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Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2009 Jan 30;102(4):041801. doi: 10.1103/PhysRevLett.102.041801. Epub 2009 Jan 27.
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 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 Collider Dectector at Fermilab II detector in pp[over ] 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, approximately 11 signal events are expected over a background of 2.1+/-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).
基本粒子物理学中的最大味破坏（MxFV）模型可能至少包含一个新的标量SU(2) 二重态场Phi(FV)=(eta(0),eta(+))，它通过拉格朗日项L(FV)=xi(13)Phi(FV)q(1)q(3)将第一代和第三代夸克（q_(1), q_(3)）耦合起来。这些模型具有同电荷顶夸克对的独特特征，并规避了介子混合测量中的味改变限制。分析了费米实验室II探测器在sqrt[s]=1.96 TeV的质子-质子对撞中收集的对应于2 fb(-1)的数据，以寻找MxFV特征的证据。对于质量m_(eta;(0))=200 GeV/c(2)且耦合xi(13)=1的中性标量eta(0)，在2.1±1.8个本底事件的背景下预计约有11个信号事件。在数据中观测到3个事件，与本底预期一致，并对质量m(eta(0)=180 - 300 GeV/c(2)时的耦合xi(13)设置了限制。
