[Rivet] Les Houches use of Multi-Events branch

[Frank Siegert]

Hi David,

I agree that it's a good test, so completely support this (not that I
have any stake in the multi events branch anyway ;-)).

Just thought I'd mention for the case where a user wants to use an
official Rivet release version and still needs a (low-tech) solution
for correlated events it is also possible to use the NLOHisto1D
workaround:
https://rivet.hepforge.org/trac/browser/contrib/nlohisto/

Cheers,
Frank


On 8 June 2015 at 12:32, David Grellscheid
<david.grellscheid at durham.ac.uk> wrote:
> Hi Chris,
>
> It took us a day to figure out, but in the end, it's two small changes in
> Histo1D.cc:  b.xMean() -> b.xMid(), since xMean is not useful in the case of
> negative weight contributions. It can lie outside the range [xMin,xMax] for
> example! The symptom was that we got fills in bins that were below a
> kinematic cut.
>
> Also, I had to comment out the fill(...,0.0) that we did as a fudge to make
> sure each event was registered at least once. As written, it very obviously
> messes up the stats of the initial bin.
>
> Let's discuss more in Glasgow. There's also a major simplification to the
> weights handling we identified: there's no need to keep a vector of temp
> histos around, if all you do with them at the end is sum += temp[i].
>
> See you,
>
>   David
>
>
>
>
> On 08/06/2015 11:51, Chris Pollard wrote:
>>
>> I have no issue with this. Could you quickly explain what you needed to do
>> to get it into shape (for my own curiousity)?
>>
>> Chris
>>
>> On Mon, Jun 8, 2015 at 10:37 AM, David Grellscheid <
>> david.grellscheid at durham.ac.uk> wrote:
>>
>>> Hi all,
>>>
>>> Do you have any objections if I provide a tarball of the multi-events
>>> branch for a Les Houches study? Daniel Maitre helped me get it into
>>> shape,
>>> and I think it would be a good early test case. I've mentioned all the
>>> usual caveats, and I hope that we'll have a release out by the time they
>>> publish their studies as well.
>>>
>>> Please reply soon!
>>>
>>> Thanks,
>>>
>>>    David
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>>
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