Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in $\sqrt{s}=7~\mbox{TeV}$ proton–proton collisions with the ATLAS experiment

We consider a comprehensive set of simplified models that contribute to final states with top and bottom quarks at the LHC. These simplified models are used to create minimal search strategies that ensure optimal coverage of new heavy flavor physics involving the pair production of color octets and triplets. We provide a set of benchmarks that are representative of model space, which can be used by experimentalists to perform their own optimization of search strategies. For data sets larger than 1 fb −1 , same-sign dilepton and 3b search regions become very powerful. Expected sensitivities from existing and optimized searches are given.

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“…A study [71] with 35 pb −1 using opposite-sign or same-sign dileptons, with a missing energy cut E T > 150 or 100 GeV, respectively.…”

Section: Expected Limits From Existing Lhc Searchesmentioning

confidence: 99%

Heavy flavor simplified models at the LHC

Essig

Izaguirre

Kaplan

et al. 2012

J. High Energ. Phys.

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“…5 Nonetheless, and in the absence of anything better, Method A instead usesn R andn F as estimators for the unknown and unknowable actual rates of real and fake events, ν R and ν F .…”

Section: Events With Only One Leptonmentioning

confidence: 99%

“…6 This happens in real analyses (e.g. [5]) creating problems that need to be solved by ad-hoc methods. Both Method B and Method C have the benefit of avoiding such problems.…”

Section: Jhep11(2014)031mentioning

confidence: 99%

Improving estimates of the number of ‘fake’ leptons and other mis-reconstructed objects in hadron collider events: BoB’s your UNCLE

Gillam

Lester

2014

J. High Energ. Phys.

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We consider current and alternative approaches to setting limits on new physics signals having backgrounds from misidentified objects; for example jets misidentified as leptons, b-jets or photons. Many ATLAS and CMS analyses have used a heuristic "matrix method" for estimating the background contribution from such sources. We demonstrate that the matrix method suffers from statistical shortcomings that can adversely affect its ability to set robust limits. A rigorous alternative method is discussed, and is seen to produce fake rate estimates and limits with better qualities, but is found to be too costly to use. Having investigated the nature of the approximations used to derive the matrix method, we propose a third strategy that is seen to marry the speed of the matrix method to the performance and physicality of the more rigorous approach.

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“…Furthermore, negative LHC SUSY searches have also suggested that the SUSY spectrum might be far heavier than what had previously been considered [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107]. Moreover, the sensitivity of the experiments dedicated to the observation of low-energy cLFV transitions has also significantly improved [108], especially in what concerns µ → eγ decays [109] and µ − e conversion in nuclei [110,111].…”

Section: Jhep08(2012)138mentioning

confidence: 99%

“…The low-energy sparticle masses and mixings have been numerically evaluated with the SPheno public code [121]. LHC bounds on the SUSY spectrum [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107] have been applied; in all cases, the lightest Higgs mass is around 117 GeV, still marginally compatible with the new LHC data [122,123]. Notice that the non-minimal SUSY scenarios can still be considered to accommodate such data, with a minimal impact concerning the present lepton flavour dedicated analysis.…”

Section: Jhep08(2012)138mentioning

confidence: 99%

Lepton flavour violation: physics potential of a Linear Collider

Abada

Figueiredo

Romão³

et al. 2012

J. High Energ. Phys.

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Abstract:We revisit the potential of a Linear Collider concerning the study of lepton flavour violation, in view of new LHC bounds and of the (very) recent developments in lepton physics. Working in the framework of a type I supersymmetric seesaw, we evaluate the prospects of observing seesaw-induced lepton flavour violating final states of the type e µ plus missing energy, arising from e + e − and e − e − collisions. In both cases we address the potential background from standard model and supersymmetric charged currents. We also explore the possibility of electron and positron beam polarisation. The statistical significance of the signal, even in the absence of kinematical and/or detector cuts, renders the observation of such flavour violating events feasible over large regions of the parameter space. We further consider the µ − µ − + E T miss final state in the e − e − beam option finding that, due to a very suppressed background, this process turns out to be a truly clear probe of a supersymmetric seesaw, assuming the latter to be the unique source of lepton flavour violation.

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Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in $\sqrt{s}=7~\mbox{TeV}$ proton–proton collisions with the ATLAS experiment

Cited by 45 publications

References 41 publications

Heavy flavor simplified models at the LHC

Heavy flavor simplified models at the LHC

Improving estimates of the number of ‘fake’ leptons and other mis-reconstructed objects in hadron collider events: BoB’s your UNCLE

Lepton flavour violation: physics potential of a Linear Collider

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