Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-07
Phys.Rev.D83:054006,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 4 figures, 2 tables
Scientific paper
10.1103/PhysRevD.83.054006
The forward-backward asymmetry $A_{FB}$ in top quark pair production, measured at the Tevatron, is probably related to the contribution of new particles. The Tevatron result is more than a $2\sigma$ deviation from the standard model prediction and motivates the application of alternative models introducing new states. However, as the standard model predictions for the total cross section $\sigma_{tt}$ and invariant mass distribution $M_{tt}$ for this process are in good agreement with experiments, any alternative model must reproduce these predictions. These models can be placed into two categories: One introduces the s-channel exchange of new vector bosons with chiral couplings to the light quarks and to the top quark and another relies on the t-channel exchange of particles with large flavor-violating couplings in the quark sector. In this work we employ a model which introduces both s- and t-channel nonstandard contributions for the top quark pair production in proton antiproton collisions. We use the minimal version of the $SU(3)_C \otimes SU(3)_L \otimes U (1)_X$ model (3-3-1 model) that predicts the existence of a new neutral gauge boson, called $Z^\prime$. This gauge boson has both flavor-changing couplings to up and top quarks and chiral coupling to the light quarks and to the top quark. This very peculiar model coupling can correct the $A_{FB}$ for top quark pair production for two ranges of $Z^\prime$ mass while leading to cross section and invariant mass distribution quite similar to the standard model ones. This result reinforces the role of the 3-3-1 model for any new physics effect.
Barreto Ramirez E.
Borges J. Sá
Coutinho Y. A.
No associations
LandOfFree
Top quark forward-backward asymmetry from the $3-3-1$ model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Top quark forward-backward asymmetry from the $3-3-1$ model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Top quark forward-backward asymmetry from the $3-3-1$ model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-607041