Name: CMS_2017_I1518399
Year: 2017
Summary: Differential $t\bar{t}$ production cross-section as a function of the leading jet mass for boosted top quarks at 8 TeV
Experiment: CMS
Collider: LHC
InspireID: 1518399
Status: VALIDATED
Reentrant: true
Authors:
 - Torben Dreyer <torben.dreyer@desy.de>
 - Roman Kogler <roman.kogler@cern.ch>
 - Johannes Haller <johannes.haller@cern.ch>
References:
 - TOP-15-015
 - arXiv:1703.06330
 - Submitted to Eur. Phys. J. C.
RunInfo:
 '$t\bar{t}$ events at $\sqrt{s}=8~\TeV$. Boosted topology requires high statistics in a single run or custom merging of the YODA files.'
Luminosity_fb: 19.7
Beams: [p+, p+]
Energies: [8000]

Description:
 'Measurement of the differential and normalised differential $t\bar{t}$ production cross
 section as a function of the leading jet mass. The measurement was performed in the lepton+jets channel
 and the fiducial measurement phase space is enriched with events where the leading jet includes all
 decay products of a hadronically decaying top quark.

 This analysis is to be run on ${t\bar{t}}$ simulation.

  The objects are defined as follows
  - Lepton: electron or muon originating from the decay of a W boson
  - Jets: jets are clustered from final state particles using the Cambridge-Aachen algorithm
    with a distance parameter of 1.2. If a lepton overlaps with a jet (distance in the
    eta-phi plane smaller 1.2) its four momentum is subtracted from the four momentum of the jet.

  Definition of the particle level phase space:
  - only ${\rm t\bar{t}}$ decays with one top quark decaying hadronically and one top quark
    decaying leptonically including an electron or muon from the W decay.
  - lepton $\pt > 45~\GeV$ and $|\eta| < 2.1$
  - at least one jet with $\pt > 400~\GeV$ and $|\eta| < 2.5$
  - a second jet with $\pt > 150~\GeV$ and $|\eta| < 2.5$
  - veto on additional jets with $\pt > 150~\GeV$ and $|\eta| < 2.5$
  - distance between the second jet and the lepton in the eta-phi plane $\Delta R(jet2, lepton)$ smaller 1.2
  - invariant mass of the leading jet larger than the invariant mass of the combination of the second jet and lepton

  The differential and normalised differential cross section was measured as a function of the leading jet mass.'

BibKey: Sirunyan:2017yar
BibTeX: '@article{Sirunyan:2017yar,
      author         = "Sirunyan, Albert M and others",
      title          = "{Measurement of the jet mass in highly boosted t-tbar
                        events from pp collisions at sqrt(s) = 8 TeV}",
      collaboration  = "CMS",
      year           = "2017",
      eprint         = "1703.06330",
      archivePrefix  = "arXiv",
      primaryClass   = "hep-ex",
      reportNumber   = "CMS-TOP-15-015, CERN-EP-2017-018",
      SLACcitation   = "%%CITATION = ARXIV:1703.06330;%%"
}'
ReleaseTests:
 - $A pp-8000-ttbar-sl-boosted
