Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-03-24
Phys.Rev.D48:969-973,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
(figures available on request), 12 pages, UPR-547-T
Scientific paper
10.1103/PhysRevD.48.R969
We point out that at future hadron colliders the ratio of cross sections for $pp\to Z'\to \ell^+\ell^-$ in two rapidity bins is a useful probe of the relative couplings of the $Z'$ to $u$ and $d$ quarks. Combined with the forward-backward asymmetry, the rare decay modes $Z'\to W \ell\nu_\ell$, and three associated productions $pp\to Z'V$ ($V=Z,W,\gamma$), and assuming inter-family universality, small $Z-Z'$ mixing, and the $Z'$ charge commuting with the $SU_{2L}$ generators, three out of four normalized couplings could be extracted. An analysis of the statistical uncertainties expected for the above probes at the LHC for typical models with $M_{Z'}\simeq1$ TeV shows that one lepton coupling and two combinations of quark couplings could be determined to around 5\%, 20\%, and 30\%, respectively. This allows for a clear distinction between models.
Aguila Del F.
Cvetic Mirjam
Langacker Paul
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