Name: ATLAS_2022_I2182381
Year: 2022
Summary: Search for SUSY (gluino pair production) in multi-b final states
Experiment: ATLAS
Collider: LHC
InspireID: 2182381
Status: VALIDATED
Reentrant: true
Authors:
 - Tomasz Procter <t.procter.1@research.gla.ac.uk>
References:
 - 'https://doi.org/10.1140/epjc/s10052-023-11543-6'
 - 'arXiv:2211.08028'
 - 'ATLAS-SUSY-2018-30'
RunInfo: 'See hepdata for slha files. Testing was done using pythia, using the
          the flags `SUSY:gg2gluinogluino` and `SUSY:qqbar2gluinogluino`. Cross-
          section from the LHC susy working group twiki.'
Beams: [p+, p+]
Energies: [[6500,6500]]
Luminosity_fb: 139.0
Description:
  'A search for supersymmetry involving the pair production of gluinos decaying via off-shell third-generation
   squarks into the lightest neutralino ($\displaystyle\tilde\chi^0_1$) is reported. It exploits LHC proton--proton
   collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 139~fb$^{-1}$ collected
   with the ATLAS detector from 2015 to 2018. The search uses events containing large missing transverse momentum, up to
    one electron or muon, and several energetic jets, at least three of which must be identified as containing $b$-hadrons.
    Both a simple kinematic event selection and an event selection based upon a deep neural-network are used. No significant
    excess above the predicted background is found.  In simplified models involving the pair production of gluinos that
    decay via off-shell top (bottom) squarks, gluino masses less than 2.44~TeV (2.35~TeV) are excluded at 95\% CL for a
    massless $\displaystyle\tilde\chi^0_1$. Limits are also set on the gluino mass in models with variable branching ratios
    for gluino decays to $b\bar{b}\tilde\chi^0_1$, $t\bar{t}\tilde\chi^0_1$ and $t\bar{b}\tilde\chi^-_1$ / $\bar{t}b\tilde\chi^+_1$.'
ValidationInfo:
  'Cutflows for Gbb CC, Gbb NN, Gtt 0L CC, Gtt 1L CC and Gtt NN regions were
  compared to those on HEPDATA and matched very closely (see Rivet MR !745).

  Event generation used pythia and the slha files provided on HEPDATA,
  and Cross-Sections were corrected to higher order predictions based on
  the public results from the lhc susy group
  https://twiki.cern.ch/twiki/bin/view/LHCPhysics/SUSYCrossSections13TeVgluglu.
  
  The three Gtb signal regions could not be validated. Cutflow ratios were 
  broadly consistent, but the final results were out by a factor of approximately 1.6-1.8.

  Note also there is relatively strong dependence (O(10%) around our best guess)
  on the overflow bin value of the dependent b-tagging efficiencies, which is not
  provided in the MV2c10 paper. 
  '
#ReleaseTests:
# - $A my-hepmc-prefix :MODE=some_rivet_flag
Keywords: [search, bsm, susy, jets, met, bjets, onnx, ml]
BibKey: 'ATLAS:2022ihe'
BibTeX: '@article{ATLAS:2022ihe,
    author = "Aad, Georges and others",
    collaboration = "ATLAS",
    title = "{Search for supersymmetry in final states with missing transverse momentum and three or more b-jets in 139 fb$^{-1}$ of proton\textendash{}proton collisions at $\sqrt{s} = 13$~TeV with the ATLAS detector}",
    eprint = "2211.08028",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "CERN-EP-2022-213",
    doi = "10.1140/epjc/s10052-023-11543-6",
    journal = "Eur. Phys. J. C",
    volume = "83",
    number = "7",
    pages = "561",
    year = "2023"
}'
ToDo:
 - Gtb regions still don't really work

