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Confronting top A_(FB) with parity violation constraints

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. 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
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevd.86.034029DOIArticle
https://arxiv.org/abs/1203.1320arXivDiscussion Paper
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-95ER40899
NSFPHY-1049896
Issue or Number:3
Classification Code:PACS numbers: 14.65.Ha, 11.30.Er, 24.80.+y
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:03 Oct 2019 21:21

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