LHC luminosity and energy upgrades confront natural supersymmetry models

Baer, Howard; Barger, V.; Gainer, James S.; Sengupta, Dibyashree; Serce, Hasan; Tata, Xerxes

doi:10.1103/physrevd.98.075010

Cited by 37 publications

(53 citation statements)

References 106 publications

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“…We emphasize again that neutralino content of dark matter in the model is typically small order a percentage or less, and thus bulk of the dark matter must have a different source such as ultralight dark axion mentioned earlier [56,57]. The fact that the neutralino content of dark matter is small also appears in other recent models with small µ discussed in [43][44][45]. Figure 6: The SI proton-neutralino cross-section exclusion limits as a function of the LSP mass from XENON1T results taken from [121].…”

Section: Dark Matter Direct Detectionsupporting

confidence: 53%

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Aboubrahim

Nath

2018

Phys. Rev. D

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One of the early criterion proposed for naturalness was a relatively small MSSM Higgs mixing parameter µ with µ/M Z of the order of a few. A relatively small µ may lead to heavier Higgs masses (H 0 , A, H ± in MSSM) which are significantly lighter than other scalars such as squarks. Such a situation is realized on the hyperbolic branch of radiative breaking of the electroweak symmetry. In this analysis we construct supergravity unified models with relatively small µ in the sense described above and discuss the search for the charged Higgs boson H ± at HL-LHC and HE-LHC where we also carry out a relative comparison of the discovery potential of the two using the decay channel H ± → τ ν. It is shown that an analysis based on the traditional linear cuts on signals and backgrounds is not very successful in extracting the signal while, in contrast, machine learning techniques such as boosted decision trees prove to be far more effective. Thus it is shown that models not discoverable with the conventional cut analyses become discoverable with machine learning techniques. Using boosted decision trees we consider several benchmarks and analyze the potential for their 5σ discovery at the 14 TeV HL-LHC and at 27 TeV HE-LHC. It is shown that while the ten benchmarks considered with the charged Higgs boson mass in the range 373 GeV-812 GeV are all discoverable at HE-LHC, only four of the ten with Higgs boson masses in the range 373 GeV-470 GeV are discoverable at HL-LHC. Further, while the model points discoverable at both HE-LHC and HL-LHC would require up to 7 years of running time at HL-LHC, they could all be discovered in a period of few months at HE-LHC. The analysis shows that a transition from HL-LHC to HE-LHC when technologically feasible would expedite the discovery of the charged Higgs for the benchmarks considered in this work. We note that the observation of a charged Higgs boson with mass in the range indicated would lend support to the idea of naturalness defined by a relatively small µ and further, it will lend support to radiative breaking of the electroweak symmetry occurring on the hyperbolic branch. *

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Section: Dark Matter Direct Detectionsupporting

confidence: 53%

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Aboubrahim

Nath

2018

Phys. Rev. D

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“…Typically this leads to the average squark masses also lying in the TeV region. Such a situation is realized on the hyperbolic branch of radiative breaking of electroweak symmetry [34][35][36] (for related works see [37][38][39][40][41]). It turns out that there are at least two ways in which the squark masses may be large, i.e., either m 0 is large or m 3 is large lying in the several TeV region while m 0 can be relatively small.…”

Section: Model Implementation and Long-lived Staumentioning

confidence: 99%

Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays

Aboubrahim

Nath

2019

Phys. Rev. D

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We investigate a class of models where the supergravity model with the standard model gauge group is extended by a hidden sector U (1) X gauge group and where the lightest supersymmetric particle is the neutralino in the hidden sector. We investigate this possibility in a class of models where the stau is the lightest supersymmetric particle in the MSSM sector and the next-to-lightest supersymmetric particle of the U (1) X -extended SUGRA model. In this case the stau will decay into the neutralino of the hidden sector. For the case when the mass gap between the stau and the hidden sector neutralino is small and the mixing between the U (1) Y and U (1) X is also small, the stau can decay into the hidden sector neutralino and a tau which may be reconstructed as a displaced track coming from a high p T track of the charged stau. Simulations for this possibility are carried out for HL-LHC and HE-LHC. The discovery of such a displaced track from a stau will indicate the presence of hidden sector dark matter. *

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“…One can see that ∆ EW < 30 is a conservative condition which accomodates 3.3% or less finetuning and allowsμ up to ∼ 360 GeV. The condition for naturalness puts strong bounds on stop and gluino masses [24]. For various natural MSSM models, and independent of the neutrino sector, upper limits have been calculated as mt 1 3.5 TeV and mg 6 TeV (with the exception of the natural anomaly mediated SUSY breaking model (nAMSB) [25] where gluino mass can reach up to 9 TeV).…”

Section: Introductionmentioning

confidence: 99%

Lepton flavor violation from SUSY with nonuniversal scalars

Baer

Barger

Serce

2019

Phys. Rev. Research

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Right-handed neutrinos in supersymmetric models can act as the source of lepton flavor violation (LFV). We present experimental implications of lepton flavor-violating processes within a supersymmetric type-I seesaw framework in the three-extra-parameter non-universal Higgs model (NUHM3) for large (PMNS-like) and small (CKM-like) Yukawa mixing scenarios. We highlight LFV predictions for the natural (low ∆ EW ) portion of parameter space. Our numerical analysis includes full 2-loop renormalization group running effects for the three neutrino masses and mass matrices. We show the projected discovery reach of various LFV experiments (i.e. Mu2e, Mu3e, MEG-II, Belle-II), and specify regions that have already been excluded by the LHC searches. Our results depend strongly on whether one has a normal sneutrino hierarchy (NSH) or an inverted sneutrino hierarchy (ISH). Natural SUSY with a NSH is already excluded by MEG-2013 results while large portions of ISH have been or will soon be tested. However, LFV processes from natural SUSY with small Yukawa mixing and an ISH seem below any projected sensitivities. A substantial amount of the remaining parameter space of models with large PMNS-like sneutrino mixing will be probed by Mu2e and MEG-II experiments whereas small, CKM-like Yukawa mixing predicts LFV decays which can hide from LFV experiments. *

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LHC luminosity and energy upgrades confront natural supersymmetry models

Cited by 37 publications

References 106 publications

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays

Lepton flavor violation from SUSY with nonuniversal scalars

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