No like-sign tops at Tevatron: Constraints on extended models and implications for the tt asymmetry

61Citations
Citations of this article
5Readers
Mendeley users who have this article in their library.
Get full text

Abstract

We use a recent upper limit from CDF on like-sign top pair production to place constraints on general new vector bosons and scalars mediating uu→tt. The possible vector bosons comprise neutral colour singlets or octets, and charge 4/3 colour triplets or sextets, whereas the new scalars can be neutral colour singlets or octets and charge 4/3 colour sextets. We also estimate the expected bounds from like-sign top pair production at LHC in the near future. Then, we address the implications of these limits for the forward-backward asymmetry in tt production measured at Tevatron. In particular, we find that models explaining the observed asymmetry by the exchange of a single t-channel heavy Z→ boson are already excluded. On the other hand, light Z→ bosons with a mass MZ≃150GeV, which could also account for a recent CDF dijet excess in W+jet production, are barely allowed. © 2011 Elsevier B.V.

Cite

CITATION STYLE

APA

Aguilar-Saavedra, J. A., & Pérez-Victoria, M. (2011). No like-sign tops at Tevatron: Constraints on extended models and implications for the tt asymmetry. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 701(1), 93–100. https://doi.org/10.1016/j.physletb.2011.05.037

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free