Search for Maximal Flavor Violating Scalars in Same-Charge Lepton Pairs in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV

Abstract

Models of Maximal Flavor Violation (MxFV) in elementary particle physics may contain at least one new scalar SU$(2)$ doublet field ${\Phi }_{FV}=({\eta }^0,{\eta }^{+})$ that couples the first and third generation quarks ($q_1,q_3$) via a Lagrangian term ${\mathcal{L}}_{FV}={\xi }_{13}{\Phi }_{FV}{q}_1{q}_3$. These models have a distinctive signature of same-charge top-quark pairs and evade flavor-changing limits from meson mixing measurements. Data corresponding to 2 fb${}^{-1}$ collected by the CDF II detector in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV are analyzed for evidence of the MxFV signature. For a neutral scalar ${\eta }^0$ with $m_{{\eta }^0}=200$ GeV/$c^2$ and coupling ${\xi }_{13}=1$, $\sim$ 11 signal events are expected over a background of $2.1\pm 1.8$ events. Three events are observed in the data, consistent with background expectations, and limits are set on the coupling ${\xi }_{13}$ for $m_{{\eta }^0}=180-300$ GeV/$c^2$.

4 pages, 3 figures

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