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Remarks on the EEMC calibration in 2006

 
Abstract: We examine pi0 invariant mass spectra from the 2006 run, using isolated pions with no energy deposited in the 1st preshower layer w/in a radius of 0.3.   An invariant mass of 139.0 +/- 0.3 MeV is reconstruced, with no observed dependence on pseudorapidity.  Conversion rates observed by the preshower layers for identified pi0 decays, indicate that, on average, there are three photons w/in the cluster used to measure the energy of the pion.
 
Contents:

QM09 Proceedings

QM09 Proceedings - Chris Perkins

dAu east-west DCA asymmetry

Looking at the signed DCA of tracks on the east half of the TPC minus the west half of the TPC for Run 8 dAu data gives the following results using the calibrations for SpaceCharge and GridLeak ins

QA for 05/12/09 - 05/18/2009

Notes on pp2006 pi0 production for conversion rate estimation

Identified Pi0 Sample to Determine Background Conversion Rates

ZDC Polarimetry in p+p 200 GeV runs

1. Standard triggers zdc_smd_east and zdc_smd_west

Fill 10850

TPC sector

TPC Review Talk on spacecharge in pp500

Please choose the latest version of the talk.

Corrections to Simulation

The geometry and luminostiy asymmetries that showed up on the last post were do to a bug in the code.  Fortunately while looking for it I came across a couple other mistakes and was able to co

TPC Sector 16 time offset

I believe I see Tonko's sector 16 time offset in Run 9 physics data (using data from days 147-152). For the 11ns that Tonko sees, one should see 11ns * (5.5 cm/us) ~= 0.06 cm (600 microns).