Abstract
We introduce a new approach for jet physics studies using subtracted cumulants of jet substructure observables, which are shown to be insensitive to contributions from soft-particle emissions uncorrelated with the hard process. Therefore subtracted cumulants allow comparisons between theoretical calculations and experimental measurements without the complication of large background contaminations such as underlying and pile-up events in hadron collisions. We test our method using subtracted jet mass cumulants by comparing Monte Carlo simulations to analytic calculations performed using soft-collinear effective theory. We find that, for proton-proton collisions, the method efficiently eliminates contributions from multiparton interactions and pile-up events. We also find within theoretical uncertainty our analytic calculations are in good agreement with the subtracted cumulants calculated by using ATLAS jet mass measurements.
Highlights
Jets have become essential objects of study at high energy colliders
We first give the definition of subtracted jet mass cumulant Δ, and we demonstrate its robustness against soft uncorrelated emissions (SUEs) using Pythia Monte Carlo simulations
An advantage of our observable, compared to event by event subtraction techniques, is that our approach can be applied to existing data for which only the jet four-momenta are available
Summary
Jets have become essential objects of study at high energy colliders They are produced ubiquitously in hard scattering processes as well as hadronic decays of heavy particles. Theoretical precision is often limited by the need to model soft radiation such as from multiparton interactions (MPI) in hadron collisions, which are insensitive to the hard process in a wide range of energies. Instead of relying on algorithms to remove soft particles out of jets, we provide an alternative approach for comparing theoretical calculations directly to experimental measurements without the complication of modeling soft uncorrelated emissions (SUEs). Additive contributions from uncorrelated emissions can be removed, and the resulting subtracted cumulant is useful for precision jet physics studies. We show that the comparisons of our theoretical predictions performed using soft-collinear effective theory (SCET) [21,22,23,24,25,26] to the results computed from ATLAS measurements are in a good agreement
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