First Look at AN for p-Al (Day160)

We have downloaded and analyzed about 5 to 6 hours of data from Day160 (first p-Al data).
The runs are:

On the trigger page posted by Chris, these runs have index 1344-1354
The prescale factors are seen on his pages
We see that these are in the early fill region where prescaling is agressive.

The reconstruction of pions was done with an "all ones" set of calibration corrections. I am in the process of generating better gain correction factors for our new voltage settings.

 As I have before, I show the distribution of pi0 events as a function of pT for each of the 9 triggers (Bsum small(x3), Bsum large(x3), JetPatch(x3)).
For comparison, this is the trigger distribution at the start of pAu (Day126)

I also include a corresponding trigger analysis for pi0 events from Day070 at the beginning of pp running,  I should note that there were hardware fixes after Day70.

Based on comparing rates for reconstructed forward pion production, this 5 to 6 hours of p-Al data looks like it is equivalent to between 0.7 and 1 pb^(-1) of pp data.

On figure the right, the asymmetries are shown for pions of energy 25<E<35 GeV as a function of pT. The p-Al data points are plotted with "star" markers and points are joined by solid lines.  For comparison to a 29 pb^(-1) pp data set, the pp data are plotted with circles as markers  and joined with dashed lines.

For the p-Aluminum  AN point at pT=3.2 GeV, the Cos(Phi) distribution is shown (upper left). Remember the slope of the Cos(Phi) distribution is proportional to AN.  The p-Al mass distribution for this pT=3.2 GeV point is shown in the lower left.