Effects of unparticle on top spin correlation at the Large Hadron Collider

Abstract

We study effects of the scale invariant hidden sector, unparticle, proposed by Georgi, on top spin correlation at the Large Hadron Collider. Assuming no flavor changing interaction between the unparticles and the Standard Model particles, there arises the top-antitop quark pair production process through virtual unparticle exchanges in the s-channel in addition to the Standard Model processes. In particular, we consider contributions of scalar and vector unparticles and find that these make sizable deviations of the top spin correlation from the Standard Model one.

29 pages, 1 table, 12 figures, 2 figures added, typos in captions corrected, version accepted for publication in PRD

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• Measurement of ttbar Spin Correlation in ppbar Collisions Using the CDF II Detector at the Tevatron
• New physics effects on top quark spin correlation and polarization at the LHC: a comparative study in different models
• Probe of unparticles at the LHC in exclusive two lepton and two photon production via photon-photon fusion
• Breaking down the entire spectrum of spin correlations of a pair of particles involving fermions and gauge bosons
• Color Triplet Diquarks at the LHC
• On two-body and three-body spin correlations in leptonic $t\bar{t}Z$ production and anomalous couplings at the LHC
• Search for New Physics in Rare Top Decays: $t\bar{t}$ Spin Correlations and Other Observables
• Polarization of top quark in vector-like quark decay
• Top Quark Asymmetries and Unparticle Physics
• Implications of effective axial-vector coupling of gluon for $t\bar{t}$ spin polarizations at the LHC
• One-loop effects on top pair production in the littlest Higgs model with T-parity at the LHC
• Constraining Unparticles from Top Physics at TeVatron
• The scalars from the topcolor scenario and the spin correlations of the top pair production at the LHC