Abstract
The search for new physics at high energy accelerators has been at the crossroads with very little hint of signals suggesting otherwise. The challenges at a hadronic machine such as the LHC is compounded by the fact that final states are swamped with jets which one needs to understand and unravel. A positive step in this direction would be to separate the jets in terms of their gluonic and quark identities, much in a similar spirit of distinguishing heavy quark jets from light quark jets that has helped in improving searches for both neutral and charged Higgs bosons at the LHC. In this work, we utilise this information using the jet substructure techniques to comment on possible improvements in sensitivity as well as discrimination of new resonances in the all hadronic mode that would be crucial in pinning down new physics signals at HL-LHC, HE-LHC and any future 100 TeV hadron collider.
Highlights
Inantly decay to either quarks,1 gluons or both against the huge QCD background is very difficult
Though our primary aim in this work is not distinguishing a quark jet from a gluon jet, our analysis procedure is still guided by similar jet substructure observables that help in quark-gluon discrimination
We studied dijet resonances at the Large Hadron Collider (LHC) and look at the application of jet substructure techniques to such resonances
Summary
The recent developments in the study of jet substructure provide us with one of the best ways to gather more information from a collider event with large hadronic activity [13,14,15,16,17]. It has been shown that theoretical understanding about the substructure of a jet can even allow us to differentiate between quark-initiated and gluoninitiated jets to a certain extent [18,19,20,21,22,23,24,25,26,27,28,29] due to the difference in their radiation pattern inside the jet Further improvements in this direction can be possible with the use of machine learning techniques which along with the substructure picture of the jets makes the discrimination even more robust and allows us to enhance the discrimination power between quark and gluon jets [30,31,32,33,34,35,36,37]. The overall fraction of quark jets and gluon jets in the collection of events will be determined by the relative coupling of the heavy boson with a quark pair and a gluon pair Note that such a fraction in the events could originate from non-resonant dijet or multijet production processes at a collider. We show how one can use jet substructure technique and the boosted decision tree (BDT) multivariate method to distinguish different type of resonances in the dijet channel
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