Volker
On Mon, 25 May 1998, Lee Cole Smith wrote:
> >>I don't think we should do anything to the data since we are not using
> >>the pi+ data to make them look like the data but to do the acceptance
> >>corrections, which should be little affected by this bug.
>
> I agree, I just didn't want anyone to draw any unwarranted conclusions
> about the physics in AO. I think it is also worthwhile to try to make
> some absolute comparison to the data. It was in doing so that the bug
> was discovered.
>
> My point was that the pi+ channel has special problems the p channel
> doesn't since you have a lot of low momentum pions filling up the
> acceptance. Even with the bug fix we are seeing discrepancies between
> sim and data in the pi+ channel that to my eye look like pion decay
> effects. In GSIM we have secondaries turned off so pions
> which decay before leaving the DCs simply disappear, whereas in the real
> data the decay muon may result in the track being reconstructed with
> a different momentum or possibly even different sign.
>
> Cole
> cole@apollo.phys.virginia.edu
>
>