Forward-Backward t tbar Asymmetry from Anomalous Stop Pair Production

Abstract

We analyse a simple Standard Model (SM) extension with only two new light fields: a scalar partner of the top (stop) (with mass above m_t) and a light neutral fermion chi^0 (with mass of a few GeV), coupled to SM quarks via a Yukawa interaction. We show that such model can lead to a significant enhancement of the forward-backward asymmetry in t tbar production at the Tevatron via the additional t tbar pairs produced from (stop anti-stop) decays. The model satisfies existing constraints on new-physics searches both at low and high energies, and could even address the cosmological dark-matter abundance. The implications for future searches at the LHC are briefly outlined.

7 pages, 1 figure; few typos and numerical errors corrected; extended phenomenological discussions; added note on the possible impact in W+jj; conclusions unchanged

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• Top-flavored dark matter and the forward-backward asymmetry
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• Flavor Symmetric Sectors and Collider Physics
• Implications of the CDF t \bar t Forward-Backward Asymmetry for Hard Top Physics
• $A_{FB}^t$ Meets LHC
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• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
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• New physics contributions to the forward-backward asymmetry at the Tevatron
• Ultraviolet Completions of Axigluon Models and Their Phenomenological Consequences
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