@misc{10481/30545,
year = {2011},
url = {http://hdl.handle.net/10481/30545},
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 u u -> t t. 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 t tbar 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 M_Z' ~ 150 GeV, which could also account for a recent CDF dijet excess in W+jet production, are barely allowed.},
organization = {This work has been partially supported by projects FPA2010-17915 (MICINN), FQM 101 and FQM 437 (Junta de Andalucía) and CERN/FP/116397/2010 (FCT).},
publisher = {Elsevier},
keywords = {Top quark},
keywords = {Standard model},
keywords = {Hadronic colliders},
title = {No like-sign tops at Tevatron: Constraints on extended models and implications for the tt asymmetry},
author = {Aguilar Saavedra, Juan Antonio and Pérez-Victoria, Manuel},
}