Speaker
Dr
Grégory Moreau
(LPT/University Paris 11, France)
Description
Since a decade, there have been extensive developments about an alternative to supersymmetry: 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 naturally 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 (A^b_FB) and the recent Tevatron anomalies on the top asymmetry (A^t_FB) could be interpreted as
early signatures of the warped models. We will discuss warped model realizations allowing to explain both
A^b_FB and A^t_FB [measured as a function of the ttbar invariant mass and the top rapidity], taking into account the constraints issued from dijet production rates at LHC.
The other constraints from the measurements of top pair production cross section sigma_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.
There are typically two types of predicted signatures at LHC: a resonance
peak in the ttbar 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 some of our previous studies as well as on a work in progress.
Author
Dr
Grégory Moreau
(LPT/University Paris 11, France)
