Search for like-sign top quark pair production at CDF with 6.1 fb$^{-1}$

Search for like-sign top quark pair production at CDF with 6.1 fb$^{-1}$



V. Rusu, FNAL
D. Whiteson and R. Porter, UC Irvine
P. Wittich and P. Kittiwisit, Cornell
J. A. Aguilar-Saavedra, Granada

Abstract:
We search for production of same-sign top quark at CDF in data with 6.1 fb$^{-1}$ of luminosity. The observed data agree with the standard model predictions. We present limits on same-sign top quark pair production at CDF using effective operators.





Companion analysis: inclusive like-sign dileptons


Conference note
(Click each plot for EPS)


Distribution of missing transverse energy for observed events with two like-sign lepton and at least two jets (points). Stacked histograms indicate the expected background contributions, see Table~\ref{tab:yieldsjj
(Click each plot for EPS)


Distribution of $H_T$ for observed events with two like-sign lepton and at least two jets (points). Stacked histograms indicate the expected background contributions, see Table~\ref{tab:yieldsjj
(Click each plot for EPS)


Distribution of expected and observed data in $H_T$, with expected same-sign topquark pair signal overlaid.
(Click each plot for EPS)


Limits on same-sign top quark pair production in left-left, left-right, and right-right chirality modes. Left, in terms of cross-sections, compared to theory predictions for $C=1$. Right, expressed as limits on the $C$ coefficients. See Table~\ref{tab:res
(Click each plot for EPS)


Limits on two of four operator coefficients assuming the rest is zero. These make the conservative assumption that the kinematics of a combination of two modes ($LL$,$LR$,$RR$) can be described by the mode with the smallest efficiency, $LL$.
(Click each plot for PDF)


Relation between $A_{fb}$ and the coefficient $|C_{RR}|/\Lambda^{2}$ for flavour-violating $Z'$ model