Single production of an exotic bottom partner at LHC

EZEQUIEL ALVAREZ; LEANDRO DA ROLD; JUAN IGNACIO SÁNCHEZ VIETTO

JOURNAL OF HIGH ENERGY PHYSICS

SPRINGER

Lugar: Berlin; Año: 2014 vol. 010 p. 2010 - 2037

1126-6708

We study single production and detection at the LHC run II of exotic partnersof the bottom quark. For masses larger than 1 TeV single production can dominate overpair production that is suppressed due to phase space. The presence of exotic partners ofthe bottom is motivated in models aiming to solve the Ab B anomaly measured at LEPFand SLC. Minimal models of this type with partial compositeness predict, as the lightestbottom partner, a new fermion V of electric charge −4/3, also called mirror. The relevantcoupling for our study is a W V b vertex, which yields a signal that corresponds to a hardW , a hard b-jet and a forward light jet. We design a search strategy for the leptonic decayof the W , which avoids the large QCD multijet background and its large uncertainties. ̄We find that the main backgrounds are W +jets and tt, and the key variables to enhancethe signal over them are a hard b-jet and the rapidity of the light jet. We determine thediscovery 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 TeVusing the first 100 fb−1 .