Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs

Journal Article · Fri May 20 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.201801· OSTI ID:21538344

Berger, Edmond L ^[1]; Qinghong, Cao ^[1]; Chen, Chuan-Ren ^[2]; Chongsheng, Li; Hao, Zhang ^[3]

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1. High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Institute for Physics and Mathematics of the Universe, University of Tokyo, Chiba 277-8568 (Japan)
3. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z{sup '} model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the Z{sup '} to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for tt and ttj production in early LHC experiments at 7-8 TeV and conclude that if no tt signal is observed with 1 fb{sup -1} of integrated luminosity, then a nonuniversal Z{sup '} alone cannot explain the Tevatron forward-backward asymmetry.

• OSTI ID: 21538344
• Journal Information: Physical Review Letters, Vol. 106, Issue 20; Other Information: DOI: 10.1103/PhysRevLett.106.201801; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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