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Tevatron top A_(FB) versus LHC top physics

Gresham, Moira I. and Kim, Ian-Woo and Zurek, Kathryn M. (2012) Tevatron top A_(FB) versus LHC top physics. Physical Review D, 85 (1). Art. No. 014022. ISSN 1550-7998. https://resolver.caltech.edu/CaltechAUTHORS:20190613-110922410

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Abstract

We carry out a comprehensive analysis of models for top A_(FB) at CDF in light of new top data arriving from the LHC. We begin with a careful Tevatron analysis, considering in general which sets of effective vertices give rise to a large forward-backward asymmetry while suppressing the contribution to the total tt̄ cross-section. We show on general grounds that scalar models struggle to produce sufficient asymmetries consistent with CDF observations, while vector models can produce a large asymmetry with a less significant tension in the total cross-section and tt̄ invariant mass distribution at the Tevatron. We examine the essential observables of these models for top physics at LHC7 with 1 fb^(−1) of data, including the total cross-section, invariant mass distribution and number of additional jets in tt̄ events. In the case of t-channel mediators, the LHC total cross-section places a strong constraint on light mediators, while the Tevatron invariant mass distributions place strong constraints on heavy mediators that are able to produce the asymmetry. In particular, single mediator production at the LHC can contribute significantly to tt̄ + jets events and lead to a significant increase in the tt̄ cross-section, as well as in the ratio of top pair events with extra jets to events with no extra jets. Heavy axigluons are becoming increasingly squeezed by LHC7 tt̄ and dijet resonance searches. We conclude that LHC7 top analyses are rapidly closing the window for viable models of the CDF top A_(FB).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevd.85.014022DOIArticle
https://arxiv.org/abs/1107.4364arXivDiscussion Paper
Alternate Title:Tevatron top AFB versus LHC top physics
Additional Information:© 2012 American Physical Society. (Received 11 August 2011; published 20 January 2012) We thank Sunghoon Jung, Daniel Whiteson, and Dirk Zerwas for discussions. K. M. Z. thanks the Aspen Center for Physics for hospitality while part of this work was being completed. The work of K. M. Z. was supported in part by NSF Contract No. 1049896.
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Funding AgencyGrant Number
NSFPHY-1049896
Issue or Number:1
Classification Code:PACS numbers: 14.65.Ha
Record Number:CaltechAUTHORS:20190613-110922410
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190613-110922410
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96385
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Jun 2019 14:59
Last Modified:03 Oct 2019 21:21

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