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The CDF collaboration has recently reported a large deviation from the standard model of the t \bar t forward-backward asymmetry in the high invariant mass region. We interpret this measurement as coming from new physics at a heavy scale Lambda, and perform a model-independent analysis up to O(1/Lambda^4). A simple formalism to test and constrain models of new physics is provided. We find that a large asymmetry cannot be accommodated by heavy new physics that does not interfere with the standard model. We show that a smoking gun test for the heavy new physics hypothesis is a significant deviation from the standard model prediction for the t \bar t differential cross section at large invariant mass. At M_{t\bar t}>1 TeV the cross section is predicted to be at least twice that of the SM at the Tevatron, and for M_{t\bar t}>1.5 TeV at least three times larger than the SM at the LHC.Comment: 12 pages, 3 figures. v2: Minor corrections in the text, references added. v3: Extended discussion on QCD NLO corrections, added short discussion on LHC dijet constraints; matches published versio

Topics:
High Energy Physics - Phenomenology

Year: 2011

DOI identifier: 10.1007/JHEP08(2011)031

OAI identifier:
oai:arXiv.org:1103.2297

Provided by:
arXiv.org e-Print Archive

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