[Rivet] Rivet Query

[Debarati Roy]

Hi Andy,
             Many thanks. 
For the  test I need a feedback. 
Should I try the new projection with the existing Rivet version by modifying the existing Rivet projection according to  the new one or I need to do something else?

Regards,
Debarati
    
________________________________________
From: Andy Buckley
Sent: 26 August 2014 13:17
To: Debarati Roy; rivet at projects.hepforge.org
Cc: Albert Knutsson; Maxime Gouzevitch; Lars Sonnenschein
Subject: Re: [Rivet] Rivet Query

Hi Debarati,

I have added several calc() methods including one that accepts a Jets
list as input, and a M2sum() method even though this is trivial. I will
push it to our development branch later today if you want to test it or
just take a look at the new interface. Hope it works for you. It will
appear in the next Rivet release which should not be far away.

Andy


On 18/08/14 05:37, Debarati Roy wrote:
> Hi Andy,
>             That is nice.
>
>
> Thanks,
> Debarati
> ________________________________________
> From: Andy Buckley
> Sent: 18 August 2014 00:23
> To: Debarati Roy; rivet at projects.hepforge.org
> Cc: Albert Knutsson; Maxime Gouzevitch; Lars Sonnenschein
> Subject: Re: [Rivet] Rivet Query
>
> Hi Debarati,
>
> I will see if I can provide a calc() method on Hemispheres which will
> accept a vector of FourMomentum. You could that way assemble whatever
> you wanted as the input, with z components as original or zeroed. I'll
> let you know how that goes.
>
> I'll also look into providing an M2sum method.
>
> Andy
>
>
> On 15/08/14 11:01, Debarati Roy wrote:
>> Hi Andy, Thanks for your feedback. First of all I would like to give
>> you some more information regarding these hadronic event shape
>> calculations applied in this analysis.
>>
>> In this analysis for the calculation of the five hadronic event
>> shapes always the input variables we used are jet Px, Py, Pz and E.
>> In some of them we do not require that Pz component like the thrust,
>> total jet broadening.
>>
>> Now regarding your comments, For the total jet broadening I think
>> your calc method can be useful since we have used only transverse
>> component of momentum along with jet eta and phi. But for the total
>> jet mass the concept is very similar as  used in Hemispheres.cc for
>> mass2With and mass2Against. The difference exists in the input(always
>> jet's four momentum) and then total jet mass is the sum of  mass2With
>> and mass2Against(this one I called as M2sum() in my previous mail).
>> For the total transverse jet mass I think the same method can work
>> only again in transverse plane(Z component set to 0).  So over all I
>> would say the jet hemisphere projection will cover all:
>> broadening(setZ=0), total jet mass, total transverse jet mass(setZ=0)
>> with jet's four momentum as inputs. If the jet hemisphere  you do not
>> think should be added as a projection then I can try with the
>> analysis code.
>>
>> Please let us know your view.
>>
>> Regards, Debarati ________________________________________ From: Andy
>> Buckley Sent: 15 August 2014 01:09 To: Debarati Roy;
>> rivet at projects.hepforge.org Cc: Albert Knutsson; Maxime Gouzevitch;
>> Lars Sonnenschein Subject: Re: [Rivet] Rivet Query
>>
>> Hi Debarati,
>>
>> Those hemispheres are an e+e- observable, so I'm a bit surprised that
>> a non-transverse decomposition work at a hadron collider... but then
>> I'm not a hadronic event shapes expert. Are you using the jets to
>> build a "3D" hemispheres observable, or do you want to set the jet
>> z-components to zero and then run the hemispheres algorithm?
>>
>> If the latter, I guess we could expose a "calc()" method on the
>> projection so it can be used directly rather than via applyProjection
>> -- this is sometimes done with the FastJets projection, for example.
>>
>> If the former, then maybe we should supply a JetHemispheres
>> projection instead. It might be easier to just implement in the
>> analysis code, though, since projections are only really necessary
>> for code that's likely to appear in several analyses and which would
>> benefit from caching.
>>
>> I'd be happy to add a M2sum() method if you can define what it should
>> do.
>>
>> Cheers, Andy
>>
>>
>> On 14/08/14 16:10, Debarati Roy wrote:
>>> Hi Experts, I need some feedback regarding an analysis which we
>>> are planning to introduce in Rivet. It is a CMS analysis consists
>>> of the study of hadronic event shapes (arxiv link :
>>> http://arxiv.org/abs/arXiv:1407.2856). In this analysis five event
>>> shapes are studied, thrust, total jet broadening, total jet mass,
>>> total transverse jet mass, jet resolution parameter where each of
>>> the event shape variable is calculated by giving the input of final
>>> state jets momenta . I found that Rivet already has the thrust
>>> projection where jets momenta of an event can be given as input to
>>> calculate thrust.  But for other three variables (total jet
>>> broadening, total jet mass, total transverse jet mass) I observed
>>> that you have a similar but not identical projection named,
>>> https://rivet.hepforge.org/trac/browser/src/Projections/Hemispheres.cc
>>>
>>>
> In this projection you are taking the final state particles to calculate
>>> broadening and mass if I am not wrong whereas in this analysis the
>>> final state jets momenta are used. So is it possible to modify the
>>> existing projection to be more flexible so that we can run it over
>>> the final state jets too? Or is it possible that a different
>>> projection with a different name can be added? Also here
>>> https://rivet.hepforge.org/trac/browser/include/Rivet/Projections/Hemispheres.hh
>>>
>>>
> I could see that there exists different methods  M2high(), M2low(),
>>> M2diff(). Is it possible to introduce M2sum() as per this analysis
>>> requirement?
>>>
>>> Please let us know.
>>>
>>> Thanks, Debarati
>>>
>>>
>>> _______________________________________________ Rivet mailing list
>>> Rivet at projects.hepforge.org
>>> https://www.hepforge.org/lists/listinfo/rivet
>>>
>>
>>
>> -- 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
>
> --
> 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