MadGraph5_aMC@NLO

Problem with fragmentation in MadGraph

Asked by maria hoffmann on 2013-12-09

Dear MadGraphers,

I am trying to generate a simple process in MG5 (generate p p > z z, z > u u~) with fragmentation enabled in the pythia_card (MSTJ(1)=1). From the pythia logfile it is clear to me that the fragmentation works as intended; I do indeed get a cascade of light hadrons etc. Here is my problem: the particles originating from the fragmentation are not stored in the output root-file (named something like tag_1_pythia_lhe_events.root) or the lhe-file. However, particles originating from ISR/FSR are. Have I forgotten to enable some jet-switch in a some card, or what is going on here?

Thanks a lot

cheers,
Maria

The following is a print of the first event from my tag_1_pythia_lhe_events.root

New event, number of particles: 12
Event# 1 nparticle 0 PID 3 status -1 Particlemother 0 Particlemother PID 3
Event# 1 nparticle 1 PID -3 status -1 Particlemother 0 Particlemother PID 3
Event# 1 nparticle 2 PID 23 status 2 Particlemother 1 Particlemother PID -3
Event# 1 nparticle 3 PID 23 status 2 Particlemother 1 Particlemother PID -3
Event# 1 nparticle 4 PID 2 status 2 Particlemother 3 Particlemother PID 23
Event# 1 nparticle 5 PID -2 status 2 Particlemother 3 Particlemother PID 23
Event# 1 nparticle 6 PID 2 status 2 Particlemother 4 Particlemother PID 2
Event# 1 nparticle 7 PID -2 status 2 Particlemother 4 Particlemother PID 2
Event# 1 nparticle 8 PID 21 status 1 Particlemother 0 Particlemother PID 3
Event# 1 nparticle 9 PID 21 status 1 Particlemother 0 Particlemother PID 3
Event# 1 nparticle 10 PID 21 status 1 Particlemother 0 Particlemother PID 3
Event# 1 nparticle 11 PID 21 status 1 Particlemother 0 Particlemother PID 3

The same event from tag_1_pythia.log

Event listing (standard)

I particle/jet K(I,1) K(I,2) K(I,3) K(I,4) K(I,5) P(I,1) P(I,2) P(I,3) P(I,4) P(I,5)

1 !p+! 2 !p+! ====== 21 2212 0 0 0 0.00000 0.00000 -6999.99994 7000.00000 0.93827
/>============================================================================================================================
21 1 1 0 0 -1.49176 -3.21717 3888.07605 3888.07767 0.00000
21 21 2 0 0 -0.00315 -1.43688 -14.20468 14.27717 0.00000
21 1 3 0 0 -7.54927 -12.41503 2447.37040 2447.41353 0.00000
21 -1 4 0 0 -13.30503 5.08444 8.81087 16.74833 0.00000
21 23 0 0 0 26.53989 3.82318 1522.95463 1525.91528 91.14633
21 23 0 0 0 -47.39418 -11.15378 933.22664 938.24658 83.80975
21 2 7 0 0 33.90960 37.48196 1212.76213 1213.81496 0.00000
21 -2 7 0 0 -7.36971 -33.65878 310.19250 312.10032 0.00000
21 2 8 0 0 -8.92739 31.37072 525.02834 526.04047 0.00000
21 -2 8 0 0 -38.46679 -42.52450 408.19830 412.20611 0.00000
/>============================================================================================================================
11 23 7 24 32 26.53989 3.82318 1522.95463 1525.91528 91.14633
11 23 8 33 39 -47.39418 -11.15378 933.22664 938.24658 83.80975
A 12 1 4 40 40 12.20440 -9.30273 -0.18719 15.35031 0.33000
V 11 2101 2 40 40 0.18610 0.52005 -6959.72199 6959.72201 0.00000
A 12 2203 1 55 55 1.49176 3.21717 3111.87748 3111.87950 0.00000
V 11 2 3 55 55 0.53790 4.06071 718.89683 718.90857 0.33000
A 12 2 2 63 63 -0.18295 0.91683 -26.02686 26.04365 0.00000
I 12 21 4 63 63 0.06867 1.47244 -1.63589 2.20203 0.00000
I 12 21 4 63 63 0.83866 0.55106 -0.00105 1.00350 0.00000
I 12 21 4 63 63 0.15807 0.69165 3.58495 3.65448 0.00000
V 11 -2 3 63 63 5.55168 5.20342 697.03246 697.07407 0.33000
A 12 -2 10 79 79 -0.96451 -8.96312 92.48332 92.92164 0.00000
I 12 21 10 79 79 0.41658 -0.71449 10.85051 10.88199 0.00000
I 12 21 10 79 79 -5.85945 -21.97782 219.22387 220.40069 0.00000
I 12 21 10 79 79 -0.46284 -0.42533 11.01848 11.03639 0.00000
I 12 21 10 79 79 0.09624 -0.69310 1.02965 1.24492 0.00000
I 12 21 9 79 79 0.39269 -0.56405 16.27404 16.28854 0.00000
I 12 21 9 79 79 0.01631 0.46283 5.60854 5.62762 0.00000
I 12 21 9 79 79 1.26115 2.52414 78.90045 78.95089 0.00000
V 11 2 9 79 79 31.64372 34.17411 1087.56578 1088.56260 0.00000
A 12 -2 12 98 98 -22.38209 -23.42853 227.03279 229.33326 0.00000
I 12 21 12 98 98 -14.17796 -16.83034 160.14278 161.64772 0.00000
I 12 21 11 98 98 -1.29177 -1.80831 22.09110 22.20260 0.00000
I 12 21 11 98 98 0.35262 0.22265 3.14256 3.17011 0.00000
I 12 21 11 98 98 -7.41806 9.92578 205.88889 206.26145 0.00000
I 12 21 11 98 98 0.04663 -0.05765 1.55173 1.55351 0.00000
V 11 2 11 98 98 -2.52354 20.82262 313.37678 314.07795 0.00000
/>============================================================================================================================
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1 22 203 0 0 -0.12692 -0.15641 0.91694 0.93881 0.00000
1 22 203 0 0 -0.50215 -0.62197 5.11554 5.17762 0.00000
1 22 212 0 0 -0.21831 0.62747 13.31541 13.33197 0.00000
1 22 212 0 0 -0.16690 0.62270 10.65404 10.67353 0.00000
1 211 215 0 0 -0.08531 0.32327 5.22522 5.23777 0.13957
1 -211 215 0 0 -0.78808 3.45912 47.57039 47.70270 0.13957
1 130 216 0 0 -0.77593 4.25463 69.36082 69.49730 0.49767
1 22 217 0 0 -0.02515 1.30409 29.14133 29.17051 0.00000
1 22 217 0 0 -0.03740 0.11095 2.22281 2.22590 0.00000
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1 211 220 0 0 0.65424 -0.32241 0.05028 0.74431 0.13957
1 211 223 0 0 0.15290 0.18718 -33.62161 33.62276 0.13957
1 -211 223 0 0 0.49514 -0.04664 -33.99001 33.99394 0.13957
1 22 236 0 0 0.27249 0.15826 -0.02227 0.31590 0.00000
1 22 236 0 0 0.11983 0.19590 0.00797 0.22978 0.00000
1 22 237 0 0 -0.03001 -0.01643 0.02469 0.04219 0.00000
1 22 237 0 0 0.04109 -0.03271 -0.11881 0.12990 0.00000
1 -211 238 0 0 -0.18989 -0.02314 2.87881 2.88854 0.13957
1 211 238 0 0 0.11391 -0.24514 7.17782 7.18426 0.13957
1 -211 255 0 0 5.80733 6.07120 204.03109 204.20404 0.13957
1 211 255 0 0 0.80957 0.78183 29.52844 29.55021 0.13957
/>============================================================================================================================
p; sum charge: 2.00 sum momentum and inv. mass: 0.00000 0.00000 0.00000 14000.00000 14000.00000

