Loopholes in Z′ searches at the LHC: exploring supersymmetric and leptophobic scenarios

Araz, Jack Y.; Corcella, Gennaro; Frank, Mariana; Fuks, Benjamin

doi:10.1007/jhep02(2018)092

“…The severest bound on M Z comes from negative results from the LEP data as M Z /g B−L ≥ 6 TeV [65]. Even though considering its decay modes can lower the mass bound on Z [14][15][16][17], setting M Z ≥ 4 TeV [18] guarantees avoiding possible exclusions on our solutions due to the light Z mass. Thus we restrict its range in our scan as…”

Section: Jhep01(2021)161mentioning

confidence: 99%

“…There appears a Z gauge boson together with its SUSY fermion partnerB . The search for Z such as this is a major focus of the recent and planned experiments [14][15][16][17][18]. Our investigation is based on the model proposed in ref.…”

Section: Introductionmentioning

confidence: 99%

Sparticle spectroscopy and dark matter in a U(1)B−L extension of MSSM

Ahmed

¹

,

Raza

²

,

Shafi

³

et al. 2021

J. High Energ. Phys.

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We consider a class of SUSY models in which the MSSM gauge group is supplemented with a gauged U(1)B−L symmetry and a global U(1)R symmetry. This extension introduces only electrically neutral states, and the new SUSY partners effectively double the number of states in the neutralino sector that now includes a blino (from B − L) and singlino from a gauge singlet superfield. If the DM density is saturated by a LSP neutralino, the model yields quite a rich phenomenology depending on the DM composition. The LSP relic density constraint provides a lower bound on the stop and gluino masses of about 3 TeV and 4 TeV respectively, which is testable in the near future collider experiments such as HL-LHC. The chargino mass lies between 0.24 TeV and about 2.0 TeV, which can be tested based on the allowed decay channels. We also find $$ {m}_{\tilde{\tau}1}\gtrsim $$ m τ ˜ 1 ≳ 500 GeV, and $$ {m}_{\tilde{e}},{m}_{\tilde{\mu}},{m}_{{\tilde{v}}^{S,P}}\gtrsim $$ m e ˜ , m μ ˜ , m v ˜ S , P ≳ 1 TeV. We identify chargino-neutralino coannihilation processes in the mass region 0.24 TeV $$ \lesssim {m}_{{\tilde{\upchi}}_1^0}\approx {m}_{{\tilde{\upchi}}_1^{\pm }}\lesssim $$ ≲ m χ ˜ 1 0 ≈ m χ ˜ 1 ± ≲ 1.5 TeV, and also coannihilation processes involving stau, selectron, smuon and sneutrinos for masses around 1 TeV. In addition, A2 resonance solutions are found around 1 TeV, and H2 and H3 resonance solutions are also shown around 0.5 TeV and 1 TeV . Some of the A2 resonance solutions with tan β ≳ 20 may be tested by the A/H → τ+τ− LHC searches.. While the relic density constraint excludes the bino-like DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales. We show that all these solutions will be tested in future direct detection experiments such as LUX-Zeplin and Xenon-nT.

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“…In addition, the current mass bounds on Z 0 are established as M Z 0 ≳ 4.1 TeV [18]. On the other hand, this bound can vary model dependently, and a most recent study [47] has shown that M Z 0 ≳ 2.5 TeV can survive, if Z 0 is leptophobic. Based on our previous study [19], which was conducted in the similar parameter space, the leptonic decay processes of Z 0 are found as BRðZ 0 → llÞ ≲ 14%.…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 99%

Charged Higgs boson in MSSM and beyond

Hiçyılmaz

¹

,

Selbuz

²

,

Solmaz

³

et al. 2018

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We conduct a numerical study over the constrained MSSM (CMSSM), next-to-MSSM (NMSSM) and Uð1Þ extended MSSM (UMSSM) to probe the allowed mass ranges of the charged Higgs boson and its dominant decay patterns, which might come into prominence in the near future collider experiments. We present results obtained from a limited scan for CMSSM as a basis and compare its predictions with the extended models. We observe within our data that a wide mass range is allowed as 0.5ð1Þ ≲ m H AE ≲ 17 TeV in UMSSM (NMSSM). We find that the dominant decay channel is mostly H AE → tb such that BRðH AE → tbÞ ∼ 80%. While this mode remains dominant over the whole allowed parameter space of CMSSM, we realize some special domains in the NMSSM and UMSSM, in which BRðH AE → tbÞ ≲ 10%. In this context, the decay patterns of the charged Higgs can play a significant role to distinguish among the SUSY models. In addition to the tb decay mode, we find that the narrow mass scale in CMSSM allows only the decay modes for the charged Higgs boson to τν (∼16%), and their supersymmetric partnersτν (∼13%).On the other hand, it is possible to realize the mode in NMSSM and UMSSM in which the charged Higgs boson decays into a chargino and neutralino pair up to about 25%. This decay mode requires nonuniversal boundary conditions within the MSSM framework to be available, since CMSSM yields BRðH AE →χ 0 1χ AE 1 Þ ≲ 1%. It can also be probed in the near future collider experiments through the missing energy and CP-violation measurements. Moreover, the chargino mass is realized as m˜χAE 1 ≳ 1 TeV in NMSSM and UMSSM, and these solutions will be likely tested soon in collider experiments through the chargino-neutralino production. Focusing on the chargino-neutralino decay patterns, we also present tables which list the possible ranges for the charged Higgs production and decay modes.

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“…These models can be rendered leptophobic by using kinetic mixing between the two U (1) gauge groups, as in e.g. [37].…”

Section: Introductionmentioning

confidence: 99%

Dark matter and collider signals in supersymmetric U(1)′ models with nonuniversal Z′ couplings

Frank

¹

,

Huitu

²

,

Mondal

³

2019

Self Cite

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We analyse supersymmetric models augmented by an extra U (1) gauge group. To avoid anomalies in these models without introducing exotics, we allow for family-dependent U (1) charges, and choose a simple form for these, dependent on one U (1) charge parameter only. With this choice, Z decays into di-taus but not di-leptons, weakening considerably the constraints on its mass. In the supersymmetric sector, the effect is to lower the singlino mass, allowing it to be the dark matter candidate. We investigate the dark matter constraints and collider implications of such models, with mostly singlino, or mostly higgsinos, or a mixture of the two as lightest supersymmetric particles. In these scenarios, Z decays significantly into chargino or neutralino pairs, and thus indirectly into final state leptons. We devise benchmarks which, with adequate cuts, can yield signals visible at the high-luminosity LHC.

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Loopholes in Z′ searches at the LHC: exploring supersymmetric and leptophobic scenarios

Cited by 26 publications

References 69 publications

Sparticle spectroscopy and dark matter in a U(1)B−L extension of MSSM

Sparticle spectroscopy and dark matter in a U(1)B−L extension of MSSM

Charged Higgs boson in MSSM and beyond

Dark matter and collider signals in supersymmetric U(1)′ models with nonuniversal Z′ couplings

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