1. Responsibles: Jon Butterworth (UCL), Claire Gwenlan (Oxford), Daniela Rebuzzi (Pavia, INFN) ATLAS MC Validation Meeting, 24 May 2011 HERWIG validation report Today: validation for MC11 ( 16.6.5.Y, AUET2-LO** tune, HERWIG 6.520 ) (SM validation: D. Rebuzzi; SUSY validation: C. Gwenlan)

2. Fortran HERWIG validation AIM Validation of athena 16.6.5.Y ( including MC10JobOptions to MC11JobOptions migration, change to new evgen transform Generate_trf.py, HERWIG version update and new AUET2-LO** tune ) for MC11 production Check impact of new “AUET2-LO**” tune for Herwig/Jimmy –details documented in ATL-PHYS-PUB-2011-008 1 validation samples 1.15.6.14.7, MC10JobOptions, AUET1 tune (Baseline MC10 sample) 2.16.6.5.3, MC11JobOptions, AUET1 tune [ checking athena and HW version updates only ] 3.16.6.5.3, MC11JobOptions, AUET2-LO** tune Conclusion : no problematic issues observed NB HERWIG version updated to 6.520 for MC11 [ majority of updates in 6.520 already in our patches for 6.510 ] NB HERWIG version updated to 6.520 for MC11 [ majority of updates in 6.520 already in our patches for 6.510 ]

3. Validation SampleBs (50k events) –mc10_valid.105403.SU3_jimmy_susy.recon.AOD.e787_a124 (MC10JOs, 15.6.14.7, AUET1 tune) –private samples (MC11JOs, 16.6.5.3, HW 6.520, AUET1 tune) –mc11_valid.105403.SU3_jimmy_susy.recon.AOD.e789_a124 ( MC11JOs, 16.6.5.3, HW 6.520, AUET2 ) HERWIG SUSY validation example: dilepton mass (OSSF) 2 SUSY validation: all distributions looks sensible and within expectations ( one small issue I would like to understand a bit better – see later ) ratio of black/red

4. Anti-Kt4 truth jets number of events MET electrons HERWIG SUSY validation 3 Some more examples (further plots in extras) – look OK

5. number of events HERWIG SUSY validation 4 Possibly some observable difference in e.g. jet multiplicity Trend appears more to do with athena/HERWIG update than due to PDF/tune change i.e. green and black, run in same athena version but with different tunes, look similar pT > 20GeV, |eta|<5 Anti-Kt4

6. Summary validation status: 16.6.5.3 (MC11JobOptions) checked against baseline of 15.6.14.7 (MC10JobOptions) –Log files visually checked to ensure correct parameter settings ✔ –Distributions look sensible given new PDF/tune (and HERWIG version) AUET2-LO** tune vs AUET1-LO* (using 16.6.5.3; MC11JobOptions) –Some differences observed in e.g. jet multiplicities – appears to be to do with (athena/)HERWIG update rather than tune (differences are likely understandable; will perform some more checks to pin down in next couple of days) 5

7. 6 Extras

8. config tags: 1. e787 (MC10 JOs, 15.6.14.7, AUET1-LO* tune) 2. private samples (MC11 JOs, 16.6.5.3, AUET1-LO* tune) 3. e789 (MC11 JOs, 16.6.5.3, AUET2-LO** tune) 28 July'08 SampleB plots HERWIG SUSY validation (cont.) 7 using Evgen_trf.py (r15) or Generate_trf.py (r16) @ 7TeV (followed by csc_addTruthJetMet_trf.py)

9. number of events MET quantities HERWIG SUSY validation 8 ratios of black/red

10. HERWIG SUSY validation electron quantities number of events 9

11. HERWIG SUSY validation electron quantities 10 ratios of black/red

12. HERWIG SUSY validation muon quantities number of events 11

13. HERWIG SUSY validation 12 muon quantities ratios of black/red

14. HERWIG SUSY validation photon quantities number of events 13

15. HERWIG SUSY validation 14 photon quantities ratios of black/red

16. HERWIG SUSY validation dilepton masses number of events OSSF electrons OSSF elecs+muons OSSF muons SSSF elecs+muons 15

17. HERWIG SUSY validation 16 dilepton masses ratios of black/red

18. HERWIG SUSY validation jets quantities: anti-kt4 number of events 17 pT > 20GeV, |eta|<5

19. HERWIG SUSY validation 18 jets quantities: anti-kt4 ratios of black/red

20. HERWIG SUSY validation jets quantities: cone4 number of events 19 pT > 20GeV, |eta|<5

21. HERWIG SUSY validation 20 jets quantities: cone4 ratios of black/red

22. HERWIG SUSY validation SUSY “4-jet, 0-lepton” analysis (anti-kt4 jets) number of events 21

23. HERWIG SUSY validation 22 SUSY “4-jet, 0-lepton” analysis (anti-kt4 jets) ratios of black/red