566
J. Y. Araz
continually compared UMSSM with USM to emphasise the difference that inclusion
of supersymmetric particles can create.
Furthermore, we examined the possibility of having a leptophobic Z by adding
kinetic mixing between Z − Z to avoid high-mass leptonic resonance searches. We
showed that the bounds from dijet resonances are considerably small and allow a
light Z up to 1.6 TeV. To back up such claim, we proposed a supersymmetry driven
channel to observe such leptophobic Z . We showed that it is possible to reach 8σ
sensitivity at 14 TeV centre-of-mass energy with 3 ab −1 integrated luminosity using
chargino production through Z where charginos further decayed into two leptons
and missing energy.
Assuming all cut efficiencies and kinematic structures will be preserved, we
extrapolated our results to higher energies and luminosities. We showed the
observable mass range for Z up to 5σ sensitivity for 27 TeV centre-of-mass energy.
All results are compared with different systematic uncertainties on the background
and different luminosity values to address the importance of understanding the
background as well as the signal itself. These results show that investigating such
scenarios is both feasible and worthwhile at HL- & HE-LHC.
References
1. P. Langacker, The physics of heavy Z
gauge bosons. Rev. Mod. Phys. 81, 1199–1228 (2009).
http://dx.doi.org/10.1103/RevModPhys.81.1199
2. ATLAS Collaboration, M. Aaboud et al., Search for new high-mass phenomena in the dilepton
final state using 36.1 fb −1 of proton-proton collision data at
√
s = 13 TeV with the ATLAS
detector (2017). http://arxiv.org/abs/1707.02424
3. CMS Collaboration, A.M. Sirunyan et al., Search for dijet resonances in proton–proton
collisions at
√
s = 13 TeV and constraints on dark matter and other models. Phys. Lett.
B769, 520–542 (2017). http://dx.doi.org/10.1016/j.physletb.2017.02.012, http://arxiv.org/abs/
1611.03568
4. CMS Collaboration, Search for a high-mass resonance decaying into a dilepton final state in
13 fb −1 of pp collisions at
√
s = 13 TeV. Tech. Rep. CMS-PAS-EXO-16-031, CERN, Geneva
(2016)
5. ATLAS Collaboration, M.E.A. Aaboud, Search for new phenomena in dijet events using 37
fb −1 of pp collision data collected at
√
s = 13 TeV with the ATLAS detector. Phys. Rev. D
96, 052004 (2017). http://dx.doi.org/10.1103/PhysRevD.96.052004
6. CMS Collaboration, A search for dijet resonances in proton-proton collisions at
√
s = 13 TeV
with a new background prediction method. Tech. Rep. CMS-PAS-EXO-19-012, CERN,
Geneva (2019)
7. ATLAS Collaboration, G. Aad et al., Search for high-mass dilepton resonances using 139 fb −1
of pp collision data collected at
√
s =13 TeV with the ATLAS detector. Phys. Lett. B796, 68–
87 (2019). http://dx.doi.org/10.1016/j.physletb.2019.07.016, http://arxiv.org/abs/1903.06248
8. R. Slansky, Group theory for unified model building. Phys. Rep. 79, 1–128 (1981). http://dx.
doi.org/https://doi.org/10.1016/0370-1573(81)90092-2
9. R.H. Benavides, L. Muoñz, W.A. Ponce, O. Rodríguez, E. Rojas, Electroweak couplings and
LHC constraints on alternative Z models in E 6 . Int. J. Mod. Phys. A33, 1850206 (2018).
http://dx.doi.org/10.1142/S0217751X18502068. http://arxiv.org/abs/1801.10595
10. J.Y. Araz, M. Frank, B. Fuks, Differentiating U(1) supersymmetric models with right
sneutrino and neutralino dark matter. Phys. Rev. D96, 015017 (2017). http://dx.doi.org/10.
