[Rivet] Reading LHE v3 weights into RIVET

[Andy Buckley]

Hi Spyros,

Our plan was to write out separate histograms for every observable, with
paths specific to the weight names. That seems more reasonable than
modifying histograms to be intrinsically multi-weighted objects. But it
requires extra logic to decide how to turn those multiple histograms
into plotted bands or whatever -- I guess in the first version we will
just provide the extra data for those who want to use it, but keep on
plotting the nominal version only.

Andy


On 19/02/15 01:05, Spyridon Argyropoulos wrote:
> Hi Andy,
> 
> thanks for the reply. Then I guess a hack in the Pythia8 to HepMC interface should probably do the job.
> 
> I didn't have any particular form in mind on how to have the weights in the output. 
> A vector of doubles? 
> 
> Regards,
> Spyros
> 
> On Feb 19, 2015, at 1:58 AM, Andy Buckley wrote:
> 
>> On 19/02/15 00:35, Spyridon Argyropoulos wrote:
>>> Hi,
>>>
>>> I'm sure that this must have come up before, but I couldn't find the answer. 
>>>
>>> Is there any way to read a vector of weights from the LHE v3 format (the ones between the <rwgt> tags I mean) ?
>>
>> Not yet. We have most of a working implementation, but HepMC itself
>> doesn't yet provide a functional weight container (I'm working on fixing
>> it for a patch release) and as far as I know no (?) shower generators
>> are currently propagating the weights through to the HepMC output.
>>
>> Incidentally, how would you like to have the weights represented in the
>> output? We have a plan, but I'm interested to know what people expect!
>>
>> Andy
>>
>> -- 
>> Dr Andy Buckley, Royal Society University Research Fellow
>> Particle Physics Expt Group, University of Glasgow / PH Dept, CERN
> 


-- 
Dr Andy Buckley, Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow / PH Dept, CERN