Gresham, Moira I. and Kim, Ian-Woo and Tulin, Sean and Zurek, Kathryn M. (2012) Confronting top A_(FB) with parity violation constraints. Physical Review D, 86 (3). Art. No. 034029. ISSN 1550-7998. doi:10.1103/physrevd.86.034029. https://resolver.caltech.edu/CaltechAUTHORS:20190613-164147797
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Abstract
We consider the implications of low-energy precision tests of parity violation on t-channel mediator models explaining the top A_(FB) excess measured by the CDF and D0 Collaborations. Flavor-violating u−t or d−t couplings of new scalar or vector mediators generate at one-loop an anomalous contribution to the nuclear weak charge. As a result, atomic parity violation constraints disfavor at ≳ 3σ t-channel models that give rise to a greater than 20% A_(FB) at the parton level for M_(tt̄) > 450 GeV while not producing too large a tt̄ cross section. Even stronger constraints are expected through future measurements of the proton weak charge by the Qweak experiment.
| Item Type: | Article | |||||||||
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| Alternate Title: | Confronting top AFB with parity violation constraints | |||||||||
| Additional Information: | © 2012 American Physical Society. (Received 18 March 2012; published 29 August 2012) We thank Y. Hochberg, A. Pierce, and H. B. Yu for helpful discussions. S. T. was supported by DOE Grant No. DE-FG02-95ER40899 and K. Z. was supported by NSF CAREER Grant No. PHY1049896. | |||||||||
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| Issue or Number: | 3 | |||||||||
| Classification Code: | PACS numbers: 14.65.Ha, 11.30.Er, 24.80.+y | |||||||||
| DOI: | 10.1103/physrevd.86.034029 | |||||||||
| Record Number: | CaltechAUTHORS:20190613-164147797 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190613-164147797 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 96400 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 17 Jun 2019 14:40 | |||||||||
| Last Modified: | 16 Nov 2021 17:20 |
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