AtFB meets LHC
The recent Tevatron measurement of the forward-backward asymmetry of the top quark shows an intriguing discrepancy with Standard Model expectations, particularly at large t¯t invariant masses. Measurements of this quantity are subtle at the LHC, due to its pp initial state, however, one can define a...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
7 September 2011
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| In: |
Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2011, Volume: 84, Issue: 5, Pages: 1-10 |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.84.054005 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.84.054005 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.84.054005 
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| Author Notes: | JoAnne L. Hewett, Jessie Shelton, Michael Spannowsky, Tim M. P. Tait, and Michihisa Takeuchi |
| Summary: | The recent Tevatron measurement of the forward-backward asymmetry of the top quark shows an intriguing discrepancy with Standard Model expectations, particularly at large t¯t invariant masses. Measurements of this quantity are subtle at the LHC, due to its pp initial state, however, one can define a forward-central-charge asymmetry which captures the physics. We study the capability of the LHC to measure this asymmetry and find that within the SM a measurement at the 5σ level is possible with roughly 60 fb−1 at √s=14 TeV. If nature realizes a model which enhances the asymmetry (as is necessary to explain the Tevatron measurements), a significant difference from zero can be observed much earlier, perhaps even during early LHC running at √s=7 TeV. We further explore the capabilities of the 7 TeV LHC to discover resonances or contact interactions which modify the t¯t invariant mass distribution using recent boosted top-tagging techniques. We find that TeV-scale color-octet resonances can be discovered, even with small coupling strengths and that contact interactions can be probed at scales exceeding 6 TeV. Overall, the LHC has good potential to clarify the situation with regards to the Tevatron forward-backward measurement. |
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| Item Description: | Gesehen am 21.09.2022 Das t in AtFB ist hochgestellt, FB ist tiefgestellt |
| Physical Description: | Online Resource |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.84.054005 |