High Energy Physics - Phenomenology · arXiv:1211.7261 v2 · submitted 30 Nov 2012
Top Polarization and Stop Mixing from Boosted Jet Substructure
The paper says
“We show that with 100 fb^(-1) of data, left and right 600 GeV stops can be distinguished to 4\sigma, and 800 GeV stops can be distinguished to 3\sigma.”
from the abstract · picked out as the main claim by a classifier
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Abstract
Top polarization is an important probe of new physics that couples to the top sector, and which may be discovered at the 14 TeV LHC. Taking the example of the MSSM, we argue that top polarization measurements can put a constraint on the soft supersymmetry breaking parameter A_t. In light of the recent discovery of a Higgs-like boson of mass 125 GeV, a large A_t is a prediction of many supersymmetric models. To this end, we develop a *detector level* analysis methodology for extracting polarization information from hadronic tops using boosted jet substructure. We show that with 100 fb^(-1) of data, left and right 600 GeV stops can be distinguished to 4\sigma, and 800 GeV stops can be distinguished to 3\sigma.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 1.00
What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.14 · human participants 0.02 · controlled comparison 0.08 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.08 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| Top polarization is an important probe of new physics that couples to the top sector, and which may be discovered at the 14 TeV LHC. | background 1.00 | 0.04 | 0.05 | asserted 0.53 |
| Taking the example of the MSSM, we argue that top polarization measurements can put a constraint on the soft supersymmetry breaking parameter A_t. | contribution 0.45 | 0.44 | 0.17 | hedged possibility 0.70 |
| In light of the recent discovery of a Higgs-like boson of mass ~125 GeV, a large A_t is a prediction of many supersymmetric models. | background 0.99 | 0.05 | 0.03 | asserted 0.81 |
| To this end, we develop a *detector level* analysis methodology for extracting polarization information from hadronic tops using boosted jet substructure. | method 0.59 | 0.92 | 0.08 | asserted 0.98 |
| We show that with 100 fb^(-1) of data, left and right 600 GeV stops can be distinguished to 4\sigma, and 800 GeV stops can be distinguished to 3\sigma. | result 1.00 | 0.91 | 0.72 | asserted 1.00 |
What kind of paper the classifier reports this is: method or tool 0.98 · evidence from simulation or computation 0.86
What was examined, and what was not
Sources read
- arXiv listing abstract v2
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
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- P abstract
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- S sections
- T body sentences
- C citations
- R cross-paper relations
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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,355 input tokens, $0.0002 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 1 Pith paper
Reviewed papers on Pith that cite this one. The full citation record
How the literature uses it
13 arXiv papers cite this in 19 sentences
Papers citing it · 11 sentences without a confident label
Cites it as support 1 paper
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Based on Monte Carlo methods, these jet substructure techniques have been demonstrated to work quite well in searching for top partners and bottom partners [ref] .
Hadronic $b^\prime$ search at the LHC with top and W taggers · Introduction · 0.96
Cites it as background 7 papers
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Measuring top polarization, in case of boosted hadronically decaying tops have been studied in [ref] .
Analyzing polarized boosted top from stop decay at high luminosity and high energy LHC · Polarization of top from stop decay · 0.87
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These hard subjets are the key to distinguishing hadronically decaying $W$ bosons from the QCD background, and their exploitation has formed a very productive industry in collider physics over the past few years, with strategies having been developed [ref] for tagging top quarks [ref] , Higgs bosons [ref] , heavy gauge bosons [ref] , and even hypothetical particles [ref] .
Tagging Boosted Ws with Wavelets · Introduction and motivation · 0.93
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Possibilities of measuring the top polarization and hence getting information on the stop mixing in direct stop-pair production at the LHC with $√(s)=14$ TeV were investigated in [ref] .
Top Polarization in Sbottom Decays at the LHC · Introduction · 0.82
What it cites · 14 sentences without a confident label
Uses the method or tool of 9 papers
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Using Herwig++ 2.5.0 [ref] with all physics effects (hadronization, ISR/FSR, MPI) included, we generated left ($sinθ= 0$), mixed ($tanθ= 0.25$) and right ($sinθ= 1$) $t̃_1t̃^*_1$ samples with masses 600 GeV and 800 GeV for the 14 TeV LHC under our simplified model.
Herwig++ Physics and Manual · Event generation and detector simulation · 1.00
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We consider the backgrounds $tt̅$+jets, $Z$+jets, $W$+jets and $tt̅+Z$, which we generated using MadEvent/MadGraph 5.1.3 [ref] + PYTHIA 6.4.25 [ref] (also with all physics effects), taking their leading order cross sections which are also shown in Table [ref].
MadGraph 5 : Going Beyond · Event generation and detector simulation · 1.00
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We modified the Delphes codebase to use FastJet 3.0.3 [ref] instead of the bundled version, as the newer version has an interface to manipulate subjets at specific clustering scales or steps.
FastJet user manual · Event generation and detector simulation · 1.00
Compares with 3 papers
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The distributions at pre-cut/tag parton-level match Ref. [ref] , except they have a downward left-to-right tilt due to the harder $b$-partons losing energy to FSR.
Polarized tops from new physics: signals and observables · Reconstruction quality · 1.00
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This algorithm differs from the Johns Hopkins top tagger [ref] by declustering more than two steps in the pruning stage if necessary, using a mass drop condition rather than a $p_T$ drop condition, having an absolute rather than fractional trimming threshold, requiring a $b$-tag instead of imposing a $W$ mass condition, and not imposing a top helicity angle condition (as this is our observable).
Top-tagging: A Method for Identifying Boosted Hadronic Tops · Reconstruction and tagging · 0.97
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Our algorithm differs also from the HEPTopTagger [ref] by not imposing the various two-subjet mass requirements, having a mandatory $b$-tag, and also by implementing four-subjet reconstruction.
Stop Reconstruction with Tagged Tops · Reconstruction and tagging · 0.99
Cites as background 7 papers
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For the $t+$ class, Ref. [ref] performed a signal-only parton-level formal calculation, followed by Refs. [ref] and [ref] performing a Monte Carlo-level analysis with backgrounds, acceptance cuts and smearing effects.
Measuring Top Quark Polarization in Top Pair plus Missing Energy Events · Motivation · 0.88
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For the $t+$ class, Ref. [ref] performed a signal-only parton-level formal calculation, followed by Refs. [ref] and [ref] performing a Monte Carlo-level analysis with backgrounds, acceptance cuts and smearing effects.
Polarized Tops from Stop Decays at the LHC · Motivation · 0.88
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For the $t+$ class, Ref. [ref] performed a signal-only parton-level formal calculation, followed by Refs. [ref] and [ref] performing a Monte Carlo-level analysis with backgrounds, acceptance cuts and smearing effects.
Polarized tops from new physics: signals and observables · Motivation · 0.88
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