Abstract
I study the phenomenology of heavy neutral bosons $$Z'$$ , predicted in GUT-inspired U(1) $$'$$ models, at the Large Hadron Collider. In particular, I investigate possible signatures due to $$Z'$$ decays into supersymmetric particles, such as chargino, neutralino, and sneutrino pairs, leading to final states with charged leptons and missing energy. The analysis is carried out at $$\sqrt{s}=14$$ TeV, for a few representative points of the parameter space of the Minimal Supersymmetric Standard Model, suitably modified to accommodate the extra $$Z'$$ boson and consistent with the discovery of a Higgs-like boson with mass around 125 GeV. Results are presented for several observables and compared with those obtained for direct $$Z'$$ decays into lepton pairs, as well as direct production of supersymmetric particles. For the sake of comparison, $$Z'$$ phenomenology in an effective supersymmetric extension of the Sequential Standard Model is also discussed.
Highlights
Searching for heavy neutral gauge bosons Z is one of the challenging goals of the experiments performed at the Large Hadron Collider (LHC)
Z bosons are present in the so-called Sequential Standard Model (SSM), where the Z has the same couplings to fermions as the Standard Model (SM) Z boson
[17], wherein it was explained that any sequential Z must be accompanied by another Z and a longitudinal W. Employing this improved formulation of the SSM goes beyond the goals of this paper and I shall stick to the approximations in [7,8,9], with a ZS-SSM coupled to SM and Beyond the Standard Model (BSM) particles like the Standard Model Z
Summary
Searching for heavy neutral gauge bosons Z is one of the challenging goals of the experiments performed at the Large Hadron Collider (LHC). I shall extend the work in [8,9] giving some useful benchmarks for possible Z searches within supersymmetry It will be chosen a set of points in the parameter space yielding a SM-like Higgs boson with a mass around 125 GeV. In the Higgs sector, after electroweak symmetry breaking and giving mass to W , Z , and Z bosons, one is left with two charged H ± and four neutral Higgs bosons, namely one pseudoscalar A and three scalars h, H , and H , where H is due to the U(1) gauge group and is typically much heavier than the Z. A second contribution is due to possible extensions of the MSSM, such as the U(1) group, and is related to the Higgs bosons which break the new symmetry: g2 2. Employing this improved formulation of the SSM goes beyond the goals of this paper and I shall stick to the approximations in [7,8,9], with a ZS-SSM coupled to SM and BSM particles like the Standard Model Z
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