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Search for the neutral current top quark decay t -> Zc using the ratio of Z-boson+4 jets to W-boson+4 jets production

AuthorsCDF Collaboration; Cabrera, Susana CSIC ORCID; Cuenca Almenar, Cristóbal CSIC; Álvarez González, B.; Casal, Bruno CSIC; Cuevas, Javier CSIC ORCID; Gómez, G. CSIC ORCID ; Rodrigo, Teresa CSIC ORCID ; Ruiz Jimeno, Alberto ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar, Rocío CSIC ORCID; Aaltonen, T.
Issue Date8-Sep-2009
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 80 (5): 052001 (2009)
AbstractWe have used the Collider Detector at Fermilab (CDF-II) to search for the flavor-changing neutral-current (FCNC) top-quark decay t -> Zc using a technique employing ratios of W and Z production, measured in p (p) over bar data corresponding to an integrated luminosity of 1.52 fb(-1). The analysis uses a comparison of two decay chains, p (p) over bar -> t (t) over bar -> WbWb -> l nu bjjb and p (p) over bar -> t (t) over bar -> ZcWb -> llcjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the modeling of acceptance and efficiency for lepton identification over the multiyear data set using another ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z bosons. To improve the discrimination against standard model backgrounds to top-quark decays, we calculate the top-quark mass for each event with two leptons and four jets assuming it is a t (t) over bar event with one of the top quarks decaying to Zc. For additional background discrimination we require at least one jet to be identified as originating from a b quark. No significant signal is found and we set an upper limit on the FCNC branching ratio Br(t -> Zc) using a likelihood constructed from the llcjjb top-quark mass distribution and the number of l nu bjjb events. Limits are set as a function of the helicity of the Z boson produced in the FCNC decay. For 100% longitudinally-polarized Z bosons we find limits of 8.3% and 9.3% (95% C. L.) depending on the assumptions regarding the theoretical top-quark pair production cross section.
Publisher version (URL) 10.1103/PhysRevD.80.052001
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