Light stops and fine-tuning in MSSM

Cici, Ali; Kırca, Zerrin; Ün, Cem Salih

doi:10.1140/epjc/s10052-018-5549-y

Cited by 5 publications

(7 citation statements)

References 68 publications

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“…1 , and at 50% CL for t → b χ± 1 [7]. For m t 500 GeV the exclusion is realized at the order of a few percent, even though the current results exclude a stop mass below about 800 GeV, if these decay modes are allowed in the low scale analyses.…”

Section: Introductioncontrasting

confidence: 57%

“…The relevant background processes can be listed as t t, single top, t tW , t tZ, t tt t, t th, W W , W Z, ZZ and W/Z + jets [9]. Even though the top quark pair production dominates in the background processes, the signal is expected to have much more missing energy, and the events from the top pair production background can be suppressed by applying a cut on the missing energy as / E T 300 GeV [7]. In this case, production of two pairs top quarks can be considered the main background in its final state.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gluino Search with Stop and Top in Nonuniversal Gaugino Mass Models at LHC and Future Colliders

Altin,

Cici,

Kirca

et al. 2019

Preprint

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We discuss the gluino mass in the CMSSM and Nonuniversal Gaugino Mass Models (NUGM) frameworks in light of the results from the current LHC and Dark Matter experiments. Assuming negative results from the current and near future LHC experiments, we probe the gluino mass scales by considering its decay modes into stop and top quarks, g → t1 t and g → tt χ01 , where t1 t represents both t1 t and t * 1 t. The region with m g 2 TeV is excluded up to 68% CL in the CMSSM if the gluino decays into a stop and top quark, while the 95% CL exclusion requires m g 1.9 TeV. Considering an error of about 10% in calculations of the SUSY mass spectrum, such exclusion bounds on the gluino mass more or less overlap with the current LHC results. The decay mode g → tt χ01 may take over if g → t1 t is not allowed. One can probe the gluino mass in this case up to about 1.5 TeV with 68% CL in the CMSSM, and about 1.4 TeV with 95% CL. Imposing the Dark Matter constraints yields a lower bound on the gluino and stop masses of about 3.2 TeV from below, which is beyond the reach of the current LHC experiments. A similar analyses in the NUGM framework yield exclusion curves for the gluino mass m g 2.1 TeV at 14 TeV for both decay modes of the gluino under consideration. We also show that increasing the center of mass energy to 27 TeV can probe the gluino mass up to about 3 TeV through its decay mode into stop and top quark. The Dark Matter constraints are not very severe in the framework of NUGM, and they allow solutions with m g, m t 1 TeV. In addition, with NUGM the LSP neutralino can coannihilate with gluino and/or stop for m g, m t ≈ m χ01 ∈ [0.9 − 1.5] TeV. With the 100 TeV FCC collider one can probe the gluino masses up to about 6 TeV with 36.1 f b −1 integrated luminosity. We also find that the decay g → tt can indirectly probe the stop mass up to about 4 TeV.

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Section: Introductioncontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Gluino Search with Stop and Top in Nonuniversal Gaugino Mass Models at LHC and Future Colliders

Altin,

Cici,

Kirca

et al. 2019

Preprint

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“…Since the stop pair production is the trigger in all the signal processes, the pair production of the top quarks forms the most dominant background processes. Nevertheless, its final state is quite similar to the signal processes, and the cuts suppressing the background lead to a significant decrease in the signal cross-section [95]. Before concluding, we should note that the following approximation has been used in calculation of the cross-sections:…”

Section: Scanning Procedures and Experimental Constraintsmentioning

confidence: 99%

“…For instance, when the stop is allowed to decay into a top quark and a LSP neutralino, a class of SUSY GUTs with non-universal gaugino masses (NUGM) at the grand unification scale (M GUT ) can yield an exclusion at about 50% Confidence Level (CL), at most, in the region with mt 1 500 GeV (see, for instance, Refs. [94,95]), even though the analyses in MSSM exclude the same region at 95% CL [89,90].…”

Section: Introductionmentioning

confidence: 99%

Stop search in SUSY SO(10) GUTs with nonuniversal Gaugino masses

et al. 2020

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We explore the stop mass and its possible probe through a set of three different signal processes within a class of SUSY GUTs with non-universal gaugino masses. The stop mass can be realized in a wide range (0.4-8 TeV) consistent with the current experimental constraints. We consider the decay processes;t 1 → tχ 0 1 ,t 1 → bW ±χ 0 1 andt 1 → bqq χ 0 1 to be possible signals, and explore the impact of the current experimental results as well as the possible mass scales of stop, which can be probed in the future collider experiments. We find that the first and third signal processes can be tested in the current experiments, and significantly probed in future, while the second signal process is not available for the current experiments in this class of SUSY GUTs. We also comment that the second signal process can be available to be tested when the collider experiments are conducted at high center of mass energies and luminosity.

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“…First we present the stop and sbottom masses in Fig. 5 relevant background generated by the decay processes involving with the top quark significantly suppresses the possible signals from stop [57], such decays of the charged Higgs boson may not provide a detectable track. Fig.…”

Section: Fundamental Parameter Space and Mass Spectrummentioning

confidence: 99%

Charged Higgs boson in MSSM and beyond

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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Light stops and fine-tuning in MSSM

Cited by 5 publications

References 68 publications

Gluino Search with Stop and Top in Nonuniversal Gaugino Mass Models at LHC and Future Colliders

Gluino Search with Stop and Top in Nonuniversal Gaugino Mass Models at LHC and Future Colliders

Stop search in SUSY SO(10) GUTs with nonuniversal Gaugino masses

Charged Higgs boson in MSSM and beyond

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