Question information

Language:: English Edit question

Status:: Answered

For:: MadGraph5_aMC@NLO Edit question

Assignee:: Pavel Demin Edit question

Last query:: 2013-12-09

Last reply:: 2013-12-09

Link existing bug

Revision history for this message

Olivier Mattelaer (olivier-mattelaer) said on 2013-12-09:

Hi Maria,

The lhe format performs some particle clustering in order to simplify the output and being able to make some simple plot.
So this is expected to not have the full information in that output format.

I point this question to Pavel, which may want to add some information.

Cheers,

Olivier

Revision history for this message

maria hoffmann (maria-hoffmann) said on 2013-12-09:

Hi Olivier,

Thank you for your fast reply.

I was interested in having the association between the quarks on generator level and the jets created in the fragmentation process. When I examine the generated events from the pgs process that are contained in another ntuple (pgs_events.root) (which contains kinematical information on particle level) I miss the association between the truth and the final particles. Is there a way to solve this problem? Or is it possible to add the particles after the fragmentation process to the pythia output file?

Thanks again

Cheers,
Maria

Revision history for this message

Olivier Mattelaer (olivier-mattelaer) said on 2013-12-09:

No idea on that.

I hope that Pavel can help you with that.

Cheers,

Olivier

PS: Note that PGS is officially not supported by their author, so I would suggest to use Delphes instead.

On Dec 9, 2013, at 10:26 AM, maria hoffmann <email address hidden> wrote:

> Question #240500 on MadGraph5 changed:
> https://answers.launchpad.net/madgraph5/+question/240500
>
> maria hoffmann posted a new comment:
> Hi Olivier,
>
> Thank you for your fast reply.
>
> I was interested in having the association between the quarks on
> generator level and the jets created in the fragmentation process. When
> I examine the generated events from the pgs process that are contained
> in another ntuple (pgs_events.root) (which contains kinematical
> information on particle level) I miss the association between the truth
> and the final particles. Is there a way to solve this problem? Or is it
> possible to add the particles after the fragmentation process to the
> pythia output file?
>
> Thanks again
>
> Cheers,
> Maria
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Revision history for this message

Pavel Demin (pavel-demin) said on 2013-12-09:

Hi Maria,

Pythia also outputs a stdhep file (pythia_events.hep). It should contain all the particles. You can convert this file to root using Delphes or ExRootAnalysis.

In Delphes, the final "reconstructed" particles contain links to the truth particles. Delphes' root file description is available at

https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/RootTreeDescription

Cheers,

Pavel