https://doi.org/10.1140/epjc/s10052-015-3763-4
Regular Article - Theoretical Physics
Extra 
s and 
s in heterotic-string derived models
1
Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 7ZL, UK
2
Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK
* e-mail: alon.faraggi@liv.ac.uk
Received:
16
September
2015
Accepted:
25
October
2015
Published online:
17
November
2015
The ATLAS and CMS collaborations recently recorded possible excess in the di-boson production at the di-boson invariant mass at around 2 TeV. Such an excess may be produced if there exist additional and/or at that scale. We survey the extra s and s that may arise from semi-realistic heterotic-string vacua in the free fermionic formulation in the seven distinct cases: 
; family universal 
; non-universal 
; hidden sector U(1) symmetries and kinetic mixing; left–right symmetric models; Pati–Salam models; leptophobic and custodial symmetries. Each case has a distinct signature associated with the extra symmetry breaking scale. In one of the cases we explore the discovery potential at the LHC using resonant leptoproduction. The existence of an extra vector boson with the reported properties will significantly constrain the space of allowed string vacua.
© SIF and Springer-Verlag Berlin Heidelberg, 2015
