2010/11/23 by J. Montaño, J. Montano, M. Napsuciale +2
Physics and Astronomy · #Branching fraction #Context (archaeology) #Crystallography #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.84.115010
8 pages, 7 figures
arxiv created 2010/11/23 · openalex publication_date 2011/12/09 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the Z^\ensuremath'\ensuremath→qq,ggg decays in the context of a manifest left-right symmetric gauge theory with three and four generations. The Z^\ensuremath' couplings to quarks are fixed essentially by the parameters of the standard model and we obtain \ensuremathΓ(Z^\ensuremath'\ensuremath→qq)\ensuremath≈14 GeV for M_Z^\ensuremath'\ensuremath≈1 TeV. For the Z^\ensuremath'\ensuremath→ggg decay and three families we obtain a branching ratio BR(Z^\ensuremath'\ensuremath→ggg)=\frac\ensuremathΓ(Z^\ensuremath'\ensuremath→ggg)\ensuremathΓ(Z^\ensuremath'\ensuremath→qq)=1.2\ensuremath-2.8\ifmmode×\else\texttimes\fi10^\ensuremath-5 for m_Z^\ensuremath'=700--1500 GeV. The fourth generation produces an enhancement in the branching ratio for Z^\ensuremath' masses close to the b^\ensuremath'b^\ensuremath' threshold and a dip for Z^\ensuremath' masses close to the t^\ensuremath't^\ensuremath' threshold. Using the values of the fourth-generation quark masses allowed by electroweak precision data, we obtain a branching ratio BR(Z^\ensuremath'\ensuremath→ggg)=(1\ensuremath-6)\ifmmode×\else\texttimes\fi10^\ensuremath-5 for m_Z^\ensuremath'=(700--1500) GeV.