Hi, as said at meeting no objections (I believe).
However one more comment: these "tails" of distributions (very low p,
large z) are useful to normalize to in a background model, e.g. comparison
of empty to gas data. I don't think the momentum cuts are too stringent
for that. I feel that should be enough and I would not cut on Z (it is
already cut to +- 50 cm, right ?)
-- tancredi
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
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On Wed, 15 Sep 2004, Chi Zhang wrote:
>
> Hi,
>
> To put something in meeting to action, I would like to ask for objections
> to raise minimal track momentum for the coming recrunch to 150MeV.
>
> The proposal is that when recrunching from DST, lrd will skip any tracks
> with momentum below 150MeV reconstructed by the original crunch from lrn.
> The hope is that this will fasten up the recrunch by a lot without impact
> on any physics analysis.
>
> So the question is that is there any analysis expecting electons, protons,
> pions with momentum lower than say 200MeV? If so please yell out loud
> ASAP, before a cutoff is coded in. Please leave enough room for error
> though, if you want 150MeV protons, it is probably safe to ask for a lower
> cut off, say 110-120.
>
> I also propose a cut off of: |Z|<35cm. If you look at online GUI, you ll
> see that there is a big chunk of data from outside this range yet all we
> use are within +-20cm.
>
> Please let me know of any opinion ASAP so I can prepare the code for the
> recrunch.
>
>
> Chi
>
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