Probing the Tevatron t tbar asymmetry at LHC

Abstract

We use an effective operator framework to study the contributions to the Tevatron t tbar asymmetry from arbitrary vector bosons and scalars, and compare with their effect on the t tbar tail at LHC. Our study shows, for example, that models reproducing the t tbar asymmetry by exchange of Z' and W' bosons or colour-triplet scalars lead to a large enhancement in the t tbar tail at LHC. This fact can be used to exclude these models as the sole explanation for the asymmetry, using the data already collected by CMS and ATLAS. Our analysis is model independent in the sense that we scan over all possible extra particles contributing to the asymmetry, and allow for general couplings. We also explore a class of Standard Model extensions which can accommodate the Tevatron asymmetry without contributing to the total t tbar cross section at first order, so that the enhancement of the tail at Tevatron and LHC is moderate.

LaTeX 21 pages. Added several references and comments, and an appendix to study the validity of the effective operator approximation and efficiency issues

References in corpus (15)

• First measurement of the forward-backward charge asymmetry in top quark pair production
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• Single top quark production at LHC with anomalous Wtb couplings
• Effective four-fermion operators in top physics: a roadmap
• Constraining heavy colored resonances from top-antitop quark events
• Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
• Top quark asymmetry from a non-Abelian horizontal symmetry
• Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
• Axigluons cannot explain the observed top quark forward-backward asymmetry
• Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model
• Tevatron Asymmetry of Tops in a W',Z' Model
• Forward-backward asymmetry of top quark in unparticle physics
• Top quark forward-backward asymmetry at Tevatron and its implications at the LHC
• New Strongly Coupled Sector at the Tevatron and the LHC
• Effective operators in top physics

Cited by in corpus (17)

• Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Observable Effects of General New Scalar Particles
• Top quark asymmetry from a non-Abelian horizontal symmetry
• No like-sign tops at Tevatron: Constraints on extended models and implications for the t tbar asymmetry
• Asymmetries in top quark pair production at hadron colliders
• Measurement of the charge asymmetry in dileptonic decays of top quark pairs in $pp$ collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• Gluon excitations in t tbar production at hadron colliders
• Forward Tevatron Tops and Backward LHC Tops with Associates
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• Stealth QCD-like Strong Interactions and the t-tbar Asymmetry
• Quantum coherence, top transverse polarisation and the Tevatron asymmetry $A_{FB}^{\ell }$
• Portrait of a colour octet
• Predictions from Heavy New Physics Interpretation of the Top Forward-Backward Asymmetry
• Top Quark Charge Asymmetry: Searching for Light Axigluons in top pair + jet Production at the LHC
• Evidence for the charge asymmetry in $pp\to t\bar{t}$ production at $\sqrt{s}=13$ TeV with the ATLAS detector
• Top quark physics in the Large Hadron Collider era
• Top-quark Polarization and Asymmetries at the LHC in the Effective Description of Squark Interactions