Speaker
Gregory Moreau
(LPT Orsay)
Description
Since a decade, there have been extensive developments about an alternative to super- symmetry: the scenarios with warped extra dimensions. Those constitute a new paradigm in the sense that they are dual, through the AdS/CFT correspondence, to composite Higgs models. These scenarios predict strong deviations from the Standard Model mainly in the bottom and top quark sector. In that sense, the LEP anomaly on Forward-Backward bottom asymmetry (Ab FB) and the recent Tevatron anomalies on the top asymmetry At FB could be interpreted as early signatures of the warped models. We will discuss warped model real- izations allowing to explain both Ab FB and At FB, taking into account the constraints issued from dijet production rates at LHC. The other constraints from the measurements of top pair production cross section _ttbar at LHC will be studied. Then, I will describe what are the predictions of these warped models at LHC, pointing out the complementarity between Tevatron and LHC on top physics (I will also mention the possibilities for measuring top asymmetries at LHC). There are typically two types of predicted signatures at LHC: a resonance peak in the t tbar invariant mass distribution (due to the exchange of a Kaluza-Klein excitation of the gluon) or the production of exotic colored fermions around a few hundred's of GeV. The results presented here are based on our works in Ref. [1], Ref. [2] and Ref. [3].
[1] A. Djouadi, G. Moreau and F. Richard, Nucl. Phys. B773 (2007) 43, hep-ph/0610173.
[2] A. Djouadi, G. Moreau, F. Richard and R. K. Singh, Phys. Rev. D82 (2010) 071702, arXiv:0906.0604 [hep-ph].
[3] A. Djouadi, G. Moreau and F. Richard, arXiv:1105.3158 [hep-ph].
