Top quark forward-backward asymmetry from the 3-3-1 model
- Centro de Ciencias Naturais e Humanas, UFABC Santo Andre, SP (Brazil)
The forward-backward asymmetry A{sub 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}{sub tt} and invariant mass distribution M{sub 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){sub C} x SU(3){sub L} x U(1){sub X} model (3-3-1 model) that predicts the existence of a new neutral gauge boson, called Z{sup '}. 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{sub FB} for top quark pair production for two ranges of Z{sup '} mass while leading to a 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.
- OSTI ID:
- 21578182
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.054006; (c) 2011 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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PAIR PRODUCTION
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NUCLEON-ANTINUCLEON INTERACTIONS
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QUANTUM FIELD THEORY
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SPATIAL DISTRIBUTION
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