Hi Kyle,

I use the routine:

org.lcsim.hps.util.ConvertToStdhep.java

to convert the output of MadGraph (lhe files) to stdhep.  There is quite a bit of crap in here, but I think for your needs there are the classes:

import hep.io.stdhep.StdhepBeginRun;
import hep.io.stdhep.StdhepEndRun;
import hep.io.stdhep.StdhepEvent;
import hep.io.stdhep.StdhepWriter;

…the meat is StdhepEvent, which takes in a bunch of arrays describing the event.

The API is here:

http://java.freehep.org/lib/freehep/api/hep/io/stdhep/StdhepEvent.html

isthep :  state of particle (i.e. 1 is final state)
idhep :  PDG id of particle (11 is electron, 13 is muon, -13 is anti-muon…etc)
jmohep :  list of mothers
jdahep :  list of daughters
phep :  momenta
vhep :  origins

look at "writeLHEEvent" in ConvertToStdHep.java to see how this works.


mg

On Oct 22, 2012, at 10:00 AM, "Graf, Norman A." <[log in to unmask]<mailto:[log in to unmask]>> wrote:

Hello Kyle,
There are several classes in hps-java (in util) which write stdhep files
based on input from text files. Have you looked at that code?
Norman

________________________________________
From: Kyle McCarty [[log in to unmask]<mailto:[log in to unmask]>]
Sent: Sunday, October 21, 2012 3:14 PM
To: Graf, Norman A.
Cc: hps-software
Subject: Re: StdHEP Generation and Format

I'm basically looking to do what Maurik suggested in his follow-up
e-mail. lcsim might be a good place to start with generating some
simple stdHEP files, so if there are any examples on how to do this,
that would be helpful. How complicated a beam can lcsim generate?

For the stdHEP files, Maurik has asked me to work on figuring out how
they are structured, so I was hoping that a library of some sort
exists to manipulate them in our software. Does SLIC or one of the
parts of the code use a library you could point me to?

Thanks for your assistance,

Kyle

On Sat, Oct 20, 2012 at 1:57 AM, Graf, Norman A.
<[log in to unmask]<mailto:[log in to unmask]>> wrote:
Hello Kyle,
MadGraph is one program useful for generating physics events, but you can
generate stdhep files fairly straightforwardly usng pretty much any of the
legacy event generators.
If you are only interested in generating diagnostic event samples there are
some classes in lcsim which make it fairly easy to do.
Let me know what you would like to do and we can set you up and get you
running.
You can open and browse stdhep files using JAS3.
Norman

________________________________________
From: [log in to unmask]<mailto:[log in to unmask]> [[log in to unmask]<mailto:[log in to unmask]>] On Behalf Of Kyle McCarty [[log in to unmask]<mailto:[log in to unmask]>]
Sent: Friday, October 19, 2012 6:16 PM
To: hps-software
Subject: StdHEP Generation and Format

Hello HPS-Software,

I am looking to learn how to generate StdHEP files in anticipation of
testing the muon detector files. I didn't see anything specifically on
the confluence site that seemed to explain how this is done. From what
I gather, they are generated using MadGraph. Is there a set of sample
instructions or such somewhere that I can follow to get a better idea
of how to do this?

I would also like to be able to read an StdHEP file and understand
what is inside. Since it handles conversion to StdHEP files, I imagine
that hps-java's ConvertToStdhep.java would contain some reference to
this file structure. Is there a specific library somewhere in hps-java
or SLIC that handles reading/writing StdHEP files?

Thanks,

Kyle McCarty

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