It was decided in the ANL-VU meeting that we would proceed toward a preliminary result utilizing the most recent trees and the new TPC run list. Here, I present the status of the transverse asymmetries having integrated these new runs using the newest trees.

Figure 1

The asymmetries still measure zero. Perhaps, the additional statistics are smoothing out some of the fluctuation in p_T.

Figure 2

Table 1

Here, I have fit the p₀ distributions with a constant. The offsets for the blue beam x_F and p_T fits are 1.53σ and 1.2σ from zero, respectively. The χ² for the yellow beam x_F fit is 1.87σ from expectation.

Figure 3

Figure 3 shows our data compared with previous publications, namely STAR FPD data and E704 data. PHENIX has preliminary results for neutral-energy clusters at forward pseudorapidity which pick up at x_F = 0.25. To be clear, our results are not yet "STAR Preliminary." The data have been so labeled solely for clarity.

Table 2: x_F > 0

Again, the systematic uncertainties include adjusting the background asymmetry and mass window. The statistical uncertainties include uncertainties from the fit parameters, previously included in both statistical and systematic uncertainties. In one bin, the background asymmetry systematic leads, while the mass window leads nine other bins. In one bin the systematic uncertainty is evenly split. In all eleven bins, the statistical uncertainties are larger than the systematic uncertainties.

Table 3: x_F < 0

For one bin of x_F < 0, the systematic uncertainty is larger than the statistical uncertainty. Likely, we can better constrain this uncertainty by examining multiple mass windows and calculating a sort of standard deviation. This will be left for the final results. In four bins, the background asymmetry leads, while for the other seven, the mass window leads.

Figure 4

In Fig. 4 I show the kinematic scatter plot for the pion candidates. The cut ranges are shown in red.

Run List

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