  We study single production and detection at the LHC run II of exotic partners
of the bottom quark. For masses larger than 1 TeV single production can
dominate over pair production that is suppressed due to phase space. The
presence of exotic partners of the bottom is motivated in models aiming to
solve the $A_{FB}^b$ anomaly measured at LEP and SLC. Minimal models of this
type with partial compositeness predict, as the lightest bottom partner, a new
fermion V of electric charge -4/3, also called mirror. The relevant coupling
for our study is a WVb vertex, which yields a signal that corresponds to a hard
W, a hard b-jet and a forward light jet. We design a search strategy for the
leptonic decay of the W, which avoids the large QCD multijet background and its
large uncertainties. We find that the main backgrounds are W+jets and ttbar,
and the key variables to enhance the signal over them are a hard b-jet and the
rapidity of the light jet. We determine the discovery reach for the LHC run II,
in particular we predict that, for couplings of order ~g/10, this signal could
be detected at a 95% confidence level with a mass up to 2.4 TeV using the first
100 fb-1.
