Solutions to theRb,Rc, andαspuzzles by vector fermions

Chia-Hung V. Chang, Darwin Chang, Wai-Yee Keung
1996 Physical Review D, Particles and fields  
We propose two minimal extensions of Standard Model, both of which can easily accommodate the recent puzzling observations about the excess in R_b, the deficit in R_c and the discrepancy in the low energy and high energy determinations of α_s. Each model requires three additional heavy vectorial fermions in order to resolve the puzzles. The current phenomenological constraints and the new potential phenomena are also discussed.
doi:10.1103/physrevd.54.7051 pmid:10020713 fatcat:xip4regtzbhzpixwtpp3yfhvz4