Jet Radiation in SUSY events
People
- Johan Alwall
- Simon de Visscher
- Fabio Maltoni
Aim of the project
We study QCD radiation in SUSY events, such as gluino-gluino, stop-stop, stop-gluino processes. We use the MLM matching and verify/improve the results of Tilman, David and Peter, and in particular we investigate whether the extra hard jets in SUSY events are well described by the parton-shower, as it is usually claimed, or if matching gives a better description. We also study the matching in heavy tops events as a reference and the SM background needed in these kind of analysis. The SM samples will be used also for other applications.
Tools
- Madgraph/MadEvent v4 : SUSY and matching
- MadMatchChecker
Work
We have identified two phases:
- MC samples generation and validation
- Physics results and paper writeup
MC samples generation and validation
The strategy here is to first generate samples at the after-showering level to perform the validation. Once all samples are validated, we'll do the full Pythia-PGS simulation.
Generation
Standard Model Samples (Simon)
To get a faster generation we:
- define a new model (smzerobmass), where the bmass is set to "Zero" in the particles.dat. This optimizes the flavor sum
- We don't decay the Z, W+,W-, and tops. We'll let these particles be decayed by Pythia. In doing this we loose spin correlations, which, however are irrelevant for the multi-jet samples for this type of studies.
- Not to generate the single particle samples for Z and W. These have a negligible impact on the multi-jet
configurations we are interested in.
- In Pythia, we consider only decays of W into leptons (e, mu and tau) and also into neutrinos for Z.
SUSY and SM Samples
Process | Webpage | section(s) | LHE (on disks) | Pythia | MC | PGS |
1. gogo at 607 GeV (sps1a) | n/a | all | ok | ok | ok | |
1a. SC 1 | n/a | 4 | ok | ok | n/a | |
1b. SC 2 | n/a | 4 | ok | n/a | ||
1c. SC 3 | n/a | 4 | ok | n/a | ||
1d. SC 4 | n/a | 4 | ok | n/a | ||
1e. QCUT x 2 | n/a | 3.1 | ok | n/a | ||
2. gogo at 607 GeV with xqcut and QCUT / 2 | here | 3.1 | n/a | |||
3. gogo at 607 GeV with scales divided by 2 | here | 3 | ok | n/a | ||
4. gogo at 607 GeV with scales multiplied by 2 | here | 3 | ok | n/a | ||
5. gogo at 300 GeV | 4 | ok | ok | ok | n/a | |
6. gogo at 1200 GeV | 4 | ok | ok | ok | n/a | |
7. sqsq at sps1a | n/a | 4,5 | ok | |||
8. sqgo at sps1a | n/a | 4,5 | ok | |||
9. ulul at 607 GeV | here | 3,4 | ok | ok | n/a | |
10. ulul at 607 GeV with scales divided by 2 | here | 3 | ok | ok | ok | n/a |
11. ulul at 607 GeV with scales multiplied by 2 | here | 3 | ok | ok | ok | n/a |
12. ululbar at 607 GeV | here | 3,4 | ok | ok | ok | n/a |
13. ululbar at 607 GeV with scales divided by 2 | here | 3 | ok | ok | ok | n/a |
14. ululbar at 607 GeV with scales multiplied by 2 | here | 3 | ok | ok | ok | n/a |
15. ttbar | n/a | 3,5 | ok | ok | ok | |
15a. QCUT x 2 | n/a | 3,5 | ok | n/a | ||
16. ttbar with xqcut and QCUT / 2 | n/a | 3.1 | n/a | |||
17. ttbar with scales divided by 2 | here | 3 | ok | ok | ok | n/a |
18. ttbar with scales multiplied by 2 | here | 3 | ok | ok | ok | n/a |
19. W+4 jets biaised | n/a | 5 | ok | |||
20. W+3 jets biaised | here | 5 | ok | |||
21. Z+4 jets biaised | n/a | 5 | ok |
Physics results and paper writeup
Plots for the paper
Explanation of notation:
- 4x2 runs means 4 unmatched, 4 matched runs with the different shower params
- 4 params means with the 4 different shower params
- decay jet #s means number of jets from decays
- jet numbers means plot of number of jets above (say) 50 GeV in the events
Figure | section | Process(es) | Description | Done (plan) | plot |
1 | 2 | n/a | Feynman diagrams illustrating resonance double counting (3 plots) | done | |
2 | 3.1 | 1,1e,2,15,15a,16 | Standard validation plots: diff. jet rates 0,1,2 with QCUT, x2, /2 for pT- and Q2-ordered showers, for gogo and ttbar (4x3x3 plots) | ? | |
3a | 3.2 | 15 (4x2 runs),16,17 | pT of 1st and 2nd extra jet in ttbar, unmatched and matched dep on shower params, scale dep. for matched (4 plots) | 6-7/08 | Pt_ttbar.eps |
3b | 3.2 | 1 (4x2 runs),3,4 | pT of 1st and 2nd extra jet in gogo, unmatched and matched dep on shower params, scale dep. for matched (4 plots) | 8/08? | Pt_gogo.eps |
4(7) | 3.3 | 1,9,12 | HTred and pTs, matched for gogo, ulul and ulul* 600 GeV (3 plots) | 11/08 | Htred.eps |
5(6) | 3.3 | 1,5,6 | pT of 1st-2nd extra jet and HTred, matched for gogo at 300, 600, 1200 GeV (2x3 plots) | 11/08 | pt_300_600_1200.eps |
6a(8) | 4 | 1a (4x2 runs) | HT(n),n=3,4,5(?) matched for gogo with decay jet #s, ETmiss unmatched and matched for sc. 1 (4 plots) | 6-7/08 | htcontrib-mockup.eps |
6b(9) | 4 | 1b (4x2 runs) | HT(n),n=3,4,5(?) matched for gogo with decay jet #s, ETmiss unmatched and matched for sc. 2 (4 plots) | htcontrib-sc2.eps | |
7(10) | 4.1 | 1a (4 unm runs),12 | HT(n),n=2,3,4 and jet numbers for unmatched gogo sc. 1 (4 params) and matched ululbar sc. 3 (2x4 plots) | 12/08 | |
8(11) | 4.2 | 1d (4x2 runs) | ETmiss unmatched and matched (1 plot) | 12/08 |
For sec. 5 we should plot the most important quantities used in typical experimental analyses, such as ETmiss, HT(4), and what else? All after PGS.
