[Rivet] ATLAS analysis to be included into Rivet

[Andy Buckley]

Hi Roman (and Kiran),

Just to let you know, we are finally *nearly* ready to make our
long-awaited Rivet 2.0.0 release: just a few more analyses need code
tweaks and then we will be very happy to get that version out! We'll
issue a final 1.x release shortly afterward, and a 2.0.1, to include the
most recent analyses you've sent us. Thanks for those, and apologies for
not replying earlier.

Since we're thinking about these updates now, I wondered if you had had
a chance to look at updating this FB correlation analysis to use event
weights? Otherwise I guess I will add it to the new releases as
"unvalidated".

Thanks again,
Andy


On 23/04/13 14:34, Roman Lysak wrote:
> 
>  Hi Hendrik,
> 
> 
> On 04/18/2013 04:07 PM, Hendrik Hoeth wrote:
>> Hi Roman, hi Kiran,
>>
>> Thus spake Roman Lysak (lysak at fzu.cz):
>>
>>>> I'm having a brief look at the code right now. Have you tested it with
>>>> weighted events? You do fill a weight vector _vecWeight, but never use
>>>> it. The regression seems to assume equal weights for all events. Is
>>>> that
>>>> correct?
>>> That is correct.
>>>
>>> The azimuthal part of the analysis includes the weights.
>>> The fwd-bkwd part of the analysis does not include the weights.
>> We've discussed this a bit, but we are very hesitant to put the analysis
>> into Rivet as it is. Weighted events get more and more common, and there
>> are plenty use cases for them (e.g. tuning an NLO generator). So at very
>> least we would put a mechanism in place such that weighted events would
>> throw an exception -- which of course would render that part of the
>> analysis useless for weighted runs.
> fine, we will try to update this so it properly account for weighted events
> 
>>
>> Therefore we would very much prefer a solution where the analysis has
>> proper support for weights. How much effort do you think that would be?
> not sure, I suppose we will not get help from the original authors of
> the analysis, so probably I will have to do it by myself. I will let you
> know.
> 
> Cheers,
>   Roman
> 
>>
>> Cheers,
>>
>>     Hendrik
>>
> 
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-- 
Dr Andy Buckley, Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow / PH Dept, CERN