Invariant Jet Mass Measurements in $pp$ Collisions at $\sqrt{s}=200$ GeV at RHIC

Abstract

We present the first inclusive measurements of the invariant and SoftDrop jet mass in proton-proton collisions at $\sqrt{s}=200$ GeV at STAR. The measurements are fully corrected for detector effects, and reported differentially in both the jet transverse momentum and jet radius parameter. We compare the measurements to established leading-order Monte Carlo event generators and find that STAR-tuned PYTHIA-6 reproduces the data, while LHC tunes of PYTHIA-8 and HERWIG-7 do not agree with the data, providing further constraints on parameter tuning. Finally, we observe that SoftDrop grooming, for which the contribution of wide-angle non-perturbative radiation is suppressed, shifts the jet mass distributions into closer agreement with the partonic jet mass as determined by both PYTHIA-8 and a next-to-leading-logarithmic accuracy perturbative QCD calculation. These measurements complement recent LHC measurements in a different kinematic region, as well as establish a baseline for future jet mass measurements in heavy-ion collisions at RHIC.

arXiv comment13 pages, 7 figures

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• Measurement of groomed event shape observables in deep-inelastic electron-proton scattering at HERA
• Precision measurement of the longitudinal double-spin asymmetry for dijet production at intermediate pseudorapidity in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV
• Measurement of inclusive jet cross section and substructure in $p$$+$$p$ collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Exploring system size dependence of jet modification in heavy-ion collisions
• Jet substructure of light and heavy flavor jets at RHIC
• A New Herwig7 Underlying Event Tune: from RHIC to LHC Energies