Top quark forward-backward asymmetry and same-sign top quark pairs
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' model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To...
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Published in | Physical review letters Vol. 106; no. 20; p. 201801 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
20.05.2011
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Online Access | Get more information |
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Summary: | 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' 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' 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⁻¹ of integrated luminosity, then a nonuniversal Z' alone cannot explain the Tevatron forward-backward asymmetry. |
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ISSN: | 1079-7114 |
DOI: | 10.1103/physrevlett.106.201801 |