Charged Z′ to conciliate the apparent disagreement between tt̅ Tevatron forward-backward asymmetry and LHC charge asymmetry
EZEQUIEL ALVAREZ; ESTEFANIA COLUCCIO LESKOW
PHYSICAL REVIEW D - PARTICLE AND FILDS
Lugar: Oak Ridge; Año: 2012 vol. 86 p. 114034 - 114034
We propose a charged, electrically neutral, and flavor-changing Z′ model to conciliate the apparent disagreement between the important excess found in the tt̅ Tevatron forward-backward asymmetry and the nullcompatible with negativeresults found in the LHC charge asymmetry. We show that this model contributes positively to the forward-backward asymmetry, whereas naturally a new cancellation is turned on at the LHC, yielding a null, or even negative, charge asymmetry. We find the region in parameter space that is simultaneously allowed by the stringent Tevatron and LHC observables. We show that the model is safe to atomic parity violation constraints and propose a possible increase in the Z′ width to avoid restrictions coming from tj/t̅ j resonance searches and tt̅ j cross section. We evaluate the constraints to the model, as well as distinctive features in the forecoming experimental results.