Forward-backward asymmetry of top quark production at the Tevatron in warped extra dimensional models

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.071702· OSTI ID:21421334

Djouadi, Abdelhak; Moreau, Gregory ^[1]; Richard, Francois ^[2]; Singh, Ritesh K ^[3]

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1. Laboratoire de Physique Theorique, Universite Paris XI, F-91405 Orsay Cedex (France)
2. Laboratoire de l'Accelerateur Lineaire, Universite de Paris-Sud, F-91898 Orsay Cedex (France)
3. Lehrstuhl fuer Theoretische Physik II, Universitaet Wuerzburg, D-97074 Wuerzburg (Germany)

The CDF and D0 experiments have reported on the measurement of the forward-backward asymmetry of top quark pair production at the Tevatron and the result is that it is more than 2 standard deviations above the predicted value in the standard model. This has to be added to the long-standing anomaly in the forward-backward asymmetry for bottom quark production at LEP which is 3 standard deviations different from the standard model value. The discrepancy in the bottom asymmetry can be accounted for by the contributions of Kaluza-Klein excitations of electroweak gauge bosons at LEP in warped extra-dimensional models in which the fermions are localized differently along the extra dimension so that the gauge interactions of heavy third generation fermions are naturally different from that of light fermions. In this paper, we show that it is more difficult to elaborate a model generating a significant top asymmetry through exchanges of Kaluza-Klein gluons at the Tevatron due to the indirect constraints originating from precision electroweak data.

• OSTI ID: 21421334
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 7; Other Information: DOI: 10.1103/PhysRevD.82.071702; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B QUARKS
EXCITATION
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
GLUONS
KALUZA-KLEIN THEORY
LEP STORAGE RINGS
PAIR PRODUCTION
STANDARD MODEL
T QUARKS
WEINBERG-SALAM GAUGE MODEL
ACCELERATORS
BEAUTY PARTICLES
BOSONS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
INTERACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
QUANTUM FIELD THEORY
QUARKS
RADIATION DETECTORS
STORAGE RINGS
SYNCHROTRONS
TOP PARTICLES
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES