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 Forward Tevatron Tops and Backward LHC Tops with Associates


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The anomalous forward-backward asymmetry (A FB) in t tbar production at the Tevatron is in apparent contradiction with the t tbar charge asymmetry (A C) measurements at the LHC, which agree well with the standard model predictions. We argue that associated production of a state with u tbar flavor quantum numbers can lead to a sizable negative contribution to A C. Exchange of such a resonance in the t-channel would lead to positive contributions to A FB and A C, as has been extensively discussed in the literature. Given the additional negative A C contribution, both the Tevatron and LHC data can be naturally accommodated within this framework. A simple realization of this setup is the well known example of a Z with flavor off-diagonal up-top couplings. We provide a detailed study of this model, demonstrating that it indeed reproduces the t tbar asymmetry data, and is compatible with other constraints, e.g. t+jet resonance searches, t tbar inclusive jet multiplicities, and atomic parity violation.



Author: Jure Drobnak; Alexander L. Kagan; Jernej F. Kamenik; Gilad Perez; Jure Zupan

Source: https://archive.org/







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