[Halld-physics] new Bethe Heitler event generator

[Sean Dobbs]

Richard,

Thanks a lot for doing this.  Can you remind us, is Dirac++ a new library
which is needed for building this new program?

---Sean

On Fri, Mar 16, 2018 at 11:09 AM Richard Jones <richard.t.jones at uconn.edu>
wrote:

> Hello Lubomir and all,
>
> I have written a new Bethe Heitler generator for GlueX. It is presently
> housed under the HDGeant4 repo since it depends on several other generator
> classes that are distributed with HDGeant4. The update is found in a recent
> pull request that I posted to HDGeant4 on github. If someone outside GlueX
> wants to use it, I can extract it from this environment, but for the moment
> it is right at home where it is.
>
> The new program is found in HDGeant4/src/utils and is called genBH. To
> build it, you need to do "make utils" at the top level in the HDGeant
> directory. It is not built by default using "make". This prevents automatic
> build scripts from crashing if they do not have Dirac++ set up in their
> environment.
>
> Invoking it without arguments generates the following usage message.
>
> Usage: genBH -n <#> [options] <output_file.hddm>
>   where options may include any of the following
>      -t <#> : number of threads to run, default 1
>      -E <val> : energy of incident photon (GeV), default 9.0
>      -e <val> : use bremsstrahlung spectrum with endpoint e (GeV)
>
> The output is in hddm format, suitable for reading into a simulation,
> either hdgeant or hdgeant4.
>
> -Richard Jones
>
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