[Rivet] A few technical questions

[Andy Buckley]

Hi Alex,

We certainly want integrated cross-sections! But as you've noted, they 
are not really histograms then.

The best object to use, in my opinion, is a Scatter1D. You can book 
these via Analysis::bookScatter1D (at least in recent versions like 
2.4.x) and set their values and errors with a single call of 
_mys1.addPoint(...).

You can use a Scatter2D in the same way, of course, if that's what the 
ref data has to look like (I *think* HepData still doesn't know how to 
present single-value data): the x values and errors are then completely 
arbitrary and you just set them to what you like via either 
Scatter2D::addPoint() or Point::setX(), etc..

Hope that helps,
Andy


On 06/06/16 20:18, Alex Grecu wrote:
> Dear RIVET/YODA developers,
>
> I'm currently migrating some RIVET modules for LHCb measurements to the
> new YODA interface and I ran into an issue that would require your
> input/expertise to solve. Is there a way in YODA to plot a cross-section
> value with zero bin width? Or is it something you envisage implementing
> in the near future. So far, we conservatively set the bin width to 1
> unit (i.e. 7000 +- 0.5 for centre-of-mass energy), but I see there are
> older HepData records that have integrated XS values at 7000 +- 0.0.
> Depending on your answer I should know to ask for these records to be
> edited or not to include a non-zero bin width (if one still wants to
> produce integrated XS values with RIVET modules).
>
> Thank you in advance.
>
> Best regards,
> Alex
>
> --
> *LHCb* Experiment
> /Horia Hulubei/ National R&D Institute for Physics and Nuclear
> Engineering (IFIN-HH)
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-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow