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A reappraisal of constraints on $Z'$ models from unitarity and direct searches at the LHC
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abstract
In a truly model-independent approach, we reexamine a minimal extension of the Standard Model (SM) through the introduction of an additional $U(1)$ symmetry leading to a new neutral gauge boson ($Z'$), allowing its kinetic mixing with the hypercharge gauge boson. An SM neutral scalar is used to spontaneously break this extra symmetry leading to the mass of the $Z'$. Except for three right-handed neutrinos no other fermions are added. We use the current LHC Drell-Yan data to put model-independent constraints in the parameter space of three quantities, namely, $M_{Z'}$, the $Z$-$Z'$ mixing angle ($\alpha_z$) and the extra $U(1)$ effective gauge coupling ($g'_x$), which absorb all model dependence. We impose additional constraints from unitarity and low energy neutrino-electron scattering. However, limits extracted from direct searches turn out to be most stringent. We obtain $M_{Z'} > 4.4$ TeV and $|\alpha_z| < 0.001$ at $95\%$ C.L., when the strength of the additional $U(1)$ gauge coupling is the same as that of the SM $SU(2)_L$.
Forward citations
Cited by 4 Pith papers
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Gauging the accidental symmetries of the Standard Model, and implications for the flavour anomalies
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False-vacuum collapse during first-order phase transitions can form PBHs and emit GWs across a broad parameter range, and MeV-scale classically conformal U(1)_{B-L} symmetry breaking has the largest region where both ...
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The $Z'$-boson of the $B-L$ Supersymmetric Standard Model and its Large Hadron Collider Searches
In the BLSSM, Z' masses down to 2.24 TeV remain allowed when the boson is fat, leptophobic, or has large branching ratios to model-specific states while respecting LEP/SLC and LHC constraints.
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Scalar dark matter, Neutrino mass and Leptogenesis in a $\rm U(1)_{B-L}$ model
A U(1)B-L model with four anomaly-cancelling fermions can satisfy dark matter relic density and direct detection bounds, neutrino oscillation data, and the observed baryon asymmetry through resonant leptogenesis.
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