[Rivet] Born and dressed level in Rivet

[Ulla Blumenschein]

Hi Andy,

Many thanks! I fear though for analyzers using EVNT, AOD, D3PD or
xAOD formats, we would have to provide
either an equivalent Tool or list manually the pdgIDs recommeded to
veto on our physics group wikis.
(I would advocate an isHadron tool  or a dressing tool that works on xAOD).
For the moment, I try to  find the src for the isHadron() method  but
so far I haven't found it yet in
http://lcgapp.cern.ch/project/simu/HepPDT/
I would like to compare with Holgers list and then send it to the subconveners..

Cheers,
Ulla







On Thu, Nov 7, 2013 at 6:10 PM, Andy Buckley <andy.buckley at cern.ch> wrote:
> Yep: at the moment, at least, there is no guarantee of how photon
> radiation from leptons is to be represented. It could appear as a vertex
> correction on the photon production, as a set of emissions from the
> lepton line, or something totally mysterious. Until there's some
> standard format, a complementary approach that chooses what *not* to
> accept is safest.
>
> Did the study of clustering all non-hadronic photons in an infinite cone
> (except for a near-beam cut) into a Z definition ever produce any plots?
> I was told earlier in the week that this "failed" but I would really
> like to know how it went wrong!
>
> By the way, the definition of a particle from a hadron/tau decay used in
> Rivet is the one here:
>
> https://rivet.hepforge.org/trac/browser/src/Core/Particle.cc#L19
>
> Note that we use the PID::isHadron() function rather than enumerating
> "all" hadrons. This is equivalent to the function of the same name
> provided in HepPID.
>
> Andy
>
>
> On 07/11/13 17:52, Ulla Blumenschein wrote:
>> Hi Holger,
>>
>> Exactly, this is one of the reasons I  want to advertise your option
>> as a SM base line ;-)
>> Do you have this comparative study somewhere in indico? I would like
>> to send a link to Jan and Pierluigi..
>>
>> Many thanks in advance,
>> Ulla
>>
>>
>> On Thu, Nov 7, 2013 at 5:46 PM, Holger Schulz
>> <hschulz at physik.hu-berlin.de> wrote:
>>> On 07/11/13 17:35, Ulla Blumenschein wrote:
>>>> Hi Holger,
>>>>
>>>> Many thanks, this sound like a good start. I hope I will soon be able
>>>> to compare this definition with the currently used definition in SM
>>>> where we request the photons to come from the W/Z/lepton, depending on
>>>> the generator..
>>>>
>>>> Cheers, Ulla
>>>>
>>>>
>>>>
>>> No problem.
>>> I did a similar comparison and found (IIRC) no difference between the two
>>> methods.
>>>
>>> Concerning the method where you ask for photons radiated off of leptons,
>>> does anyone
>>> have a feeling how future-proof this would be?
>>> What if at some point in the future there is a generator which does
>>> NLO photon radiation, shouldn't that dressing method have an intrinsic
>>> problem?
>>>
>>> Cheers,
>>> Holger
>>
>>
>>
>
>
> --
> Dr Andy Buckley, Royal Society University Research Fellow
> Particle Physics Expt Group, University of Glasgow / PH Dept, CERN



-- 
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    Ulla Blumenschein
    II Physik, Uni Goettingen
    Friedrich-Hund-Platz 1, D01.110
    phone: 0049-551-397645
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