Using StHbt to examine Gstar input files for MDC3

Here is a copy of the email I sent to the hbt-l list

Hello Interferometers,
	I have been getting the machinery going to generate event
files with 2-particle correlations in them for MDC3.  This follows
the general plan I sent out a few weeks ago.  The files have pions,
kaons, protons, lambdas, and phi's in them, with the following
2-particle correlations
* piplus-piplus
* piplus-piminus
* piminus-piminus
* kplus-kplus
* kplus-kminus
* kminus-kminus
* k0-k0
* proton-proton
* proton-Lambda
* Lambda-Lambda  (although this one has the wrong shape!)

	The idea, as mentioned before, is 
1) we generate 50K events of three different parameter
   (multiplicities and hbt parameters) sets, and then
2) Ron Longacre converts these text files to ntuples which Pavel likes
3) Pavel runs GSTAR on them
4) Lidia makes DSTs out of them
5) we analyse them in MDC3

	Steps 3 and 4 take quite some time, so it is important that
the ball is rolling now.  I am generating ~5-8 Kevents/day.

	The machinery to generate these extends Lanny's framework
quite a bit, so we would like to check the files before moving past
step (1) above.
	For this reason, I have written a new Reader class,
StHbtGstarTxtReader, which takes input from these text files I
am making in step (1).  (As with all Reader classes, it takes its
input and converts it into a StHbtEvent, so that the rest of the
StHbt code just works the same as always.)

	So, by using the StHbtGstarTxtReader, you can have a
"pre-MDC3" glimpse of how it should look like if the tracking
is perfect.  With the macro StHbtMaker/doc/ExamineTxtFile.C
I made the followingcorrelation functions:
1) proton-proton, kplus-kplus, kplus-kminus, using 250 events (~15 min)
2) piplus-piplus, piplus-piminus, using 15 events (~15 min)

Plots of these correlation functions can be found on the web at:
STAR HBT web page -> projects -> input correlation functions for MDC3

	Please take a look-- hopefully it will look something like
this (or better) at MDC3!

Cheers,
Mike

P.S. If anybody would like to play with one of these Gstar text input
     files, I have put one in the hbt disk at rcf:
     /star/rcf/pwg/hbt/GstarTextFiles/blended_events.txt
     It has 1000 events in it.  Just use the ExamineTxtFile.C
     macro mentioned above.

P.P.S. Right now the StHbtGstarTxtReader does NOT make StHbtV0's out
     of the Lambdas and K0shorts in the Gstar text files; it just
     ignores them.  If somebody would upgrade StHbtGstarTxtReader
     to handle these, then we could make sure that the K0-K0 and
     proton-Lambda correlations look ok.  Else we have to wait until
     MDC3.

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Here is the piplus-piplus correlation function, from 250 events

Here is the piplus-piminus correlation function, from 250 events

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Here is the proton-proton correlation function, from 250 events

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Here is the kplus-kplus correlation function, from 250 events

Here is the kplus-kminus correlation function, from 250 events

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