1 / 11

Photon(s)+X Group: HERWIG vs. MadGraph

Photon(s)+X Group: HERWIG vs. MadGraph. Osamu Jinnouchi (Tokyo Tech), Fernando Monticelli (La Plate), Bruce Schumm (SCIPP), Harnan Wahlberg (La Plata) Incidental slides for the discussion of whether the Photon+X group should be asked to migrate to MadGraph for 2016 analyses.

Download Presentation

Photon(s)+X Group: HERWIG vs. MadGraph

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Photon(s)+X Group: HERWIG vs. MadGraph Osamu Jinnouchi (Tokyo Tech), Fernando Monticelli (La Plate), Bruce Schumm (SCIPP), Harnan Wahlberg (La Plata) Incidental slides for the discussion of whether the Photon+X group should be asked to migrate to MadGraph for 2016 analyses

  2. Unequivocal: the Photon+X group is committed to moving to MadGraphas long as it remains the recommendation of the SUSY group. • Osamu (supported by Fernando) has put significant time into the transition for diphotons; will continue to do so • La Plata has committed a student to the transition for models associated with photon+jets, photon+lepton However, the Photon+X group would prefer to use HERWIG for 2016 analyses (Diphoton strong and EW production; Photon+jets strong production). Why?

  3. Photons+X: MadGraph vs. HERWIG • 13.3 fb-1 result (ICHEP) done w/ strong-production HERWIG signal model • Existing HERWIG grid only needs small extension for 40 fb-1 • Diphoton analysis has shown adequate understanding of HERWIGMadGraph for strong production gluino-bino model • But needs to be confirmed with generator-level study for gluino-bino/higgsino model  Doing study will cause some delay; regeneration of MC “unnecessary”

  4. Diphotons: MadGraph vs. HERWIG • 3.2 fb-1 result made use of HERWIG for gluino/bino model • When setting up analysis, we designed the HERWIG grid for ~100 fb-1; was a “feature” of our generation request • Subsequently we have achieved adequate understanding of gluino/bino model in MadGraph (Osamu) and submitted focus points • But no physics need to switch from HERWIG for strong prod. • EW model (Wino/bino) not understood; have worked on it for several months (see below); experts are not yet certain why MadGraph is not working (Emma Kuwertz)

  5. Details on Diphoton wino/bino EW model problem (Slides from Osamu)

  6. Conference Note public in early January 2014: Search for Supersymmetry in Diphoton Events with Large Missing Transverse Momentum in 8 TeV pp Collision Data with the ATLAS Detector ATLAS-CONF-2014-001 Final result in preparation

  7. MadGraph Wino-bino sample (mw = 1000; mB = 100) Next slide: Makes no difference what wino state is being produced (chargino, neutralino):

  8. A little more illumination: First three processes are 0-jet; second three are 1-jet; third three are 2-jet Shown to experts (Emma); not clear why this is happening. Doesn’t appear to be our implementation.

  9. Summary of Options • Use HERWIG: gluino/bino grid done; straightforward to extend gluino/higgsino-bino grid and generate wino/bino grid (our request) • Use Madgraph: Regenerate “perfectly fine” gluino-bino grid and most of gluino/higgsino-bino grid; some delay for gluino/higgsino-bino grid, indefinite time delay for wino/bino grid • Use MadGraph, but go against recommendation and use only 1-jet for wino/bino grid  MAY save time if 1-jet deemed to be adequate (what is standard? If HERWIG then odd to move away from it). Might that defeat any purpose of moving to MadGraph anyway?

More Related