Figure 1: Fully corrected measurement of the jet mass (M) in low-event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of p_T: 20 - 30, 30 - 45 GeV/c. The fully corrected data is represented by the blue star markers, with detector systematic uncertainties displayed as a shaded blue band, and compared to the preliminary p+p measurement in black markers with a black band denoting the systematic uncertainties. No ratio is taken here as we will need to determine the degree of correlation of the respective uncertainties. The statistical errors have been enlarged by hand to account for a mishandling of statistics in the RooUnfold package. After this correction, all error bars remain smaller than the star markers. Additionally, open boxes are drawn on the low-EA data to represent the additional embedding/background uncertainty.

Observations:

• The jet mass increases with increasing p_T 
• The low-EA p+Au and the p+p are comparable throughout.

Figure 2: Fully corrected measurement of the groomed jet mass (M_{g}) in low-event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of ungroomed jet p_T: 20 - 30, 30 - 45 GeV/c. See Fig. 1 for further description.

Observations:

• The most probable value of the groomed jet mass is relatively constant with increased p_T while the tail of the distribution becomes more skewed.
• The groomed mass distributions are shifted to lower mass than the ungroomed distributions.
• The low-EA p+Au and the p+p are comparable throughout.

Figure 3: Fully corrected measurement of the jet mass (M) in high-event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of jet p_T: 20 - 30, 30 - 45 GeV/c. See Fig. 1 for further description. We assume correlated detector uncertainties and correlated embedding/background uncertainties in taking the ratio (blue star markers) of low-EA to high-EA data (bottom panels). The shaded gray band is the detector uncertainty, while the open boxes are the additional embedding+background uncertainty.

Observations:

• Any possible increase of the jet mass with event activity is very slight and only occurs in the highest p_T bin
• The ratio is consistent with unity within statistical and systematic uncertainties in most bins

Figure 4: Fully corrected measurement of the jet mass (M_{g}) in high-event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of ungroomed jet p_T: 20 - 30, 30 - 45 GeV/c. See Fig. 3 for further description.

Observations:

• Any possible increase of the jet mass with event activity is very slight and only occurs in the highest p_T bin

Figure 5: Fully corrected measurement of the jet mass (M) in high event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of jet p_T: 20 - 30, 30 - 45 GeV/c and compared to the fully corrected measurement of the same quantity in p+p collisions at \sqrt{s} = 200 GeV. The red distribution is the same as the red distribution from Fig. 3. The black distribution is the same as the black distribution from Fig. 1. This figure allows for direct comparison of high-EA p+Au to p+p.

Observations:

• The data are comparable

Figure 6: Fully corrected measurement of the jet mass (M_{g}) in high event-activity (EA) p+Au collisions at \sqrt{s} = 200 GeV for anti-k_T charged + neutral jets plotted differentially in bins of ungroomed jet p_T: 20 - 30, 30 - 45 GeV/c and compared to the fully corrected measurement of the same quantity in p+p collisions at \sqrt{s} = 200 GeV. See Fig. 5 for further description.

Observations:

• See observations for Fig. 2