Training for Generalist Graduates in the Commonwealth Public Service Board1

We show that supersymmetric models with a large Dirac gluino mass can evade much of the jets plus missing energy searches at LHC. Dirac gaugino masses arise from "supersoft" operators that lead to finite one-loop suppressed contributions to the scalar masses. A little hierarchy between the Dirac gluino mass 5 → 10 times heavier than the squark masses is automatic and technically natural, in stark contrast to supersymmetric models with Majorana gaugino masses. At the LHC, colored sparticle production is suppressed not only by the absence of gluino pair (or associated) production, but also because several of the largest squark pair production channels are suppressed or absent. We recast the null results from the present jets plus missing energy searches at LHC for supersymmetry onto a supersoft supersymmetric simplified model (SSSM). Assuming a massless LSP, we find the strongest bounds are: 748 GeV from a 2j + / ET search at ATLAS (4.7 fb −1 ), and 684 GeV from a combined jets plus missing energy search using αT at CMS (1.1 fb −1 ). In the absence of a future observation, we estimate the bounds on the squark masses to improve only modestly with increased luminosity. We also briefly consider the further weakening in the bounds as the LSP mass is increased.

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“…To estimate the effects of systematic errors, the number of SM events is modulated by a Gaussian weighting factor [70]. Specifically, we shift…”

Section: Recasting Lhc Limitsmentioning

confidence: 99%

“…Here µ i,b ≡ N i,exp is the number of expected SM background events and µ i,s ≡ N i,SU SY is the number of signal events. To estimate the effects of systematic errors, the number of SM events is modulated by a Gaussian weighting factor [70]. Specifically, we shift…”

Section: Recasting Lhc Limitsmentioning

confidence: 99%

Supersoft supersymmetry is super-safe

2012

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“…To account for the systematic uncertainty effect, we allow the number of background events in each channel to fluctuate: b i → b i (1 + δb i ). Following the analysis in [39], we convolve the Poisson distribution with a Gaussian weighting factor and then integrate over b i :…”

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confidence: 99%

Current experimental bounds on stop mass in natural SUSY

Han

Hikasa

et al. 2013

J. High Energ. Phys.

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Motivated by the recent progress of direct search for the productions of stop pair and sbottom pair at the LHC, we examine the constraints of the search results on the stop ($\tilde{t}_1$) mass in natural SUSY. We first scan the parameter space of natural SUSY in the framework of MSSM, considering the constraints from the Higgs mass, B-physics and electroweak precision measurements. Then in the allowed parameter space we perform a Monte Carlo simulation for stop pair production followed by $\tilde{t}_{1} \to t \tilde{\chi}_{1}^{0}$ or $\tilde{t}_{1} \to b \tilde{\chi}_{1}^{+}$ and sbottom pair production followed by $\tilde{b}_{1} \to b \tilde{\chi}_{1}^{0}$ or $\tilde{b}_{1} \to t \tilde{\chi}_{1}^{-}$. Using the combined results of ATLAS with 20.1 fb$^{-1}$ from the search of $\ell+{\rm jets}+\slashed E_{T}$, hadronic $t\bar{t}+\slashed E_{T}$ and $2b+\slashed E_{T}$, we find that a stop lighter than 600 GeV can be excluded at 95% CL in this scenario.Comment: Discussions added, accepted by JHE

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Graduate Preference: A Case Study in Administrative Dogmatism

Lyall¹

1969

Aust J Public Adm

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Training for Generalist Graduates in the Commonwealth Public Service Board1

Cited by 3 publications

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Supersoft supersymmetry is super-safe

Supersoft supersymmetry is super-safe

Current experimental bounds on stop mass in natural SUSY

Graduate Preference: A Case Study in Administrative Dogmatism

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