The STAR experiment

Here’s a summary of results for null-test calculations of single-spin asymmetries for the Run 5 charged pion A_{LL} analysis plotted versus pT. Asymmetries are defined as (Y,B):

Yellow Beam: -1 x { (++ + +-) - (-+ + —) }
Blue Beam: -1 x { (++ + -+) - (+- + —) }
Like-Sign: (++) - (—)
Unlike-Sign: (+-) - (-+)

All the asymmetries incorporate final beam polarizations.

Geometry

- Beam pipe design and exosceleton update

- Andrew - update HFT

Hi,

the commitee also mentioned that we should simulate systematic errors.
They suggested that we give details about TPC spacecharge distortions during high