Constraining Unparticles from Top Physics at TeVatron

Abstract

We study and analyze the recent observations of the top pair production $\sigma (p\bar{p}\to t\bar{t})$ at TeVatron through flavor conserving and flavor violating channels $via$ vector and tensor unparticles. The unparticle sector is considered with the possibility of being a color singlet or octet. The modified unparticle propagator is used to investigate the contribution of these unparticles to the observed $A_{FB}^{t\bar{t}}$ (forward backward asymmetry in top pair production) and the spin correlation at TeVatron. We have also studied the impact of the flavor violating couplings of unparticles to the third generation quarks on (a) pair production of same sign tops/antitops $\sigma (p\bar{p}\to tt+\bar{t}\bar{t})$ at TeVatron and (b) the partial top decay width for ${\Gamma }_{\mathcal{U}}(t\to u{\mathcal{U}}^V)$. We find that a large region of parameter space is consistent with the measurements of \tt production cross-section, \afbt and spin correlation coefficient at TeVatron and observe that the top decay width measurement constrains the flavor violating coupling of vector unparticles more severely than the same sign top/antitop production at TeVatron. We also predict the best point-set in the model parameter space for specific choices of \du corresponding to ${\chi }_{\min }^2$ evaluated using the \mttb spectrum of \afbt from the data set of Run II of TeVatron at the integrated luminosity 8.7 fb${}^{-1}$. Our results and analysis are consistent even with unparticle theories having broken scale invariance as long as the infrared cut-off scale is much less than the top pair production threshold.

37 pages, 24 figures, 1 new figure and some discussions added, references updated, to appear in Physical Review D

References in corpus (71)

• Herwig++ Physics and Manual
• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• Next-to-next-to-leading soft-gluon corrections for the top quark cross section and transverse momentum distribution
• Collider signals in unparticle physics
• Comments on Unparticles
• Top Quarks, Axigluons and Charge Asymmetries at Hadron Colliders
• Top quark and leptonic charge asymmetries for the Tevatron and LHC
• Threshold Resummation for the Top Quark Charge Asymmetry
• Collider Phenomenology of Unparticle Physics
• Deconstruction of Unparticles
• Constraining Unparticle Physics with Cosmology and Astrophysics
• Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
• Bounds on Unparticles Couplings to Electrons: from Electron g-2 to Positronium Decays
• Top quark asymmetry from a non-Abelian horizontal symmetry
• Axigluons cannot explain the observed top quark forward-backward asymmetry
• No like-sign tops at Tevatron: Constraints on extended models and implications for the t tbar asymmetry
• Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model
• Long-range Electron Spin-spin Interactions from Unparticle Exchange
• Unparticle physics and Higgs phenomenology
• Measurement of the top quark pair production cross section in the lepton+jets channel in proton-antiproton collisions at $\sqrt{s}$=1.96 TeV
• The top quark rapidity distribution and forward-backward asymmetry
• On measurement of top polarization as a probe of $t\bar{t}$ production mechanisms at the LHC
• A search for ttbar resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Unparticle constraints from SN1987A
• B \to K(K^*) missing energy in Unparticle physics
• Scalar modifications to gravity from unparticle effects may be testable
• Unparticles: Scales and High Energy Probes
• Colored Unparticles
• Lepton Flavour Violation in Unparticle Physics
• Forward-backward asymmetry of top quark in unparticle physics
• Unparticle Dark Matter
• Forward-backward asymmetry and differential cross section of top quark in flavor violating $Z^{\prime }$ model at $\mathcal{O}({\alpha }_s^2{\alpha }_X)$
• Measurement of ttbar Spin Correlation in ppbar Collisions Using the CDF II Detector at the Tevatron
• Top quark forward-backward asymmetry at Tevatron and its implications at the LHC
• A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at sqrt(s) = 7 TeV
• Chiral Couplings of W' and Top Quark Polarization at the LHC
• Long range forces and limits on unparticle interactions
• Contact Interactions and Resonance-Like Physics at Present and Future Colliders from Unparticles
• Measurement of spin correlation in ttbar production using dilepton final states
• Unparticles and Muon Decay
• Unparticle effects in Supernovae cooling
• New Color-Octet Vector Boson Revisit
• Astro Unparticle Physics
• Top quark forward-backward asymmetry from the $3-3-1$ model
• One-side Forward-backward Asymmetry in Top Quark Pair Production at CERN Large Hadron Collider
• Unparticle physics at the photon collider
• Measurement of the Top Pair Production Cross Section in the Dilepton Decay Channel in ppbar Collisions at sqrt s = 1.96 TeV
• Cosmological Constraints on Unparticles as Continuous Mass Scalars
• Un-particle Effective Action
• Cosmological Unparticle Correlators
• Probing R-parity Violating Interactions from Top Quark Polarization at LHC
• Probing the unparticle signal in $b\to d$ penguin processes
• Unparticle physics in top pair signals at the LHC and ILC
• The large CP phase in B(s) - anti-B(s) mixing and Unparticle Physics
• Unparticle Physics in Single Top Signals
• Effects of Unparticles on Running of Gauge Couplings
• Unparticle physics with broken scale invariance
• Charge asymmetries of top quarks: a window to new physics at hadron colliders
• Thermal Unparticles: A New Form of Energy Density in the Universe
• Top off the unparticle
• Unparticle actions and gauge invariance
• Some Issues in a Gauge Model of Unparticles
• Fermionic un-particles, gauge interactions and the $\beta$ function
• Neutrino, Photon Interaction in Unparticle Physics
• R-Parity Violating Supersymmetry Explanation for Large t tbar Forward-Backward Asymmetry
• Effect of top quark spin on the unparticle couplings in γγ\to t\bar{t}
• Reducing the parameter space for Unparticle-inspired models using white dwarf masses
• Aspects of Unparticle Physics
• Unparticle effects on top quark rare decays
• Unparticle Effects on Top Quark Pair Production at Photon Collider

Cited by in corpus (4)

• Top quark physics in the Vector Color-Octet Model
• Top Quark Asymmetries and Unparticle Physics
• Indian Contributions to LHC Theory
• Constraining unparticle physics from $CP$ violation in Cabibbo-favored decays of D mesons