Re: Monte Carlo Data

[Tom Banks <tbanks@socrates.berkeley.edu>]

> >   2. If the latter, could we ask you to incorporate these track
> >      reconstruction effects so that they could be turned on and off?
> >      Basically, you'd need to generate a random decay direction for each
> >      mu's displacement, calculate the impact parameter between that decay
> >      track and the original mustop location, and use *that* calculated
> >      impact parameter (not the 'true' drift distance) when filling the
> >      lifetime histograms.  I think the code should be relatively
> >      straightforward to implement.
>
>    I store the origin and decay points, as well as a MC impact parameter
> in a TTree object, so in a sense, this is turned on without losing the
> value of r.

So which have you shown us?  Given the definitions

  r = muon displacement from origin at time of decay
  m = "minimum reconstructable displacement from origin at time of decay"

were your ratio plots in Analysis-Run8 ELOG #47 derived from fits of decay
rate vs. r or decay rate vs. m?  That is, when you say "impact parameter",
are you referring to 'r' or 'm'?  If you were already including the
"minimum reconstructable displacement" effect, yet you got a level ratio
plot, that would argue against our new hypothesis.  Damn.

Tom