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Volume 341 - The 20th International Workshop on Neutrinos (NuFACT2018) - Wg 5
A reappraisal of constraints on $Z^{\prime}$ models from unitarity and direct searches at the LHC
T. Bandyopadhyay,* G. Bhattacharyya, D. Das, A. Raychaudhuri
*corresponding author
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Pre-published on: 2019 October 15
Published on: 2019 December 12
We reexamine the ubiquitous $U(1)$ extension of the Standard Model (SM), with a new neutral gauge boson ($Z'$), in a truly model-independent approach. No new fermions, except for three right-handed neutrinos, are added. We use the current LHC Drell-Yan data to put model-independent constraints on the $Z'$ parameter space, defined by $M_{Z'}$, the $Z$-$Z'$ mixing angle ($\alpha_z$) and the extra $U(1)$ effective gauge coupling ($g'_x$), which absorb all model dependence. Additional constraints are imposed from unitarity and $\nu_\mu$-$e$ scattering. However, limits extracted from direct searches turn out to be the most stringent.

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