Collider-independent t¯t forward-backward asymmetries
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Forward-backward (FB)LHC (Large Hadron Collider)AsymmetriesTevatron
SponsorshipThis work has been supported by projects FPA2006-05294 and FPA2010-17915 (MICINN), FQM 101, FQM 03048 and FQM 6552 (Junta de Andalucía).
We introduce the forward-backward asymmetries Au, Ad corresponding to u¯u, d ¯ d -> t¯t production, respectively, at hadron colliders. These are collider- and center-of-mass-independent observables, directly related to the forward-backward and charge asymmetries measured at the Tevatron and the LHC, respectively. We discuss how to extract these asymmetries from data. Because these asymmetries are collider-independent, their measurement at these two colliders could elucidate the nature of the anomalous forward-backward asymmetry measured at the Tevatron. Our framework also shows in a model-independent fashion that a positive Tevatron asymmetry exceeding the standard model expectation is compatible with the small asymmetry measured at the LHC.