6533b855fe1ef96bd12b1c06
RESEARCH PRODUCT
Charge asymmetries of top quarks: a window to new physics at hadron colliders
Paola FerrarioGerman Rodrigosubject
PhysicsQuarkHistoryParticle physicsToy modelLarge Hadron ColliderPhysics beyond the Standard Modelmedia_common.quotation_subjectHigh Energy Physics::LatticeHadronFlavourHigh Energy Physics::PhenomenologyFísicaFOS: Physical sciencesObservableAsymmetryComputer Science ApplicationsEducationHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics::Experimentmedia_commondescription
With the next start of LHC, a huge production of top quarks is expected. There are several models that predict the existence of heavy colored resonances decaying to top quarks in the TeV energy range. A peak in the differential cross section could reveal the existence of such a resonance, but this is experimentally challenging, because it requires selecting data samples where top and antitop quarks are highly boosted. Nonetheless, the production of such resonances might generate a sizable charge asymmetry of top versus antitop quarks. We consider a toy model with general flavour independent couplings of the resonance to quarks, of both vector and axial-vector kind. The charge asymmetry turns out to be a more powerful observable to detect new physics than the differential cross section, because its highest statistical significance is achieved with data samples of top-antitop quark pairs of low invariant masses.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-07-01 |