at the CLIC
• Measurement of the inclusive ttgamma cross section at sqrt(s) = 7 TeV with the ATLAS detector