-- Main.JohanAlwall - 05 Aug 2008
- Pt_ulul.eps: Pt of 1rst and 2nd jet for ulul
- Pt_ululbar.eps: Pt of 1rst and 2nd jet for ululbar
- Htred.eps: Ht red for gogo, ulul and ululbar, as well as Pt of 1rst and second, all with and without matching
- htcontrib-mockup.eps: contrib of jets to Ht scenario 1
- Pt_ttbar.eps: pt for ttbar
- pt_300_600_1200.eps: characteristic of jets for in gogo for go mass=300, 600 and 1200 GeV
- Pt_gogo.eps: pt of the 1rst and 2nd jet for gogo (with ME and PS)
- Pt_ulul.eps: Pt of two leading jets for ulul
- Pt_ululbar.eps: pt of leading jets for ululbar
- Pt_ttbar.eps: Pt_ttbar.eps
- Pt_ulul.eps: Pt_ulul.eps
- Pt_ululbar.eps: Pt_ululbar.eps
- Pt_ulul.eps: Pt_ulul.eps
- pt_300_600_1200.eps: pt_300_600_1200.eps
- htcontrib-sc2.eps: preliminary plot showing the contribution of decay jets to Ht and MET for scenario2
Attachments (33)
- Ratio.jpg (78.6 KB ) - added by 13 years ago.
- Htred.eps (77.0 KB ) - added by 13 years ago.
- GoGo.gif (805.1 KB ) - added by 13 years ago.
- Report_wplus.ps (1.1 MB ) - added by 13 years ago.
- latex64262593213e20a3369ac4d19816d8cf.png (282 bytes ) - added by 13 years ago.
- Pt_ulul.eps (25.1 KB ) - added by 13 years ago.
- wp.gif (1.6 MB ) - added by 13 years ago.
- latexc360c353750b0160e670a4fd5b152922.png (272 bytes ) - added by 13 years ago.
- ReportWminus.ps (548.6 KB ) - added by 13 years ago.
- Report_gogo_600_ps.gz (309.9 KB ) - added by 13 years ago.
- latexe7a87b25a3202159f7ca82de0541c522.png (267 bytes ) - added by 13 years ago.
- Pt_ttbar.eps (27.0 KB ) - added by 13 years ago.
- ReportWplus.ps (549.3 KB ) - added by 13 years ago.
- Pt_gogo.eps (28.6 KB ) - added by 13 years ago.
- latex80a8d5ffd2f7f5123ad335a76767093c.png (238 bytes ) - added by 13 years ago.
- latex32d5e2e9364a68c1aa803543597c9c6d.png (286 bytes ) - added by 13 years ago.
- sqGo.gif (194.5 KB ) - added by 13 years ago.
- GoGo2.gif (805.1 KB ) - added by 13 years ago.
- ttbar.gif (225.1 KB ) - added by 13 years ago.
- Report_Zjets.pdf (147.8 KB ) - added by 13 years ago.
- DJR_comp_11_30_60_80.jpg (61.6 KB ) - added by 13 years ago.
- htcontrib-mockup.eps (36.9 KB ) - added by 13 years ago.
- latex0e4e461c7a77fc9e47ee80f4581a02b9.png (240 bytes ) - added by 13 years ago.
- Pt_ululbar.eps (25.6 KB ) - added by 13 years ago.
- Report.ps (548.6 KB ) - added by 13 years ago.
- MatchChecker.tar.gz (583.5 KB ) - added by 13 years ago.
- Report.ps.gz (1.7 MB ) - added by 13 years ago.
- sqsq.gif (225.1 KB ) - added by 13 years ago.
- htcontrib-sc2.eps (35.6 KB ) - added by 13 years ago.
- latex58c542b29bfc12b11ea645844032627b.png (200 bytes ) - added by 13 years ago.
- Report_tt350.ps (2.1 MB ) - added by 13 years ago.
- Report_ttbar.ps.gz (1.7 MB ) - added by 13 years ago.
- pt_300_600_1200.eps (64.0 KB ) - added by 13 years ago.