Colored Scalars And The CDF $W+$dijet Excess. (arXiv:1105.2699v1 [hep-ph])

The recent data on $ W+$ dijet excess reported by CDF may be interpreted as the
associated production of a $ W$ and a new particle of mass about 150 GeV which
subsequently decays into two hadron jets. We study the possibility of
explaining the $ W+$ dijet excess by colored scalar bosons. There are several
colored scalars which can have tree level renormalizable Yukawa couplings with
two quarks, $ ({\bf 8}, {\bf 2}, 1/2)$ , $ (\bar{\bf 6}({\bf 3}), {\bf 3}({\bf
1}), -1/3)$ , $ (\bar {\bf 6}({\bf 3}), {\bf 1}, -4/3(2/3))$ . If one of these
scalars has a mass about 150 GeV, being colored it can naturally explain why
the excess only shows up in the form of two hadron jets. Although the required
production cross section and mass put constraints on model parameters and rule
out some possible scenarios when confronted with other existing data, in
particular FCNC data, we find that colored-octet doublet and colored-triplet
singlet scalars can be consistent with all data. We also study some features
for search of these new particles at the RHIC and the LHC and find that related
information can help further to distinguish different models.

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