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04 Oct 2022


UCL has been involved since the beginning of the LHC in understanding jets and measuring their production. UCL was involved in almost all publications on jet and dijet production in Run 1, and we have led two papers on jet vetos and azimuthal decorrelation in dijet events. We are also heavily involved in the jet trigger, with coordination positions and leaderhip roles.

UCL was instrumental in the proudction of a seminal paper, which pioneered a new line research in jets, exploring their internal structur, to determine whether they are produced by quarks, gluons, or haadronic decays of heavy particles like W, Z or Higgs bosons, or top quarks. We are involved in jet sunstructure studies, both improving the algorithms and measuring their performance, as well as in analyses measuring production of W and Z bosons in their hadronic decays and searches for new particles decaying into bosons.

Key Academics

Jon Butterworth
Mario Campanelli

Leadership Positions

Mario Campanelli - Jet physics convener 2011-2012; Jet trigger convener (or deputy) 2009-2014; Jet substructure Group Leader 2015-2016
Jon Butterworth - SM group convener 2010-2012

Key References

  • J. Butterworth, A. Davidson, M. Rubin, G. Salam, Jet substructure as a new Higgs search channel at the LHC
    Phys.Rev.Lett. 100 (2008) 242001
  • Inclusive and dijet cross sections
  • Measurement of dijet production with a veto on additional central jet activity in pp collisions at sqrt(s)=7 TeV using the ATLAS detector
  • Jet veto and azimuthal decorrelations
  • Inclusive jet cross sections
  • Cross-section for hadronically-decaying boosted vector bosons
  • Search for new resonances decaying into hadronically-decaying vector bosons
  • Combination of searches for WW, WZ and ZZ resonances
  • Identification of boosted, hadroncically decaying W bosons and comparison with data
  • Performance of the jet trigger during Run 1
    An event with two hadronic jets (in green and in red). The particles in each jet are not all concentrated around its center, but have a two-prong structure, indicating that both are the result of hadronic decays of bosons, producing two very nearby jets.