# ICHEP2012

Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Dynamical Origin of the Correlation between the Top Quark Production Asymmetries $A_{FB}^t$ and $A_{FB}^{\ell}$

Not scheduled
17m
Melbourne Convention and Exhibition Centre

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 4 - Top Quark Physics

### Speaker

Dr Edmond Berger (Argonne National Laboratory (US))

### Description

A larger than expected forward-backward asymmetry in rapidity is observed in top quark pairs produced in proton-antiproton collisions at the Tevatron. The asymmetry is seen in both the top quark rapidity distribution $A_{FB}^t$ and in the distribution of charged leptons $A_{FB}^\ell$ from top quark decay. We explore the kinematic and dynamic aspects of the tight relationship of the two observables arising from the spin correlation between the charged lepton and the top quark with different polarization states. We also consider two benchmark new physics models, an axigluon model and a flavor-changing $W^\prime$ model. These models could explain the values of both $A_{FB}^t$ and $A_{FB}^\ell$. We emphasize the value of both measurements, and we conclude that a model which produces more right-handed than left-handed top quarks is favored by the present data. (The presentation would be based on the material in Phys Rev Lett. 108, 072002 (2012) [arXiv:1201.1790] and subsequent work.)

### Primary author

Dr Edmond Berger (Argonne National Laboratory (US))

### Presentation materials

There are no materials yet.