Mass depletion: a new parameter for quantitative jet modification

Abstract

We propose an extension to classify jet modification in heavy-ion collisions by including the jet mass along with its energy. The mass of a jet, as measured by jet reconstruction algorithms, is constrained by the jet's virtuality, which in turn has a considerable effect on such observables as the fragmentation function and jet shape observables. The leading parton, propagating through a dense medium, experiences substantial virtuality (or mass) depletion along with energy loss. Meaningful comparisons between surviving jets and jets produced in $p$-$p$ collisions require mass depletion to be taken into account. Using a vacuum event generator, we show the close relationship between the actual jet mass and that after applying a jet reconstruction algorithm. Using an in-medium event generator, we demonstrate the clear difference between the mass of a surviving parton exiting a dense medium and a parton with a similar energy formed in a hard scattering event. Effects of this difference on jet observables are discussed.

4 pages, 4 figures, revtex

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• The JETSCAPE framework: p+p results
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• Invariant Jet Mass Measurements in $pp$ Collisions at $\sqrt{s}=200$ GeV at RHIC
• Exploring jet substructure with jet shapes in ALICE
• $p_T$ dispersion of inclusive jets in high-energy nuclear collisions
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