# 2006 Neutral Pion Paper Page

**Proposed Title:** "Double longitudinal spin asyymetry and cross sectrion for inclusive neutral pion production at midrapidity in polarized proton collisions at Sqrt(s) = 200GeV"

**PAs:** Alan Hoffman, Joe Seele, Bernd Surrow, ...

**Target Journal:** PRD - Rapid Communication

**Abstract:**

**Figures:**

The first two figures are obvious: the cross section plot and the A_LL plot. The third is less so. I offer a number of options below.

1)

Caption 1. Cross section for inclusive \pi^0 production. a) The unpolarized cross section vs. P_T. The cross section points are plotted along with NLO pQCD predictions made using DSS and KKP fragmentation functions. b) Statistical and systematic uncertainties for the cross section measurement. c) Comparison of measured values to theoretical predictions. Predictionsa re shown for three different fragmetnation scales to give an idea of theoretical uncertainty.

2)

Caption 2. The longitudinal double spin asymmetry, A_LL, vs. P_T for inclusive \pi^0 prodution. The error bars are purely statistical. The systmatic uncertainty is represented by the shaded band beneath the points. The measurement is compared to a number of NLO pQCD predictions for different input values of \Delta G.

3) Option 1

Caption: Comparison between Data and Simulation for energy asymmetry Z_gg = |E1 - E2|/(E1 + E2). (Ed. Note: The nice thing about this plot is that it would not require too much supporting explanation in the text. Readers would know what it means. "Monte Carlo" could be changed to "Pythia + Geant" to be more specific.)

3) Option 2

Caption: Left: Two photon invariant mass distribution for data (black points) and various simulation components. Right: Same data distribution compared to combined simulation. (Ed. Note: This plot would require us to describe the whole mass-peak simulation scheme, which may be outside the scope of the paper.)

3) Option 3

Some combination of these two plots showing the A_LL points and then the P-values associated with various pQCD predictions. This would follow the example set by the jet group.

**Summary and Conclusions:**

**Supporting Documentation:**

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