Leptophobic Z in Supersymmetry
and Where to Find Them
Jack Y. Araz
Abstract This report presents possible loopholes in heavy Z searches which are
concentrated around high-mass resonances. We present a scenario where massive
neutral vector boson Z , predicted by E 6 -inspired U(1) models, can become
leptophobic due to kinetic mixing between Z − Z . Such a scenario can avoid
high-mass dilepton resonance searches. Furthermore, we propose a channel through
supersymmetric cascade decays to observe leptophobic Z . We show that it is
possible to reach up to 8σ at
√
s = 14 TeV and 3 ab −1 integrated luminosity. This
report follows the steps of the work that has been conducted in Araz et al. (J High
Energy Phys 02:092, 2018).
Keywords Supersymmetry · Z
1 Introduction
Heavy neutral gauge boson, Z , can be obtained by extending the Standard
Model (SM) gauge structure with a U(1) gauge group. Such models have been
widely studied under Grand Unified Scheme [1]. Similarly, under supersymmetric
realisations, Z can emerge from U(1) extended minimal supersymmetric extension
of the SM (UMSSM). It can also be achieved in the so-called Sequential Standard
Model (SSM) where Z , and W , bosons have same couplings to fermions as their
SM counterparts.
Search for heavy neutral vector bosons in LHC has been extensively studied by
experimental collaborations due to its relatively familiar resonance signature [2–7].
These searches set the mass bound for the Z assuming that it can only decay through
the SM particles. These studies focus on high-mass dilepton or dijet resonances.
In case of the dijet resonance studies at
√
s = 13 TeV, ATLAS collaboration [5]
presented the Z mass bounds around 2.1–2.9 TeV for 37 fb −1 integrated luminosity
J. Y. Araz ()
Concordia University, Montréal, QC, Canada
e-mail: jack.araz@concordia.ca
© Springer Nature Switzerland AG 2021
M. B. Paranjape et al. (eds.), Quantum Theory and Symmetries, CRM Series in
Mathematical Physics, https://doi.org/10.1007/978-3-030-55777-5_52
559
and Where to Find Them
Jack Y. Araz
Abstract This report presents possible loopholes in heavy Z searches which are
concentrated around high-mass resonances. We present a scenario where massive
neutral vector boson Z , predicted by E 6 -inspired U(1) models, can become
leptophobic due to kinetic mixing between Z − Z . Such a scenario can avoid
high-mass dilepton resonance searches. Furthermore, we propose a channel through
supersymmetric cascade decays to observe leptophobic Z . We show that it is
possible to reach up to 8σ at
√
s = 14 TeV and 3 ab −1 integrated luminosity. This
report follows the steps of the work that has been conducted in Araz et al. (J High
Energy Phys 02:092, 2018).
Keywords Supersymmetry · Z
1 Introduction
Heavy neutral gauge boson, Z , can be obtained by extending the Standard
Model (SM) gauge structure with a U(1) gauge group. Such models have been
widely studied under Grand Unified Scheme [1]. Similarly, under supersymmetric
realisations, Z can emerge from U(1) extended minimal supersymmetric extension
of the SM (UMSSM). It can also be achieved in the so-called Sequential Standard
Model (SSM) where Z , and W , bosons have same couplings to fermions as their
SM counterparts.
Search for heavy neutral vector bosons in LHC has been extensively studied by
experimental collaborations due to its relatively familiar resonance signature [2–7].
These searches set the mass bound for the Z assuming that it can only decay through
the SM particles. These studies focus on high-mass dilepton or dijet resonances.
In case of the dijet resonance studies at
√
s = 13 TeV, ATLAS collaboration [5]
presented the Z mass bounds around 2.1–2.9 TeV for 37 fb −1 integrated luminosity
J. Y. Araz ()
Concordia University, Montréal, QC, Canada
e-mail: jack.araz@concordia.ca
© Springer Nature Switzerland AG 2021
M. B. Paranjape et al. (eds.), Quantum Theory and Symmetries, CRM Series in
Mathematical Physics, https://doi.org/10.1007/978-3-030-55777-5_52
559