“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 12718
School of Particles and Accelerator
  Title:   Top Quark Asymmetries and Unparticle Physics
1.  Sara Khatibi
2.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  87
  Vol.:  037701
  Year:  2013
  Supported by:  IPM
Among different measured observables of top-antitop quark pairs at hadron colliders, the forward-backward asymmetry (AFB) measured by the CDF and D0 collaborations has inconsistency with the Standard Model prediction. The measured forward-backward asymmetry grows with ttˉ invariant mass. Several new physics models have been proposed to explain this deviation. We consider the consistency of the parameter space of vector unparticle (in Flavor-Conserving scenario) with the existing ttˉ production measurements. In particular, we look at the total cross sections at the LHC and Tevatron, differential cross section with ttˉ invariant mass, and the LHC charge asymmetry to identify the regions in parameter space that can give the desired top AFB observed by the Tevatron. We show that in spite of the intrinsic tension between the LHC charge asymmetry and AFB, there exists a region in the unparticle parameters space where the top AFB and the LHC charge asymmetry are satisfied simultaneously. Finally, we show that the consistent region with ttˉ observables is consistent with the constraints coming from the dijet resonance searches

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