1103/PhysRevD.96.015017, http://arxiv.org/abs/1705.01063
J. Y. Araz
continually compared UMSSM with USM to emphasise the difference that inclusion
of supersymmetric particles can create.
Furthermore, we examined the possibility of having a leptophobic Z by adding
kinetic mixing between Z − Z to avoid high-mass leptonic resonance searches. We
showed that the bounds from dijet resonances are considerably small and allow a
light Z up to 1.6 TeV. To back up such claim, we proposed a supersymmetry driven
channel to observe such leptophobic Z . We showed that it is possible to reach 8σ
sensitivity at 14 TeV centre-of-mass energy with 3 ab −1 integrated luminosity using
chargino production through Z where charginos further decayed into two leptons
and missing energy.
Assuming all cut efficiencies and kinematic structures will be preserved, we
extrapolated our results to higher energies and luminosities. We showed the
observable mass range for Z up to 5σ sensitivity for 27 TeV centre-of-mass energy.
All results are compared with different systematic uncertainties on the background
and different luminosity values to address the importance of understanding the
background as well as the signal itself. These results show that investigating such
scenarios is both feasible and worthwhile at HL- & HE-LHC.
References
1. P. Langacker, The physics of heavy Z
gauge bosons. Rev. Mod. Phys. 81, 1199–1228 (2009).
http://dx.doi.org/10.1103/RevModPhys.81.1199
2. ATLAS Collaboration, M. Aaboud et al., Search for new high-mass phenomena in the dilepton
final state using 36.1 fb −1 of proton-proton collision data at
√
s = 13 TeV with the ATLAS
detector (2017). http://arxiv.org/abs/1707.02424
3. CMS Collaboration, A.M. Sirunyan et al., Search for dijet resonances in proton–proton
collisions at
√
s = 13 TeV and constraints on dark matter and other models. Phys. Lett.
B769, 520–542 (2017). http://dx.doi.org/10.1016/j.physletb.2017.02.012, http://arxiv.org/abs/
1611.03568
4. CMS Collaboration, Search for a high-mass resonance decaying into a dilepton final state in
13 fb −1 of pp collisions at
√
s = 13 TeV. Tech. Rep. CMS-PAS-EXO-16-031, CERN, Geneva
(2016)
5. ATLAS Collaboration, M.E.A. Aaboud, Search for new phenomena in dijet events using 37
fb −1 of pp collision data collected at
√
s = 13 TeV with the ATLAS detector. Phys. Rev. D
96, 052004 (2017). http://dx.doi.org/10.1103/PhysRevD.96.052004
6. CMS Collaboration, A search for dijet resonances in proton-proton collisions at
√
s = 13 TeV
with a new background prediction method. Tech. Rep. CMS-PAS-EXO-19-012, CERN,
Geneva (2019)
7. ATLAS Collaboration, G. Aad et al., Search for high-mass dilepton resonances using 139 fb −1
of pp collision data collected at
√
s =13 TeV with the ATLAS detector. Phys. Lett. B796, 68–
87 (2019). http://dx.doi.org/10.1016/j.physletb.2019.07.016, http://arxiv.org/abs/1903.06248
8. R. Slansky, Group theory for unified model building. Phys. Rep. 79, 1–128 (1981). http://dx.
doi.org/https://doi.org/10.1016/0370-1573(81)90092-2
9. R.H. Benavides, L. Muoñz, W.A. Ponce, O. Rodríguez, E. Rojas, Electroweak couplings and
LHC constraints on alternative Z models in E 6 . Int. J. Mod. Phys. A33, 1850206 (2018).
http://dx.doi.org/10.1142/S0217751X18502068. http://arxiv.org/abs/1801.10595
10. J.Y. Araz, M. Frank, B. Fuks, Differentiating U(1) supersymmetric models with right
sneutrino and neutralino dark matter. Phys. Rev. D96, 015017 (2017). http://dx.doi.org/10.
1103/PhysRevD.96.015017, http://arxiv.org/abs/1705.01063